CVE-2024-56739

Medium

In the Linux kernel, the following vulnerability has been resolved: rtc: check if __rtc_read_time was successful in rtc_timer_do_work() If the __rtc_read_time call fails,, the struct rtc_time tm; may contain uninitialized data, or an illegal date/time read from the RTC hardware. When calling rtc_tm_to_ktime later, the result may be a very large value (possibly KTIME_MAX). If there are periodic timers in rtc->timerqueue, they will continually expire, may causing kernel softlockup.

Package Linux Kernel
Published 2024-12-29
Last modified 2025-11-03
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-908

CVE-2024-56739 is classified as CWE-908

See CWE-908 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 2.6.38 and later are affected. Fixed in 4.19.325, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.64, 6.11.11, 6.12.2, 6.13 and their respective stable series.

Affected from
≥ 2.6.38
Fixed in
✓ 4.19.325 4.19.x ✓ 5.4.287 5.4.x ✓ 5.10.231 5.10.x ✓ 5.15.174 5.15.x ✓ 6.1.120 6.1.x ✓ 6.6.64 6.6.x ✓ 6.11.11 6.11.x ✓ 6.12.2 6.12.x ✓ 6.13

References

The following references provide additional information about CVE-2024-56739 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

9 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2024-56739?

    CVE-2024-56739 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 2.6.38 onward and has been patched in 4.19.325, 5.4.287, 5.10.231 and others. CVE-2024-56739 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2024-56739?

    CVE-2024-56739 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2024-56739?

    Yes — CVE-2024-56739 has been patched. Fixed versions include 4.19.325, 5.4.287, 5.10.231 and others. If you are running Linux kernel 2.6.38 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2024-56739 actively exploited?

    No — CVE-2024-56739 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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