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CVE-2024-26840 (GCVE-0-2024-26840)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:10 – Updated: 2026-05-11 20:05
VLAI
Title
cachefiles: fix memory leak in cachefiles_add_cache()
Summary
In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix memory leak in cachefiles_add_cache() The following memory leak was reported after unbinding /dev/cachefiles: ================================================================== unreferenced object 0xffff9b674176e3c0 (size 192): comm "cachefilesd2", pid 680, jiffies 4294881224 hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc ea38a44b): [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370 [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0 [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120 [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0 [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0 [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520 [<ffffffff8ebc5069>] ksys_write+0x69/0xf0 [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140 [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 ================================================================== Put the reference count of cache_cred in cachefiles_daemon_unbind() to fix the problem. And also put cache_cred in cachefiles_add_cache() error branch to avoid memory leaks.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-28 19:58 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < cb5466783793e66272624cf71925ae1d1ba32083 (git)
Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < 037d5a949b0455540ef9aab34c10ddf54b65d285 (git)
Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < 43eccc5823732ba6daab2511ed32dfc545a666d8 (git)
Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < 94965be37add0983672e48ecb33cdbda92b62579 (git)
Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < 8b218e2f0a27a9f09428b1847b4580640b9d1e58 (git)
Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < 38e921616320d159336b0ffadb09e9fb4945c7c3 (git)
Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < 9cac69912052a4def571fedf1cb9bb4ec590e25a (git)
Affected: 9ae326a69004dea8af2dae4fde58de27db700a8d , < e21a2f17566cbd64926fb8f16323972f7a064444 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 4.19.309 , ≤ 4.19.* (semver)
Unaffected: 5.4.271 , ≤ 5.4.* (semver)
Unaffected: 5.10.212 , ≤ 5.10.* (semver)
Unaffected: 5.15.151 , ≤ 5.15.* (semver)
Unaffected: 6.1.80 , ≤ 6.1.* (semver)
Unaffected: 6.6.19 , ≤ 6.6.* (semver)
Unaffected: 6.7.7 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncachefiles: fix memory leak in cachefiles_add_cache()\\n\\nThe following memory leak was reported after unbinding /dev/cachefiles:\\n\\n==================================================================\\nunreferenced object 0xffff9b674176e3c0 (size 192):\\n  comm \\\"cachefilesd2\\\", pid 680, jiffies 4294881224\\n  hex dump (first 32 bytes):\\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n  backtrace (crc ea38a44b):\\n    [\u003cffffffff8eb8a1a5\u003e] kmem_cache_alloc+0x2d5/0x370\\n    [\u003cffffffff8e917f86\u003e] prepare_creds+0x26/0x2e0\\n    [\u003cffffffffc002eeef\u003e] cachefiles_determine_cache_security+0x1f/0x120\\n    [\u003cffffffffc00243ec\u003e] cachefiles_add_cache+0x13c/0x3a0\\n    [\u003cffffffffc0025216\u003e] cachefiles_daemon_write+0x146/0x1c0\\n    [\u003cffffffff8ebc4a3b\u003e] vfs_write+0xcb/0x520\\n    [\u003cffffffff8ebc5069\u003e] ksys_write+0x69/0xf0\\n    [\u003cffffffff8f6d4662\u003e] do_syscall_64+0x72/0x140\\n    [\u003cffffffff8f8000aa\u003e] entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n==================================================================\\n\\nPut the reference count of cache_cred in cachefiles_daemon_unbind() to\\nfix the problem. And also put cache_cred in cachefiles_add_cache() error\\nbranch to avoid memory leaks.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: corrige la p\\u00e9rdida de memoria en cachefiles_add_cache() Se inform\\u00f3 la siguiente p\\u00e9rdida de memoria despu\\u00e9s de desvincular /dev/cachefiles: ================= ==================================================== objeto sin referencia 0xffff9b674176e3c0 (tama\\u00f1o 192): comm \\\"cachefilesd2\\\", pid 680, jiffies 4294881224 volcado hexadecimal (primeros 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ retroceso (crc ea38a44b): [ ] kmem_cache_alloc+0x2d5/0x370 [] prepare_creds+0x26/0x2e0 [] cachefiles_determine_cache_security+0x1f/0x120 [] cachefiles_add_cache+0x13c/0x 3a0 [] cachefiles_daemon_write+0x146/0x1c0 [ ] vfs_write+0xcb/0x520 [] ksys_write+0x69/0xf0 [] do_syscall_64+0x72/0x140 [] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 =============== ==================================================== == Coloque el recuento de referencias de cache_cred en cachefiles_daemon_unbind() para solucionar el problema. Y tambi\\u00e9n coloque cache_cred en la rama de error cachefiles_add_cache() para evitar p\\u00e9rdidas de memoria.\"}]",
      "id": "CVE-2024-26840",
      "lastModified": "2025-01-07T17:13:19.863",
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      "published": "2024-04-17T10:15:09.910",
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-401\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26840\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-17T10:15:09.910\",\"lastModified\":\"2026-06-17T07:18:28.437\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncachefiles: fix memory leak in cachefiles_add_cache()\\n\\nThe following memory leak was reported after unbinding /dev/cachefiles:\\n\\n==================================================================\\nunreferenced object 0xffff9b674176e3c0 (size 192):\\n  comm \\\"cachefilesd2\\\", pid 680, jiffies 4294881224\\n  hex dump (first 32 bytes):\\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n  backtrace (crc ea38a44b):\\n    [\u003cffffffff8eb8a1a5\u003e] kmem_cache_alloc+0x2d5/0x370\\n    [\u003cffffffff8e917f86\u003e] prepare_creds+0x26/0x2e0\\n    [\u003cffffffffc002eeef\u003e] cachefiles_determine_cache_security+0x1f/0x120\\n    [\u003cffffffffc00243ec\u003e] cachefiles_add_cache+0x13c/0x3a0\\n    [\u003cffffffffc0025216\u003e] cachefiles_daemon_write+0x146/0x1c0\\n    [\u003cffffffff8ebc4a3b\u003e] vfs_write+0xcb/0x520\\n    [\u003cffffffff8ebc5069\u003e] ksys_write+0x69/0xf0\\n    [\u003cffffffff8f6d4662\u003e] do_syscall_64+0x72/0x140\\n    [\u003cffffffff8f8000aa\u003e] entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n==================================================================\\n\\nPut the reference count of cache_cred in cachefiles_daemon_unbind() to\\nfix the problem. And also put cache_cred in cachefiles_add_cache() error\\nbranch to avoid memory leaks.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: corrige la p\u00e9rdida de memoria en cachefiles_add_cache() Se inform\u00f3 la siguiente p\u00e9rdida de memoria despu\u00e9s de desvincular /dev/cachefiles: ================= ==================================================== objeto sin referencia 0xffff9b674176e3c0 (tama\u00f1o 192): comm \\\"cachefilesd2\\\", pid 680, jiffies 4294881224 volcado hexadecimal (primeros 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ retroceso (crc ea38a44b): [ ] kmem_cache_alloc+0x2d5/0x370 [] prepare_creds+0x26/0x2e0 [] cachefiles_determine_cache_security+0x1f/0x120 [] cachefiles_add_cache+0x13c/0x 3a0 [] cachefiles_daemon_write+0x146/0x1c0 [ ] vfs_write+0xcb/0x520 [] ksys_write+0x69/0xf0 [] do_syscall_64+0x72/0x140 [] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 =============== ==================================================== == Coloque el recuento de referencias de cache_cred en cachefiles_daemon_unbind() para solucionar el problema. Y tambi\u00e9n coloque cache_cred en la rama de error cachefiles_add_cache() para evitar p\u00e9rdidas de memoria.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/cachefiles/cache.c\",\"fs/cachefiles/daemon.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"cb5466783793e66272624cf71925ae1d1ba32083\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"037d5a949b0455540ef9aab34c10ddf54b65d285\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"43eccc5823732ba6daab2511ed32dfc545a666d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"94965be37add0983672e48ecb33cdbda92b62579\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"8b218e2f0a27a9f09428b1847b4580640b9d1e58\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"38e921616320d159336b0ffadb09e9fb4945c7c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"9cac69912052a4def571fedf1cb9bb4ec590e25a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae326a69004dea8af2dae4fde58de27db700a8d\",\"lessThan\":\"e21a2f17566cbd64926fb8f16323972f7a064444\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/cachefiles/cache.c\",\"fs/cachefiles/daemon.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.30\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.30\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.309\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.271\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.212\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.151\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.80\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.19\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.7.7\",\"lessThanOrEqual\":\"6.7.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8\",\"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}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-05-28T19:58:24.475717Z\",\"id\":\"CVE-2024-26840\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T08:24:24+00:00",
      "cve": "CVE-2024-26840",
      "id": "CVE-2024-26840",
      "initial_release_date": "2024-04-17T00:00:00+00:00",
      "product_status:fixed": "709",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "8",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cachefiles: fix memory leak in cachefiles_add_cache()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26840.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-05T17:00:57Z",
      "cve": "CVE-2024-26840",
      "id": "CVE-2024-26840",
      "initial_release_date": "2024-04-18T02:30:13Z",
      "product_status:known_affected": "461",
      "product_status:known_not_affected": "53",
      "product_status:recommended": "828",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26840",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26840.json",
      "version": "70"
    },
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following vulnerability has been resolved:\\n\\ncachefiles: fix memory leak in cachefiles_add_cache()\\n\\nThe following memory leak was reported after unbinding /dev/cachefiles:\\n\\n==================================================================\\nunreferenced object 0xffff9b674176e3c0 (size 192):\\n  comm \\\"cachefilesd2\\\", pid 680, jiffies 4294881224\\n  hex dump (first 32 bytes):\\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\\n  backtrace (crc ea38a44b):\\n    [\u003cffffffff8eb8a1a5\u003e] kmem_cache_alloc+0x2d5/0x370\\n    [\u003cffffffff8e917f86\u003e] prepare_creds+0x26/0x2e0\\n    [\u003cffffffffc002eeef\u003e] cachefiles_determine_cache_security+0x1f/0x120\\n    [\u003cffffffffc00243ec\u003e] cachefiles_add_cache+0x13c/0x3a0\\n    [\u003cffffffffc0025216\u003e] cachefiles_daemon_write+0x146/0x1c0\\n    [\u003cffffffff8ebc4a3b\u003e] vfs_write+0xcb/0x520\\n    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And also put cache_cred in cachefiles_add_cache() error\\nbranch to avoid memory leaks.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.309\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.271\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.212\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.151\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.80\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.19\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.7\", \"versionStartIncluding\": \"2.6.30\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"2.6.30\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:05:09.433Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26840\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:05:09.433Z\", \"dateReserved\": \"2024-02-19T14:20:24.182Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:10:06.180Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.