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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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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      "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:30:07.536Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/01264a6a3a3ad7ac1d73443299cd5a9568002454"
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          "url": "https://git.kernel.org/stable/c/ee38fb00e1a80f46a4990e38f25ecb04ae7b7417"
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          "url": "https://git.kernel.org/stable/c/0aa745fea1f8dc81bcdd0a45e215b6706727b482"
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          "url": "https://git.kernel.org/stable/c/a2635d541a93fd111e743cf14b6275dc81be2abc"
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        {
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        {
          "url": "https://git.kernel.org/stable/c/df3b8ef06cc62de4fca5d2108e285085b3cffd44"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d1f98d668ee34c1d15bdc0420fdd062f24a27c0"
        }
      ],
      "title": "dm cache: fix null-deref with concurrent writes in passthrough mode",
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    "cveId": "CVE-2026-53064",
    "datePublished": "2026-06-24T16:30:07.536Z",
    "dateReserved": "2026-06-09T07:44:35.382Z",
    "dateUpdated": "2026-06-24T16:30:07.536Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-53064",
      "date": "2026-07-02",
      "epss": "0.00176",
      "percentile": "0.07379"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53064\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:19.320\",\"lastModified\":\"2026-06-24T17:17:19.320\",\"vulnStatus\":\"Received\",\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01264a6a3a3ad7ac1d73443299cd5a9568002454\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0aa745fea1f8dc81bcdd0a45e215b6706727b482\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/25dcc1989c194ba2b5fb6d03cbb9b83814ac0d15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7d1f98d668ee34c1d15bdc0420fdd062f24a27c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2635d541a93fd111e743cf14b6275dc81be2abc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7fb6bc864c4910b344dafa36dd5028e9b980768\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df3b8ef06cc62de4fca5d2108e285085b3cffd44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee38fb00e1a80f46a4990e38f25ecb04ae7b7417\",\"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.

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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.
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Detection rules are retrieved from Rulezet.