CVE-2026-53062 (GCVE-0-2026-53062)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-28 06:38
VLAI
Title
dm cache policy smq: fix missing locks in invalidating cache blocks
Summary
In the Linux kernel, the following vulnerability has been resolved: dm cache policy smq: fix missing locks in invalidating cache blocks In passthrough mode, the policy invalidate_mapping operation is called simultaneously from multiple workers, thus it should be protected by a lock. Otherwise, we might end up with data races on the allocated blocks counter, or even use-after-free issues with internal data structures when doing concurrent writes. Note that the existing FIXME in smq_invalidate_mapping() doesn't affect passthrough mode since migration tasks don't exist there, but would need attention if supporting fast device shrinking via suspend/resume without target reloading. Reproduce steps: 1. Create a cache device consisting of 1024 cache entries dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 131072 linear /dev/sdc 8192" dmsetup create corig --table "0 262144 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table "0 262144 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" 2. Populate the cache, and record the number of cached blocks fio --name=populate --filename=/dev/mapper/cache --rw=randwrite --bs=4k \ --size=64m --direct=1 nr_cached=$(dmsetup status cache | awk '{split($7, a, "/"); print a[1]}') 3. Reload the cache into passthrough mode dmsetup suspend cache dmsetup reload cache --table "0 262144 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0" dmsetup resume cache 4. Write to the passthrough cache. By setting multiple jobs with I/O size equal to the cache block size, cache blocks are invalidated concurrently from different workers. fio --filename=/dev/mapper/cache --name=test --rw=randwrite --bs=64k \ --direct=1 --numjobs=2 --randrepeat=0 --size=64m 5. Check if demoted matches cached block count. These numbers should match but may differ due to the data race. nr_demoted=$(dmsetup status cache | awk '{print $12}') echo "$nr_cached, $nr_demoted"
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 4991b5a08751e2e82488fb93ae08849b6aea10d9 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < ac5ee99443891bdb161f5539606a66a1b5e72542 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 93627a29d4b66d4a2def938dfb8610cc80ae454b (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < c348ae47d8e65f06429fa41adce9ad986b696766 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 2b62d0611c9af14a16bddf22df2612b4f40eb5a1 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache policy smq: fix missing locks in invalidating cache blocks\n\nIn passthrough mode, the policy invalidate_mapping operation is called\nsimultaneously from multiple workers, thus it should be protected by a\nlock. Otherwise, we might end up with data races on the allocated blocks\ncounter, or even use-after-free issues with internal data structures\nwhen doing concurrent writes.\n\nNote that the existing FIXME in smq_invalidate_mapping() doesn\u0027t affect\npassthrough mode since migration tasks don\u0027t exist there, but would need\nattention if supporting fast device shrinking via suspend/resume without\ntarget reloading.\n\nReproduce steps:\n\n1. Create a cache device consisting of 1024 cache entries\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 262144 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\ndmsetup create cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\n\n2. Populate the cache, and record the number of cached blocks\n\nfio --name=populate --filename=/dev/mapper/cache --rw=randwrite --bs=4k \\\n--size=64m --direct=1\nnr_cached=$(dmsetup status cache | awk \u0027{split($7, a, \"/\"); print a[1]}\u0027)\n\n3. Reload the cache into passthrough mode\n\ndmsetup suspend cache\ndmsetup reload cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0\"\ndmsetup resume cache\n\n4. Write to the passthrough cache. By setting multiple jobs with I/O\n   size equal to the cache block size, cache blocks are invalidated\n   concurrently from different workers.\n\nfio --filename=/dev/mapper/cache --name=test --rw=randwrite --bs=64k \\\n--direct=1 --numjobs=2 --randrepeat=0 --size=64m\n\n5. Check if demoted matches cached block count. These numbers should\n   match but may differ due to the data race.\n\nnr_demoted=$(dmsetup status cache | awk \u0027{print $12}\u0027)\necho \"$nr_cached, $nr_demoted\""
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    "cveId": "CVE-2026-53062",
    "datePublished": "2026-06-24T16:30:06.189Z",
    "dateReserved": "2026-06-09T07:44:35.382Z",
    "dateUpdated": "2026-06-28T06:38:50.387Z",
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      "date": "2026-07-02",
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Otherwise, we might end up with data races on the allocated blocks\\ncounter, or even use-after-free issues with internal data structures\\nwhen doing concurrent writes.\\n\\nNote that the existing FIXME in smq_invalidate_mapping() doesn\u0027t affect\\npassthrough mode since migration tasks don\u0027t exist there, but would need\\nattention if supporting fast device shrinking via suspend/resume without\\ntarget reloading.\\n\\nReproduce steps:\\n\\n1. Create a cache device consisting of 1024 cache entries\\n\\ndmsetup create cmeta --table \\\"0 8192 linear /dev/sdc 0\\\"\\ndmsetup create cdata --table \\\"0 131072 linear /dev/sdc 8192\\\"\\ndmsetup create corig --table \\\"0 262144 linear /dev/sdc 262144\\\"\\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\\ndmsetup create cache --table \\\"0 262144 cache /dev/mapper/cmeta \\\\\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\\\"\\n\\n2. Populate the cache, and record the number of cached blocks\\n\\nfio --name=populate --filename=/dev/mapper/cache --rw=randwrite --bs=4k \\\\\\n--size=64m --direct=1\\nnr_cached=$(dmsetup status cache | awk \u0027{split($7, a, \\\"/\\\"); print a[1]}\u0027)\\n\\n3. Reload the cache into passthrough mode\\n\\ndmsetup suspend cache\\ndmsetup reload cache --table \\\"0 262144 cache /dev/mapper/cmeta \\\\\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0\\\"\\ndmsetup resume cache\\n\\n4. Write to the passthrough cache. By setting multiple jobs with I/O\\n   size equal to the cache block size, cache blocks are invalidated\\n   concurrently from different workers.\\n\\nfio --filename=/dev/mapper/cache --name=test --rw=randwrite --bs=64k \\\\\\n--direct=1 --numjobs=2 --randrepeat=0 --size=64m\\n\\n5. Check if demoted matches cached block count. These numbers should\\n   match but may differ due to the data race.\\n\\nnr_demoted=$(dmsetup status cache | awk \u0027{print $12}\u0027)\\necho \\\"$nr_cached, $nr_demoted\\\"\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/md/dm-cache-policy-smq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"4991b5a08751e2e82488fb93ae08849b6aea10d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"1b2bec4a7dcf5f00b7a1cbeeec8997841d783513\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"ac5ee99443891bdb161f5539606a66a1b5e72542\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"93627a29d4b66d4a2def938dfb8610cc80ae454b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"c348ae47d8e65f06429fa41adce9ad986b696766\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"2b62d0611c9af14a16bddf22df2612b4f40eb5a1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/md/dm-cache-policy-smq.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1b2bec4a7dcf5f00b7a1cbeeec8997841d783513\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2b62d0611c9af14a16bddf22df2612b4f40eb5a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4991b5a08751e2e82488fb93ae08849b6aea10d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93627a29d4b66d4a2def938dfb8610cc80ae454b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac5ee99443891bdb161f5539606a66a1b5e72542\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c348ae47d8e65f06429fa41adce9ad986b696766\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.