CVE-2022-49295 (GCVE-0-2022-49295)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:01 – Updated: 2025-10-29 10:49
VLAI?
Title
nbd: call genl_unregister_family() first in nbd_cleanup()
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: call genl_unregister_family() first in nbd_cleanup() Otherwise there may be race between module removal and the handling of netlink command, which can lead to the oops as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000098 Oops: 0002 [#1] SMP PTI CPU: 1 PID: 31299 Comm: nbd-client Tainted: G E 5.14.0-rc4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:down_write+0x1a/0x50 Call Trace: start_creating+0x89/0x130 debugfs_create_dir+0x1b/0x130 nbd_start_device+0x13d/0x390 [nbd] nbd_genl_connect+0x42f/0x748 [nbd] genl_family_rcv_msg_doit.isra.0+0xec/0x150 genl_rcv_msg+0xe5/0x1e0 netlink_rcv_skb+0x55/0x100 genl_rcv+0x29/0x40 netlink_unicast+0x1a8/0x250 netlink_sendmsg+0x21b/0x430 ____sys_sendmsg+0x2a4/0x2d0 ___sys_sendmsg+0x81/0xc0 __sys_sendmsg+0x62/0xb0 __x64_sys_sendmsg+0x1f/0x30 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae Modules linked in: nbd(E-)
Severity ?
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 8a1435c862ea09b06be7acda325128dc08458e25 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 1be608e1ee1f222464b2856bda9b85ab5184a33e (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < c0868f6e728c3c28bef0e8bee89d2daf86a8bbca (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < cbeafa7a79d08ecdb55f8f1d41a11323d0f709db (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 6f505bbb8063fd3a238a4239d2d8c165e5279f6f (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 3d5da1ffba3388c2ae2e6c598855a4d887d3bf79 (git)
Affected: e46c7287b1c27683a8e30ca825fb98e2b97f1099 , < 06c4da89c24e7023ea448cadf8e9daf06a0aae6e (git)
Create a notification for this product.
    Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.122 , ≤ 5.10.* (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"unaffected\", \"version\": \"5.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/block/nbd.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8a1435c862ea09b06be7acda325128dc08458e25\"}, {\"url\": \"https://git.kernel.org/stable/c/013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c\"}, {\"url\": \"https://git.kernel.org/stable/c/1be608e1ee1f222464b2856bda9b85ab5184a33e\"}, {\"url\": \"https://git.kernel.org/stable/c/c0868f6e728c3c28bef0e8bee89d2daf86a8bbca\"}, {\"url\": \"https://git.kernel.org/stable/c/cbeafa7a79d08ecdb55f8f1d41a11323d0f709db\"}, {\"url\": \"https://git.kernel.org/stable/c/6f505bbb8063fd3a238a4239d2d8c165e5279f6f\"}, {\"url\": \"https://git.kernel.org/stable/c/3d5da1ffba3388c2ae2e6c598855a4d887d3bf79\"}, {\"url\": \"https://git.kernel.org/stable/c/06c4da89c24e7023ea448cadf8e9daf06a0aae6e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnbd: call genl_unregister_family() first in nbd_cleanup()\\n\\nOtherwise there may be race between module removal and the handling of\\nnetlink command, which can lead to the oops as shown below:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000098\\n  Oops: 0002 [#1] SMP PTI\\n  CPU: 1 PID: 31299 Comm: nbd-client Tainted: G            E     5.14.0-rc4\\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\\n  RIP: 0010:down_write+0x1a/0x50\\n  Call Trace:\\n   start_creating+0x89/0x130\\n   debugfs_create_dir+0x1b/0x130\\n   nbd_start_device+0x13d/0x390 [nbd]\\n   nbd_genl_connect+0x42f/0x748 [nbd]\\n   genl_family_rcv_msg_doit.isra.0+0xec/0x150\\n   genl_rcv_msg+0xe5/0x1e0\\n   netlink_rcv_skb+0x55/0x100\\n   genl_rcv+0x29/0x40\\n   netlink_unicast+0x1a8/0x250\\n   netlink_sendmsg+0x21b/0x430\\n   ____sys_sendmsg+0x2a4/0x2d0\\n   ___sys_sendmsg+0x81/0xc0\\n   __sys_sendmsg+0x62/0xb0\\n   __x64_sys_sendmsg+0x1f/0x30\\n   do_syscall_64+0x3b/0xc0\\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\\n  Modules linked in: nbd(E-)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.283\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.247\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.198\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.122\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.47\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.15\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.4\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"4.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-10-29T10:49:58.050Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49295\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-29T10:49:58.050Z\", \"dateReserved\": \"2025-02-26T01:49:39.302Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:01:25.659Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • 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.