CVE-2021-47375 (GCVE-0-2021-47375)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2025-05-04 07:09
VLAI?
Title
blktrace: Fix uaf in blk_trace access after removing by sysfs
Summary
In the Linux kernel, the following vulnerability has been resolved: blktrace: Fix uaf in blk_trace access after removing by sysfs There is an use-after-free problem triggered by following process: P1(sda) P2(sdb) echo 0 > /sys/block/sdb/trace/enable blk_trace_remove_queue synchronize_rcu blk_trace_free relay_close rcu_read_lock __blk_add_trace trace_note_tsk (Iterate running_trace_list) relay_close_buf relay_destroy_buf kfree(buf) trace_note(sdb's bt) relay_reserve buf->offset <- nullptr deference (use-after-free) !!! rcu_read_unlock [ 502.714379] BUG: kernel NULL pointer dereference, address: 0000000000000010 [ 502.715260] #PF: supervisor read access in kernel mode [ 502.715903] #PF: error_code(0x0000) - not-present page [ 502.716546] PGD 103984067 P4D 103984067 PUD 17592b067 PMD 0 [ 502.717252] Oops: 0000 [#1] SMP [ 502.720308] RIP: 0010:trace_note.isra.0+0x86/0x360 [ 502.732872] Call Trace: [ 502.733193] __blk_add_trace.cold+0x137/0x1a3 [ 502.733734] blk_add_trace_rq+0x7b/0xd0 [ 502.734207] blk_add_trace_rq_issue+0x54/0xa0 [ 502.734755] blk_mq_start_request+0xde/0x1b0 [ 502.735287] scsi_queue_rq+0x528/0x1140 ... [ 502.742704] sg_new_write.isra.0+0x16e/0x3e0 [ 502.747501] sg_ioctl+0x466/0x1100 Reproduce method: ioctl(/dev/sda, BLKTRACESETUP, blk_user_trace_setup[buf_size=127]) ioctl(/dev/sda, BLKTRACESTART) ioctl(/dev/sdb, BLKTRACESETUP, blk_user_trace_setup[buf_size=127]) ioctl(/dev/sdb, BLKTRACESTART) echo 0 > /sys/block/sdb/trace/enable & // Add delay(mdelay/msleep) before kernel enters blk_trace_free() ioctl$SG_IO(/dev/sda, SG_IO, ...) // Enters trace_note_tsk() after blk_trace_free() returned // Use mdelay in rcu region rather than msleep(which may schedule out) Remove blk_trace from running_list before calling blk_trace_free() by sysfs if blk_trace is at Blktrace_running state.
Severity ?
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < 488da313edf3abea7f7733efe011c96b23740ab5 (git)
Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < dacfd5e4d1142bfb3809aab3634a375f6f373269 (git)
Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < d56171d9360c0170c5c5f8f7e2362a2e999eca40 (git)
Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < 677e362ba807f3aafe6f405c07e0b37244da5222 (git)
Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < ebb8d26d93c3ec3c7576c52a8373a2309423c069 (git)
Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < 3815fe7371d2411ce164281cef40d9fc7b323dee (git)
Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < a5f8e86192612d0183047448d8bbe7918b3f1a26 (git)
Affected: c71a896154119f4ca9e89d6078f5f63ad60ef199 , < 5afedf670caf30a2b5a52da96eb7eac7dee6a9c9 (git)
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    Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 4.4.286 , ≤ 4.4.* (semver)
Unaffected: 4.9.285 , ≤ 4.9.* (semver)
Unaffected: 4.14.249 , ≤ 4.14.* (semver)
Unaffected: 4.19.209 , ≤ 4.19.* (semver)
Unaffected: 5.4.150 , ≤ 5.4.* (semver)
Unaffected: 5.10.70 , ≤ 5.10.* (semver)
Unaffected: 5.14.9 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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\"c71a896154119f4ca9e89d6078f5f63ad60ef199\", \"lessThan\": \"d56171d9360c0170c5c5f8f7e2362a2e999eca40\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c71a896154119f4ca9e89d6078f5f63ad60ef199\", \"lessThan\": \"677e362ba807f3aafe6f405c07e0b37244da5222\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c71a896154119f4ca9e89d6078f5f63ad60ef199\", \"lessThan\": \"ebb8d26d93c3ec3c7576c52a8373a2309423c069\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c71a896154119f4ca9e89d6078f5f63ad60ef199\", \"lessThan\": \"3815fe7371d2411ce164281cef40d9fc7b323dee\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c71a896154119f4ca9e89d6078f5f63ad60ef199\", \"lessThan\": \"a5f8e86192612d0183047448d8bbe7918b3f1a26\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c71a896154119f4ca9e89d6078f5f63ad60ef199\", \"lessThan\": \"5afedf670caf30a2b5a52da96eb7eac7dee6a9c9\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/trace/blktrace.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.30\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.30\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.286\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.249\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.150\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.70\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/trace/blktrace.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/488da313edf3abea7f7733efe011c96b23740ab5\"}, {\"url\": \"https://git.kernel.org/stable/c/dacfd5e4d1142bfb3809aab3634a375f6f373269\"}, {\"url\": \"https://git.kernel.org/stable/c/d56171d9360c0170c5c5f8f7e2362a2e999eca40\"}, {\"url\": \"https://git.kernel.org/stable/c/677e362ba807f3aafe6f405c07e0b37244da5222\"}, {\"url\": \"https://git.kernel.org/stable/c/ebb8d26d93c3ec3c7576c52a8373a2309423c069\"}, {\"url\": \"https://git.kernel.org/stable/c/3815fe7371d2411ce164281cef40d9fc7b323dee\"}, {\"url\": \"https://git.kernel.org/stable/c/a5f8e86192612d0183047448d8bbe7918b3f1a26\"}, {\"url\": \"https://git.kernel.org/stable/c/5afedf670caf30a2b5a52da96eb7eac7dee6a9c9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblktrace: Fix uaf in blk_trace access after removing by sysfs\\n\\nThere is an use-after-free problem triggered by following process:\\n\\n      P1(sda)\\t\\t\\t\\tP2(sdb)\\n\\t\\t\\techo 0 \u003e /sys/block/sdb/trace/enable\\n\\t\\t\\t  blk_trace_remove_queue\\n\\t\\t\\t    synchronize_rcu\\n\\t\\t\\t    blk_trace_free\\n\\t\\t\\t      relay_close\\nrcu_read_lock\\n__blk_add_trace\\n  trace_note_tsk\\n  (Iterate running_trace_list)\\n\\t\\t\\t        relay_close_buf\\n\\t\\t\\t\\t  relay_destroy_buf\\n\\t\\t\\t\\t    kfree(buf)\\n    trace_note(sdb\u0027s bt)\\n      relay_reserve\\n        buf-\u003eoffset \u003c- nullptr deference (use-after-free) !!!\\nrcu_read_unlock\\n\\n[  502.714379] BUG: kernel NULL pointer dereference, address:\\n0000000000000010\\n[  502.715260] #PF: supervisor read access in kernel mode\\n[  502.715903] #PF: error_code(0x0000) - not-present page\\n[  502.716546] PGD 103984067 P4D 103984067 PUD 17592b067 PMD 0\\n[  502.717252] Oops: 0000 [#1] SMP\\n[  502.720308] RIP: 0010:trace_note.isra.0+0x86/0x360\\n[  502.732872] Call Trace:\\n[  502.733193]  __blk_add_trace.cold+0x137/0x1a3\\n[  502.733734]  blk_add_trace_rq+0x7b/0xd0\\n[  502.734207]  blk_add_trace_rq_issue+0x54/0xa0\\n[  502.734755]  blk_mq_start_request+0xde/0x1b0\\n[  502.735287]  scsi_queue_rq+0x528/0x1140\\n...\\n[  502.742704]  sg_new_write.isra.0+0x16e/0x3e0\\n[  502.747501]  sg_ioctl+0x466/0x1100\\n\\nReproduce method:\\n  ioctl(/dev/sda, BLKTRACESETUP, blk_user_trace_setup[buf_size=127])\\n  ioctl(/dev/sda, BLKTRACESTART)\\n  ioctl(/dev/sdb, BLKTRACESETUP, blk_user_trace_setup[buf_size=127])\\n  ioctl(/dev/sdb, BLKTRACESTART)\\n\\n  echo 0 \u003e /sys/block/sdb/trace/enable \u0026\\n  // Add delay(mdelay/msleep) before kernel enters blk_trace_free()\\n\\n  ioctl$SG_IO(/dev/sda, SG_IO, ...)\\n  // Enters trace_note_tsk() after blk_trace_free() returned\\n  // Use mdelay in rcu region rather than msleep(which may schedule out)\\n\\nRemove blk_trace from running_list before calling blk_trace_free() by\\nsysfs if blk_trace is at Blktrace_running state.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.286\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.285\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.249\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.209\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.150\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.70\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.9\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"2.6.30\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:09:38.500Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47375\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:09:38.500Z\", \"dateReserved\": \"2024-05-21T14:58:30.811Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:03:39.090Z\", \"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.