Vulnerability-Lookup

FKIE_CVE-2024-49960

Vulnerability from fkie_nvd - Published: 2024-10-21 18:15 - Updated: 2026-08-04 11:21

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 We should guarantee the timer is no longer active before kfree(sbi).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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0ce160c5bdb67081a62293028dc85758a8efb22a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/22e9b83f0f33bc5a7a3181769d1dccbf021f5b04	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7aac0c17a8cdf4a3236991c1e60435c6a984076c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9203817ba46ebba7c865c8de2aba399537b6e891	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b85569585d0154d4db1e4f9e3e6a4731d407feb0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cf3196e5e2f36cd80dab91ffae402e13935724bc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fa78fb51d396f4f2f80f8e96a3b1516f394258be	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html	Mailing List, Third Party Advisory

Impacted products

Vendor	Product	Version
debian	debian_linux	11.0
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

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    {
      "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."
    },
    {
      "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 ext4_stop_mmpd."
    }
  ],
  "id": "CVE-2024-49960",
  "lastModified": "2026-08-04T11:21:02.470",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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          "role": "CISA Coordinator",
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  "vulnStatus": "Modified",
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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

Title

ext4: fix timer use-after-free on failed mount

Summary

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

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/7aac0c17a8cdf4a32…
https://git.kernel.org/stable/c/22e9b83f0f33bc5a7…
https://git.kernel.org/stable/c/cf3196e5e2f36cd80…
https://git.kernel.org/stable/c/9203817ba46ebba7c…
https://git.kernel.org/stable/c/fa78fb51d396f4f2f…
https://git.kernel.org/stable/c/b85569585d0154d4d…
https://git.kernel.org/stable/c/0ce160c5bdb67081a…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-49960",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:35:13.994206Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-22T13:38:47.803Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T22:23:41.082Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
            "fs/ext4/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "lessThan": "b85569585d0154d4db1e4f9e3e6a4731d407feb0",
              "status": "affected",
              "version": "618f003199c6188e01472b03cdbba227f1dc5f24",
              "versionType": "git"
            },
            {
              "lessThan": "0ce160c5bdb67081a62293028dc85758a8efb22a",
              "status": "affected",
              "version": "618f003199c6188e01472b03cdbba227f1dc5f24",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "cecfdb9cf9a700d1037066173abac0617f6788df",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "eb7b40d9d3785f7a131fb0b1f89bb6efa46c1833",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.237",
              "status": "affected",
              "version": "5.10.51",
              "versionType": "semver"
            },
            {
              "lessThan": "5.13",
              "status": "affected",
              "version": "5.12.18",
              "versionType": "semver"
            },
            {
              "lessThan": "5.14",
              "status": "affected",
              "version": "5.13.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.237",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.181",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.118",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.10.*",
              "status": "unaffected",
              "version": "6.10.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.237",
                  "versionStartIncluding": "5.10.51",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.181",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.118",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.55",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10.14",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.11.3",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.12.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.13.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is triggered by mounting a crafted ext4 image via the mount(2)/fsconfig(2) syscall path, which requires local system access to the block device or image file. There is no remote or network-facing entry point into `ext4_fill_super()`.\nAC:L - The attacker fully controls the crafted image: enabling the MMP feature starts kmmpd, and planting a later-stage mount failure plus an unreadable/corrupt MMP block deterministically drives `ext4_stop_mmpd()` \u2192 `ext4_error_err()` \u2192 `mod_timer()` after the timer was already cancelled. syzbot reproduced it reliably; no race or uncontrolled memory-layout condition is involved.\nPR:N - The attacker supplies only a malicious filesystem image or removable device and needs no account on the target; the privileged mount is performed by the victim or by an automounter (udisks2/autofs) acting on their behalf.\nUI:R - Because ext4 is not FS_USERNS_MOUNT, someone with CAP_SYS_ADMIN (or a desktop automount daemon reacting to inserted media) must actually mount the attacker-supplied image for the failed-mount cleanup path to run.\nS:U - The freed `ext4_sb_info` and the stale timer both live in the kernel\u0027s own security authority; exploitation yields kernel-level compromise but does not cross a hypervisor, IOMMU, or sandbox boundary.\nC:H - The armed `s_err_report` timer_list points into freed slab memory, so reallocating that object gives the attacker a use-after-free with control over the freed contents, which is leverageable into arbitrary kernel memory disclosure.\nI:H - The stale timer wheel entry is both an hlist_node and a `-\u003efunction` pointer read out of attacker-reallocatable memory, giving list-corruption write and control-flow-hijack primitives executed from softirq context.\nA:H - The use-after-free reliably produces an ODEBUG/KASAN splat and, in production kernels, timer-wheel corruption leading to an oops or panic when the freed object is reused or the timer expires."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:40:42.935Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "ext4: fix timer use-after-free on failed mount",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49960",
    "datePublished": "2024-10-21T18:02:13.119Z",
    "dateReserved": "2024-10-21T12:17:06.049Z",
    "dateUpdated": "2026-08-05T11:40:42.935Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.