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CVE-2024-49960 (GCVE-0-2024-49960)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-08-05 11:40
VLAI
Title
ext4: fix timer use-after-free on failed mount
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix timer use-after-free on failed mount Syzbot has found an ODEBUG bug in ext4_fill_super The del_timer_sync function cancels the s_err_report timer, which reminds about filesystem errors daily. We should guarantee the timer is no longer active before kfree(sbi). When filesystem mounting fails, the flow goes to failed_mount3, where an error occurs when ext4_stop_mmpd is called, causing a read I/O failure. This triggers the ext4_handle_error function that ultimately re-arms the timer, leaving the s_err_report timer active before kfree(sbi) is called. Fix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 2024-10-22 13:35 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5e4f5138bd8522ebe231a137682d3857209a2c07 , < 7aac0c17a8cdf4a3236991c1e60435c6a984076c (git)
Affected: 618f003199c6188e01472b03cdbba227f1dc5f24 , < 22e9b83f0f33bc5a7a3181769d1dccbf021f5b04 (git)
Affected: 618f003199c6188e01472b03cdbba227f1dc5f24 , < cf3196e5e2f36cd80dab91ffae402e13935724bc (git)
Affected: 618f003199c6188e01472b03cdbba227f1dc5f24 , < 9203817ba46ebba7c865c8de2aba399537b6e891 (git)
Affected: 618f003199c6188e01472b03cdbba227f1dc5f24 , < fa78fb51d396f4f2f80f8e96a3b1516f394258be (git)
Affected: 618f003199c6188e01472b03cdbba227f1dc5f24 , < b85569585d0154d4db1e4f9e3e6a4731d407feb0 (git)
Affected: 618f003199c6188e01472b03cdbba227f1dc5f24 , < 0ce160c5bdb67081a62293028dc85758a8efb22a (git)
Affected: cecfdb9cf9a700d1037066173abac0617f6788df (git)
Affected: eb7b40d9d3785f7a131fb0b1f89bb6efa46c1833 (git)
Affected: 5.10.51 , < 5.10.237 (semver)
Affected: 5.12.18 , < 5.13 (semver)
Affected: 5.13.3 , < 5.14 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.118 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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This triggers the ext4_handle_error function\\nthat ultimately re-arms the timer,\\nleaving the s_err_report timer active before kfree(sbi) is called.\\n\\nFix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: fix timer use-after-free on failed mount Syzbot ha encontrado un error ODEBUG en ext4_fill_super La funci\u00f3n del_timer_sync cancela el temporizador s_err_report, que recuerda los errores del sistema de archivos a diario. Debemos garantizar que el temporizador ya no est\u00e9 activo antes de kfree(sbi). Cuando falla el montaje del sistema de archivos, el flujo va a failed_mount3, donde ocurre un error cuando se llama a ext4_stop_mmpd, lo que causa un error de E/S de lectura. Esto activa la funci\u00f3n ext4_handle_error que, en \u00faltima instancia, vuelve a armar el temporizador, dejando el temporizador s_err_report activo antes de que se llame a kfree(sbi). Solucione el problema cancelando el temporizador s_err_report despu\u00e9s de llamar a 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T17:48:41+00:00",
      "cve": "CVE-2024-49960",
      "id": "CVE-2024-49960",
      "initial_release_date": "2024-10-21T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: fix timer use-after-free on failed mount",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49960.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T02:20:37Z",
      "cve": "CVE-2024-49960",
      "id": "CVE-2024-49960",
      "initial_release_date": "2024-10-26T03:01:43Z",
      "product_status:known_affected": "332",
      "product_status:known_not_affected": "301",
      "product_status:recommended": "804",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-49960",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-49960.json",
      "version": "73"
    },
    "vulnrichment": {
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{\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/super.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076c\"}, {\"url\": \"https://git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04\"}, {\"url\": \"https://git.kernel.org/stable/c/cf3196e5e2f36cd80dab91ffae402e13935724bc\"}, {\"url\": \"https://git.kernel.org/stable/c/9203817ba46ebba7c865c8de2aba399537b6e891\"}, {\"url\": \"https://git.kernel.org/stable/c/fa78fb51d396f4f2f80f8e96a3b1516f394258be\"}, {\"url\": \"https://git.kernel.org/stable/c/b85569585d0154d4db1e4f9e3e6a4731d407feb0\"}, {\"url\": \"https://git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix timer use-after-free on failed mount\\n\\nSyzbot has found an ODEBUG bug in ext4_fill_super\\n\\nThe del_timer_sync function cancels the s_err_report timer,\\nwhich reminds about filesystem errors daily. We should\\nguarantee the timer is no longer active before kfree(sbi).\\n\\nWhen filesystem mounting fails, the flow goes to failed_mount3,\\nwhere an error occurs when ext4_stop_mmpd is called, causing\\na read I/O failure. This triggers the ext4_handle_error function\\nthat ultimately re-arms the timer,\\nleaving the s_err_report timer active before kfree(sbi) is called.\\n\\nFix the issue by canceling the s_err_report timer after calling ext4_stop_mmpd.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.237\", \"versionStartIncluding\": \"5.10.51\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.181\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.118\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.12.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.13.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:54:09.756Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49960\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:54:09.756Z\", \"dateReserved\": \"2024-10-21T12:17:06.049Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:02:13.119Z\", \"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.