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CVE-2024-40900 (GCVE-0-2024-40900)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2026-08-05 11:33
VLAI
Title
cachefiles: remove requests from xarray during flushing requests
Summary
In the Linux kernel, the following vulnerability has been resolved: cachefiles: remove requests from xarray during flushing requests Even with CACHEFILES_DEAD set, we can still read the requests, so in the following concurrency the request may be used after it has been freed: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------------------ cachefiles_ondemand_init_object cachefiles_ondemand_send_req REQ_A = kzalloc(sizeof(*req) + data_len) wait_for_completion(&REQ_A->done) cachefiles_daemon_read cachefiles_ondemand_daemon_read // close dev fd cachefiles_flush_reqs complete(&REQ_A->done) kfree(REQ_A) xa_lock(&cache->reqs); cachefiles_ondemand_select_req req->msg.opcode != CACHEFILES_OP_READ // req use-after-free !!! xa_unlock(&cache->reqs); xa_destroy(&cache->reqs) Hence remove requests from cache->reqs when flushing them to avoid accessing freed requests.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:06 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c8383054506c77b814489c09877b5db83fd4abf2 , < 9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7 (git)
Affected: c8383054506c77b814489c09877b5db83fd4abf2 , < 50d0e55356ba5b84ffb51c42704126124257e598 (git)
Affected: c8383054506c77b814489c09877b5db83fd4abf2 , < 37e19cf86a520d65de1de9cb330415c332a40d19 (git)
Affected: c8383054506c77b814489c09877b5db83fd4abf2 , < 0fc75c5940fa634d84e64c93bfc388e1274ed013 (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.95 , ≤ 6.1.* (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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------------------------------------------------- --------- Cachefiles_ondemand_init_object Cachefiles_ondemand_send_req req_a = kzalloc (sizeof (*req) + data_len) Wait_for_completion (\u0026amp; req_a-\u0026gt; ded) gratis (req_a ) xa_lock(\u0026amp;cache-\u0026gt;reqs); cachefiles_ondemand_select_req req-\u0026gt;msg.opcode != CACHEFILES_OP_READ // \u00a1\u00a1\u00a1requiere use-after-free !!! xa_unlock(\u0026amp;cache-\u0026gt;reqs); xa_destroy(\u0026amp;cache-\u0026gt;reqs) Por lo tanto, elimine las solicitudes de cache-\u0026gt;reqs cuando las vac\u00ede para evitar acceder a las solicitudes 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:48:07+00:00",
      "cve": "CVE-2024-40900",
      "id": "CVE-2024-40900",
      "initial_release_date": "2024-07-12T00:00:00+00:00",
      "product_status:known_affected": "150",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cachefiles: remove requests from xarray during flushing requests",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-40900.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T02:31:50Z",
      "cve": "CVE-2024-40900",
      "id": "CVE-2024-40900",
      "initial_release_date": "2024-07-16T02:35:09Z",
      "product_status:known_affected": "330",
      "product_status:known_not_affected": "258",
      "product_status:recommended": "653",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-40900",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-40900.json",
      "version": "83"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T04:39:54.905Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-40900\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:06:34.508297Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:24.950Z\"}}], \"cna\": {\"title\": \"cachefiles: remove requests from xarray during flushing requests\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\", \"lessThan\": \"9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\", \"lessThan\": \"50d0e55356ba5b84ffb51c42704126124257e598\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\", \"lessThan\": \"37e19cf86a520d65de1de9cb330415c332a40d19\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\", \"lessThan\": \"0fc75c5940fa634d84e64c93bfc388e1274ed013\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/cachefiles/daemon.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.19\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.19\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.95\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.35\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/cachefiles/daemon.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7\"}, {\"url\": \"https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598\"}, {\"url\": \"https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19\"}, {\"url\": \"https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncachefiles: remove requests from xarray during flushing requests\\n\\nEven with CACHEFILES_DEAD set, we can still read the requests, so in the\\nfollowing concurrency the request may be used after it has been freed:\\n\\n     mount  |   daemon_thread1    |    daemon_thread2\\n------------------------------------------------------------\\n cachefiles_ondemand_init_object\\n  cachefiles_ondemand_send_req\\n   REQ_A = kzalloc(sizeof(*req) + data_len)\\n   wait_for_completion(\u0026REQ_A-\u003edone)\\n            cachefiles_daemon_read\\n             cachefiles_ondemand_daemon_read\\n                                  // close dev fd\\n                                  cachefiles_flush_reqs\\n                                   complete(\u0026REQ_A-\u003edone)\\n   kfree(REQ_A)\\n              xa_lock(\u0026cache-\u003ereqs);\\n              cachefiles_ondemand_select_req\\n                req-\u003emsg.opcode != CACHEFILES_OP_READ\\n                // req use-after-free !!!\\n              xa_unlock(\u0026cache-\u003ereqs);\\n                                   xa_destroy(\u0026cache-\u003ereqs)\\n\\nHence remove requests from cache-\u003ereqs when flushing them to avoid\\naccessing freed requests.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.95\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.35\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.6\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:17:24.646Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-40900\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:17:24.646Z\", \"dateReserved\": \"2024-07-12T12:17:45.579Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:20:42.192Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.