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CVE-2025-39843VulnerabilityPublished Updated

SUSE · security update for kernel

Affects SUSESource GCVE Database

0

Not known to be exploited : upgrade to 9.8 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

Severity
Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 9.8

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade redhat/kernel to 9.8.

Affected software

ProductAffectedFixed in
Red Hatredhat/kernelpkg:rpm/redhat/kernelOther threatsAffected
  • <9.8
Fixed in
  • 9.8

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update fixing this issue is available from Red Hat and SUSE. Systems running affected kernel versions should apply the vendor-provided kernel update and reboot to activate the fix. Refer to the Red Hat advisory RHSA-2025:21926 for detailed update instructions. No additional mitigation is required beyond applying the official patch and rebooting.

Description

A medium severity vulnerability (CVE-2025-39843) in the Linux kernel's memory management subsystem (slub allocator) has been resolved. The issue involves a potential deadlock caused by lock recursion when set_track_prepare() wakes up the kswapd process while holding a per-CPU lock, under certain debug configurations. This can lead to a spinlock recursion oops on affected systems. The vulnerability affects various Red Hat Enterprise Linux 9 versions and SUSE kernel packages. A security update is available and should be applied with a system reboot.

References

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