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CVE-2026-53064 (GCVE-0-2026-53064)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
Title
dm cache: fix null-deref with concurrent writes in passthrough mode
Summary
In the Linux kernel, the following vulnerability has been resolved: dm cache: fix null-deref with concurrent writes in passthrough mode In passthrough mode, when dm-cache starts to invalidate a cache entry and bio prison cell lock fails due to concurrent write to the same cached block, mg->cell remains NULL. The error path in invalidate_complete() attempts to unlock and free the cell unconditionally, causing a NULL pointer dereference: KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 134 Comm: fio Not tainted 6.19.0-rc7 #3 PREEMPT RIP: 0010:dm_cell_unlock_v2+0x3f/0x210 <snip> Call Trace: invalidate_complete+0xef/0x430 map_bio+0x130f/0x1a10 cache_map+0x320/0x6b0 __map_bio+0x458/0x510 dm_submit_bio+0x40e/0x16d0 __submit_bio+0x419/0x870 <snip> Reproduce steps: 1. Create a cache device 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. Promote the first data block into cache fio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \ --direct=1 --size=64k 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 first cached block concurrently fio --filename=/dev/mapper/cache --name test --rw=randwrite --bs=4k \ --randrepeat=0 --direct=1 --numjobs=2 --size 64k Fix by checking if mg->cell is valid before attempting to unlock it.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 01264a6a3a3ad7ac1d73443299cd5a9568002454 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < ee38fb00e1a80f46a4990e38f25ecb04ae7b7417 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < c7fb6bc864c4910b344dafa36dd5028e9b980768 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 0aa745fea1f8dc81bcdd0a45e215b6706727b482 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < a2635d541a93fd111e743cf14b6275dc81be2abc (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 25dcc1989c194ba2b5fb6d03cbb9b83814ac0d15 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < df3b8ef06cc62de4fca5d2108e285085b3cffd44 (git)
Affected: b29d4986d0da1a27cd35917cdb433672f5c95d7f , < 7d1f98d668ee34c1d15bdc0420fdd062f24a27c0 (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: fix null-deref with concurrent writes in passthrough mode\n\nIn passthrough mode, when dm-cache starts to invalidate a cache\nentry and bio prison cell lock fails due to concurrent write to\nthe same cached block, mg-\u003ecell remains NULL. The error path in\ninvalidate_complete() attempts to unlock and free the cell\nunconditionally, causing a NULL pointer dereference:\n\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nCPU: 0 UID: 0 PID: 134 Comm: fio Not tainted 6.19.0-rc7 #3 PREEMPT\nRIP: 0010:dm_cell_unlock_v2+0x3f/0x210\n\u003csnip\u003e\nCall Trace:\n invalidate_complete+0xef/0x430\n map_bio+0x130f/0x1a10\n cache_map+0x320/0x6b0\n __map_bio+0x458/0x510\n dm_submit_bio+0x40e/0x16d0\n __submit_bio+0x419/0x870\n\u003csnip\u003e\n\nReproduce steps:\n\n1. Create a cache device\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. Promote the first data block into cache\n\nfio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \\\n--direct=1 --size=64k\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 first cached block concurrently\n\nfio --filename=/dev/mapper/cache --name test --rw=randwrite --bs=4k \\\n--randrepeat=0 --direct=1 --numjobs=2 --size 64k\n\nFix by checking if mg-\u003ecell is valid before attempting to unlock it."
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          "url": "https://git.kernel.org/stable/c/7d1f98d668ee34c1d15bdc0420fdd062f24a27c0"
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      "title": "dm cache: fix null-deref with concurrent writes in passthrough mode",
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    "dateReserved": "2026-06-09T07:44:35.382Z",
    "dateUpdated": "2026-06-24T16:30:07.536Z",
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      "cve": "CVE-2026-53064",
      "date": "2026-09-15",
      "epss": "0.00123",
      "percentile": "0.02341"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-09T14:47:15.000Z",
      "cve": "CVE-2026-53064",
      "id": "msrc_CVE-2026-53064",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "dm cache: fix null-deref with concurrent writes in passthrough mode",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53064.json",
      "version": "2"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53064\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:19.320\",\"lastModified\":\"2026-07-21T17:36:29.553\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm cache: fix null-deref with concurrent writes in passthrough mode\\n\\nIn passthrough mode, when dm-cache starts to invalidate a cache\\nentry and bio prison cell lock fails due to concurrent write to\\nthe same cached block, mg-\u003ecell remains NULL. The error path in\\ninvalidate_complete() attempts to unlock and free the cell\\nunconditionally, causing a NULL pointer dereference:\\n\\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\\nCPU: 0 UID: 0 PID: 134 Comm: fio Not tainted 6.19.0-rc7 #3 PREEMPT\\nRIP: 0010:dm_cell_unlock_v2+0x3f/0x210\\n\u003csnip\u003e\\nCall Trace:\\n invalidate_complete+0xef/0x430\\n map_bio+0x130f/0x1a10\\n cache_map+0x320/0x6b0\\n __map_bio+0x458/0x510\\n dm_submit_bio+0x40e/0x16d0\\n __submit_bio+0x419/0x870\\n\u003csnip\u003e\\n\\nReproduce steps:\\n\\n1. Create a cache device\\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. Promote the first data block into cache\\n\\nfio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \\\\\\n--direct=1 --size=64k\\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 first cached block concurrently\\n\\nfio --filename=/dev/mapper/cache --name test --rw=randwrite --bs=4k \\\\\\n--randrepeat=0 --direct=1 --numjobs=2 --size 64k\\n\\nFix by checking if mg-\u003ecell is valid before attempting to unlock it.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/md/dm-cache-target.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"01264a6a3a3ad7ac1d73443299cd5a9568002454\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"ee38fb00e1a80f46a4990e38f25ecb04ae7b7417\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"c7fb6bc864c4910b344dafa36dd5028e9b980768\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"0aa745fea1f8dc81bcdd0a45e215b6706727b482\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"a2635d541a93fd111e743cf14b6275dc81be2abc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"25dcc1989c194ba2b5fb6d03cbb9b83814ac0d15\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"df3b8ef06cc62de4fca5d2108e285085b3cffd44\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b29d4986d0da1a27cd35917cdb433672f5c95d7f\",\"lessThan\":\"7d1f98d668ee34c1d15bdc0420fdd062f24a27c0\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/md/dm-cache-target.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\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.12\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"7FED9066-C252-4AA0-A5D6-7FDDC40E11A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.141\",\"matchCriteriaId\":\"97A9FFFA-22BB-4D5C-9790-5A2286E392F7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.91\",\"matchCriteriaId\":\"C918746B-DE6F-448F-A93E-A04C5481688D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.33\",\"matchCriteriaId\":\"96D99E49-380D-43AB-BDBA-25C3AD018A9C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.10\",\"matchCriteriaId\":\"A13475D2-59BF-4716-94B5-7C1D239A2CF4\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01264a6a3a3ad7ac1d73443299cd5a9568002454\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0aa745fea1f8dc81bcdd0a45e215b6706727b482\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/25dcc1989c194ba2b5fb6d03cbb9b83814ac0d15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7d1f98d668ee34c1d15bdc0420fdd062f24a27c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a2635d541a93fd111e743cf14b6275dc81be2abc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c7fb6bc864c4910b344dafa36dd5028e9b980768\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/df3b8ef06cc62de4fca5d2108e285085b3cffd44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ee38fb00e1a80f46a4990e38f25ecb04ae7b7417\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T17:45:52+00:00",
      "cve": "CVE-2026-53064",
      "id": "CVE-2026-53064",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm cache: fix null-deref with concurrent writes in passthrough mode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53064.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T16:58:56Z",
      "cve": "CVE-2026-53064",
      "id": "CVE-2026-53064",
      "initial_release_date": "2026-06-26T02:12:54Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "672",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53064",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53064.json",
      "version": "13"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.