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HIGH

CVE-2024-49960

CVSS v3

7.8

HIGH

EPSS Score

0.3 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • linuxUbuntu:24.10all versions · fixed in 6.11.0-18.18
  • linux-awsUbuntu:24.10all versions · fixed in 6.11.0-1009.10
  • linux-gcpUbuntu:24.10all versions · fixed in 6.11.0-1009.9and 1 other package
  • linux-lowlatencyUbuntu:24.10all versions · fixed in 6.11.0-1010.11
  • linux-oracleUbuntu:24.10all versions · fixed in 6.11.0-1011.12
  • linux-raspiUbuntu:24.10all versions · fixed in 6.11.0-1008.8
  • linux-realtimeUbuntu:24.10all versions · fixed in 6.11.0-1005.5

Vendor advisories

  • CVE-2024-49960 Red Hat Product Security305 products fixed · 112 known affected

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

    kernel as a component of Red Hat Enterprise Linux 6 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6 · kernel-bootwrapper as a component of Red Hat Enterprise Linux 6

  • RHSA-2025:6966 Red Hat Product Security305 products fixed

    Red Hat Security Advisory: kernel security update

Full record on NVD

Description

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 We should guarantee the timer is no longer active before kfree(sbi).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

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2024-10-21
Last Modified
2026-08-04

Frequently asked questions

What is CVE-2024-49960?

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.

Is CVE-2024-49960 actively exploited?

Active exploitation of CVE-2024-49960 has not been confirmed. Its EPSS score was 0.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2024-49960?

CVE-2024-49960 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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