CVE-2021-46938 (GCVE-0-2021-46938)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:40 – Updated: 2025-05-04 07:00
VLAI?
Title
dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails
Summary
In the Linux kernel, the following vulnerability has been resolved: dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails When loading a device-mapper table for a request-based mapped device, and the allocation/initialization of the blk_mq_tag_set for the device fails, a following device remove will cause a double free. E.g. (dmesg): device-mapper: core: Cannot initialize queue for request-based dm-mq mapped device device-mapper: ioctl: unable to set up device queue for new table. Unable to handle kernel pointer dereference in virtual kernel address space Failing address: 0305e098835de000 TEID: 0305e098835de803 Fault in home space mode while using kernel ASCE. AS:000000025efe0007 R3:0000000000000024 Oops: 0038 ilc:3 [#1] SMP Modules linked in: ... lots of modules ... Supported: Yes, External CPU: 0 PID: 7348 Comm: multipathd Kdump: loaded Tainted: G W X 5.3.18-53-default #1 SLE15-SP3 Hardware name: IBM 8561 T01 7I2 (LPAR) Krnl PSW : 0704e00180000000 000000025e368eca (kfree+0x42/0x330) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 Krnl GPRS: 000000000000004a 000000025efe5230 c1773200d779968d 0000000000000000 000000025e520270 000000025e8d1b40 0000000000000003 00000007aae10000 000000025e5202a2 0000000000000001 c1773200d779968d 0305e098835de640 00000007a8170000 000003ff80138650 000000025e5202a2 000003e00396faa8 Krnl Code: 000000025e368eb8: c4180041e100 lgrl %r1,25eba50b8 000000025e368ebe: ecba06b93a55 risbg %r11,%r10,6,185,58 #000000025e368ec4: e3b010000008 ag %r11,0(%r1) >000000025e368eca: e310b0080004 lg %r1,8(%r11) 000000025e368ed0: a7110001 tmll %r1,1 000000025e368ed4: a7740129 brc 7,25e369126 000000025e368ed8: e320b0080004 lg %r2,8(%r11) 000000025e368ede: b904001b lgr %r1,%r11 Call Trace: [<000000025e368eca>] kfree+0x42/0x330 [<000000025e5202a2>] blk_mq_free_tag_set+0x72/0xb8 [<000003ff801316a8>] dm_mq_cleanup_mapped_device+0x38/0x50 [dm_mod] [<000003ff80120082>] free_dev+0x52/0xd0 [dm_mod] [<000003ff801233f0>] __dm_destroy+0x150/0x1d0 [dm_mod] [<000003ff8012bb9a>] dev_remove+0x162/0x1c0 [dm_mod] [<000003ff8012a988>] ctl_ioctl+0x198/0x478 [dm_mod] [<000003ff8012ac8a>] dm_ctl_ioctl+0x22/0x38 [dm_mod] [<000000025e3b11ee>] ksys_ioctl+0xbe/0xe0 [<000000025e3b127a>] __s390x_sys_ioctl+0x2a/0x40 [<000000025e8c15ac>] system_call+0xd8/0x2c8 Last Breaking-Event-Address: [<000000025e52029c>] blk_mq_free_tag_set+0x6c/0xb8 Kernel panic - not syncing: Fatal exception: panic_on_oops When allocation/initialization of the blk_mq_tag_set fails in dm_mq_init_request_queue(), it is uninitialized/freed, but the pointer is not reset to NULL; so when dev_remove() later gets into dm_mq_cleanup_mapped_device() it sees the pointer and tries to uninitialize and free it again. Fix this by setting the pointer to NULL in dm_mq_init_request_queue() error-handling. Also set it to NULL in dm_mq_cleanup_mapped_device().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < 8ae0185255eaf05bd66f4215c81e99bf01140fd9 (git)
Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < b42c0a33dfdd451d9be62dd5de58c39f2750b6e3 (git)
Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < 772b9f59657665af3b68d24d12b9d172d31f0dfb (git)
Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < a992a283c0b77d0a7c2c348add0e6a21fb1dab67 (git)
Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < 1cb02dc76f4c0a2749a02b26469512d6984252e9 (git)
Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < 6086f957416a6e87236c06079fcaba7a3998aeca (git)
Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < d757bf4c69cda3c3ab7f775dfabbf5a80e2f6f9d (git)
Affected: 1c357a1e86a4227a6b6059f2de118ae47659cebc , < 8e947c8f4a5620df77e43c9c75310dc510250166 (git)
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    Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 4.9.269 , ≤ 4.9.* (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.118 , ≤ 5.4.* (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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the device\\nfails, a following device remove will cause a double free.\\n\\nE.g. (dmesg):\\n  device-mapper: core: Cannot initialize queue for request-based dm-mq mapped device\\n  device-mapper: ioctl: unable to set up device queue for new table.\\n  Unable to handle kernel pointer dereference in virtual kernel address space\\n  Failing address: 0305e098835de000 TEID: 0305e098835de803\\n  Fault in home space mode while using kernel ASCE.\\n  AS:000000025efe0007 R3:0000000000000024\\n  Oops: 0038 ilc:3 [#1] SMP\\n  Modules linked in: ... lots of modules ...\\n  Supported: Yes, External\\n  CPU: 0 PID: 7348 Comm: multipathd Kdump: loaded Tainted: G        W      X    5.3.18-53-default #1 SLE15-SP3\\n  Hardware name: IBM 8561 T01 7I2 (LPAR)\\n  Krnl PSW : 0704e00180000000 000000025e368eca (kfree+0x42/0x330)\\n             R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3\\n  Krnl GPRS: 000000000000004a 000000025efe5230 c1773200d779968d 0000000000000000\\n             000000025e520270 000000025e8d1b40 0000000000000003 00000007aae10000\\n             000000025e5202a2 0000000000000001 c1773200d779968d 0305e098835de640\\n             00000007a8170000 000003ff80138650 000000025e5202a2 000003e00396faa8\\n  Krnl Code: 000000025e368eb8: c4180041e100       lgrl    %r1,25eba50b8\\n             000000025e368ebe: ecba06b93a55       risbg   %r11,%r10,6,185,58\\n            #000000025e368ec4: e3b010000008       ag      %r11,0(%r1)\\n            \u003e000000025e368eca: e310b0080004       lg      %r1,8(%r11)\\n             000000025e368ed0: a7110001           tmll    %r1,1\\n             000000025e368ed4: a7740129           brc     7,25e369126\\n             000000025e368ed8: e320b0080004       lg      %r2,8(%r11)\\n             000000025e368ede: b904001b           lgr     %r1,%r11\\n  Call Trace:\\n   [\u003c000000025e368eca\u003e] kfree+0x42/0x330\\n   [\u003c000000025e5202a2\u003e] blk_mq_free_tag_set+0x72/0xb8\\n   [\u003c000003ff801316a8\u003e] dm_mq_cleanup_mapped_device+0x38/0x50 [dm_mod]\\n   [\u003c000003ff80120082\u003e] free_dev+0x52/0xd0 [dm_mod]\\n   [\u003c000003ff801233f0\u003e] __dm_destroy+0x150/0x1d0 [dm_mod]\\n   [\u003c000003ff8012bb9a\u003e] dev_remove+0x162/0x1c0 [dm_mod]\\n   [\u003c000003ff8012a988\u003e] ctl_ioctl+0x198/0x478 [dm_mod]\\n   [\u003c000003ff8012ac8a\u003e] dm_ctl_ioctl+0x22/0x38 [dm_mod]\\n   [\u003c000000025e3b11ee\u003e] ksys_ioctl+0xbe/0xe0\\n   [\u003c000000025e3b127a\u003e] __s390x_sys_ioctl+0x2a/0x40\\n   [\u003c000000025e8c15ac\u003e] system_call+0xd8/0x2c8\\n  Last Breaking-Event-Address:\\n   [\u003c000000025e52029c\u003e] blk_mq_free_tag_set+0x6c/0xb8\\n  Kernel panic - not syncing: Fatal exception: panic_on_oops\\n\\nWhen allocation/initialization of the blk_mq_tag_set fails in\\ndm_mq_init_request_queue(), it is uninitialized/freed, but the pointer\\nis not reset to NULL; so when dev_remove() later gets into\\ndm_mq_cleanup_mapped_device() it sees the pointer and tries to\\nuninitialize and free it again.\\n\\nFix this by setting the pointer to NULL in dm_mq_init_request_queue()\\nerror-handling. Also set it to NULL in dm_mq_cleanup_mapped_device().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.269\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.118\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.36\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.20\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.3\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"4.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:00:42.785Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46938\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:00:42.785Z\", \"dateReserved\": \"2024-02-25T13:45:52.721Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:40:26.850Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.