CVE-2023-52973 (GCVE-0-2023-52973)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:43 – Updated: 2025-05-04 07:46
VLAI?
Title
vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF After a call to console_unlock() in vcs_read() the vc_data struct can be freed by vc_deallocate(). Because of that, the struct vc_data pointer load must be done at the top of while loop in vcs_read() to avoid a UAF when vcs_size() is called. Syzkaller reported a UAF in vcs_size(). BUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215) Read of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537 CPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1 Hardware name: Red Hat KVM, BIOS 1.15.0-2.module Call Trace: <TASK> __asan_report_load4_noabort (mm/kasan/report_generic.c:350) vcs_size (drivers/tty/vt/vc_screen.c:215) vcs_read (drivers/tty/vt/vc_screen.c:415) vfs_read (fs/read_write.c:468 fs/read_write.c:450) ... </TASK> Allocated by task 1191: ... kmalloc_trace (mm/slab_common.c:1069) vc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720 drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108) con_install (drivers/tty/vt/vt.c:3383) tty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413 drivers/tty/tty_io.c:1390) tty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126) chrdev_open (fs/char_dev.c:415) do_dentry_open (fs/open.c:883) vfs_open (fs/open.c:1014) ... Freed by task 1548: ... kfree (mm/slab_common.c:1021) vc_port_destruct (drivers/tty/vt/vt.c:1094) tty_port_destructor (drivers/tty/tty_port.c:296) tty_port_put (drivers/tty/tty_port.c:312) vt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2)) vt_ioctl (drivers/tty/vt/vt_ioctl.c:903) tty_ioctl (drivers/tty/tty_io.c:2776) ... The buggy address belongs to the object at ffff888113747800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 424 bytes inside of 1024-byte region [ffff888113747800, ffff888113747c00) The buggy address belongs to the physical page: page:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113740 head:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 anon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff) raw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Disabling lock debugging due to kernel taint
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < af79ea9a2443016f64d8fd8d72020cc874f0e066 (git)
Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 6332f52f44b9776568bf3c0b714ddfb0bb175e78 (git)
Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < d0332cbf53dad06a22189cc341391237f4ea6d9f (git)
Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 55515d7d8743b71b80bfe68e89eb9d92630626ab (git)
Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18 (git)
Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 8506f16aae9daf354e3732bcfd447e2a97f023df (git)
Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 226fae124b2dac217ea5436060d623ff3385bc34 (git)
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    Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 4.14.329 , ≤ 4.14.* (semver)
Unaffected: 4.19.273 , ≤ 4.19.* (semver)
Unaffected: 5.4.232 , ≤ 5.4.* (semver)
Unaffected: 5.10.168 , ≤ 5.10.* (semver)
Unaffected: 5.15.93 , ≤ 5.15.* (semver)
Unaffected: 6.1.11 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
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              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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                "timestamp": "2025-03-27T16:59:54.662104Z",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF\n\nAfter a call to console_unlock() in vcs_read() the vc_data struct can be\nfreed by vc_deallocate(). Because of that, the struct vc_data pointer\nload must be done at the top of while loop in vcs_read() to avoid a UAF\nwhen vcs_size() is called.\n\nSyzkaller reported a UAF in vcs_size().\n\nBUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)\nRead of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537\n\nCPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1\nHardware name: Red Hat KVM, BIOS 1.15.0-2.module\nCall Trace:\n  \u003cTASK\u003e\n__asan_report_load4_noabort (mm/kasan/report_generic.c:350)\nvcs_size (drivers/tty/vt/vc_screen.c:215)\nvcs_read (drivers/tty/vt/vc_screen.c:415)\nvfs_read (fs/read_write.c:468 fs/read_write.c:450)\n...\n  \u003c/TASK\u003e\n\nAllocated by task 1191:\n...\nkmalloc_trace (mm/slab_common.c:1069)\nvc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720\n     drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108)\ncon_install (drivers/tty/vt/vt.c:3383)\ntty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413\n     drivers/tty/tty_io.c:1390)\ntty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126)\nchrdev_open (fs/char_dev.c:415)\ndo_dentry_open (fs/open.c:883)\nvfs_open (fs/open.c:1014)\n...\n\nFreed by task 1548:\n...\nkfree (mm/slab_common.c:1021)\nvc_port_destruct (drivers/tty/vt/vt.c:1094)\ntty_port_destructor (drivers/tty/tty_port.c:296)\ntty_port_put (drivers/tty/tty_port.c:312)\nvt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))\nvt_ioctl (drivers/tty/vt/vt_ioctl.c:903)\ntty_ioctl (drivers/tty/tty_io.c:2776)\n...\n\nThe buggy address belongs to the object at ffff888113747800\n  which belongs to the cache kmalloc-1k of size 1024\nThe buggy address is located 424 bytes inside of\n  1024-byte region [ffff888113747800, ffff888113747c00)\n\nThe buggy address belongs to the physical page:\npage:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000\n     index:0x0 pfn:0x113740\nhead:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0\n     compound_pincount:0\nanon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\nraw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001\nraw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n  ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n  ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\u003e ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                                   ^\n  ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n  ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================\nDisabling lock debugging due to kernel taint"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:46:35.811Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/af79ea9a2443016f64d8fd8d72020cc874f0e066"
        },
        {
          "url": "https://git.kernel.org/stable/c/6332f52f44b9776568bf3c0b714ddfb0bb175e78"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0332cbf53dad06a22189cc341391237f4ea6d9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/55515d7d8743b71b80bfe68e89eb9d92630626ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18"
        },
        {
          "url": "https://git.kernel.org/stable/c/8506f16aae9daf354e3732bcfd447e2a97f023df"
        },
        {
          "url": "https://git.kernel.org/stable/c/226fae124b2dac217ea5436060d623ff3385bc34"
        }
      ],
      "title": "vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52973",
    "datePublished": "2025-03-27T16:43:12.756Z",
    "dateReserved": "2025-03-27T16:40:15.737Z",
    "dateUpdated": "2025-05-04T07:46:35.811Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-52973\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-03-27T16:59:54.662104Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-03-27T16:59:55.968Z\"}}], \"cna\": {\"title\": \"vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"af79ea9a2443016f64d8fd8d72020cc874f0e066\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"6332f52f44b9776568bf3c0b714ddfb0bb175e78\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"d0332cbf53dad06a22189cc341391237f4ea6d9f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"55515d7d8743b71b80bfe68e89eb9d92630626ab\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"8506f16aae9daf354e3732bcfd447e2a97f023df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"226fae124b2dac217ea5436060d623ff3385bc34\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/tty/vt/vc_screen.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.38\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.38\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.329\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.273\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.232\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/vt/vc_screen.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/af79ea9a2443016f64d8fd8d72020cc874f0e066\"}, {\"url\": \"https://git.kernel.org/stable/c/6332f52f44b9776568bf3c0b714ddfb0bb175e78\"}, {\"url\": \"https://git.kernel.org/stable/c/d0332cbf53dad06a22189cc341391237f4ea6d9f\"}, {\"url\": \"https://git.kernel.org/stable/c/55515d7d8743b71b80bfe68e89eb9d92630626ab\"}, {\"url\": \"https://git.kernel.org/stable/c/fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18\"}, {\"url\": \"https://git.kernel.org/stable/c/8506f16aae9daf354e3732bcfd447e2a97f023df\"}, {\"url\": \"https://git.kernel.org/stable/c/226fae124b2dac217ea5436060d623ff3385bc34\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF\\n\\nAfter a call to console_unlock() in vcs_read() the vc_data struct can be\\nfreed by vc_deallocate(). Because of that, the struct vc_data pointer\\nload must be done at the top of while loop in vcs_read() to avoid a UAF\\nwhen vcs_size() is called.\\n\\nSyzkaller reported a UAF in vcs_size().\\n\\nBUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)\\nRead of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537\\n\\nCPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1\\nHardware name: Red Hat KVM, BIOS 1.15.0-2.module\\nCall Trace:\\n  \u003cTASK\u003e\\n__asan_report_load4_noabort (mm/kasan/report_generic.c:350)\\nvcs_size (drivers/tty/vt/vc_screen.c:215)\\nvcs_read (drivers/tty/vt/vc_screen.c:415)\\nvfs_read (fs/read_write.c:468 fs/read_write.c:450)\\n...\\n  \u003c/TASK\u003e\\n\\nAllocated by task 1191:\\n...\\nkmalloc_trace (mm/slab_common.c:1069)\\nvc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720\\n     drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108)\\ncon_install (drivers/tty/vt/vt.c:3383)\\ntty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413\\n     drivers/tty/tty_io.c:1390)\\ntty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126)\\nchrdev_open (fs/char_dev.c:415)\\ndo_dentry_open (fs/open.c:883)\\nvfs_open (fs/open.c:1014)\\n...\\n\\nFreed by task 1548:\\n...\\nkfree (mm/slab_common.c:1021)\\nvc_port_destruct (drivers/tty/vt/vt.c:1094)\\ntty_port_destructor (drivers/tty/tty_port.c:296)\\ntty_port_put (drivers/tty/tty_port.c:312)\\nvt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))\\nvt_ioctl (drivers/tty/vt/vt_ioctl.c:903)\\ntty_ioctl (drivers/tty/tty_io.c:2776)\\n...\\n\\nThe buggy address belongs to the object at ffff888113747800\\n  which belongs to the cache kmalloc-1k of size 1024\\nThe buggy address is located 424 bytes inside of\\n  1024-byte region [ffff888113747800, ffff888113747c00)\\n\\nThe buggy address belongs to the physical page:\\npage:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000\\n     index:0x0 pfn:0x113740\\nhead:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0\\n     compound_pincount:0\\nanon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\\nraw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001\\nraw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\\npage dumped because: kasan: bad access detected\\n\\nMemory state around the buggy address:\\n  ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n  ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n\u003e ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n                                   ^\\n  ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n  ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n==================================================================\\nDisabling lock debugging due to kernel taint\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-03-27T16:43:12.756Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52973\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-27T17:08:22.708Z\", \"dateReserved\": \"2025-03-27T16:40:15.737Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-27T16:43:12.756Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.