SUSE · security update for kernel
Affects SUSESource GCVE Database
Not known to be exploited : upgrade to 9.8 when convenient.
Data as of 25 Oct 2026, 19:02 UTC
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
Disclosed: evidence found.
CVE published 24 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
Red Hatredhat/kernelpkg:rpm/redhat/kernelOther threats | Affected
| Fixed in
|
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
- access.redhat.com/errata/RHSA-2025:21926 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2396941 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_21926.json (opens in a new tab)
- ubuntu.com/security/CVE-2025-39843 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-39843 (opens in a new tab)
- git.kernel.org/linus/850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f (opens in a new tab)
- git.kernel.org/stable/c/243b705a90ed8449f561a271cf251fd2e939f3db (opens in a new tab)
- git.kernel.org/stable/c/522ffe298627cfe72539d72167c2e20e72b5e856 (opens in a new tab)
- git.kernel.org/stable/c/850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f (opens in a new tab)
- git.kernel.org/stable/c/994b03b9605d36d814c611385fbf90ca6db20aa8 (opens in a new tab)
- git.kernel.org/stable/c/eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8100-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8125-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8126-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-5 (opens in a new tab)
- ubuntu.com/security/notices/USN-8165-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8261-1 (opens in a new tab)
- suse.com/support/security/rating/ (opens in a new tab)
- ftp.suse.com/pub/projects/security/csaf/rhsa-2025_21926.json (opens in a new tab)
- lists.suse.com/pipermail/suse-liberty-linux-updates/2026-April/003109.html (opens in a new tab)
- suse.com/security/cve/CVE-2025-39843/ (opens in a new tab)