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VulnerabilityPublished Updated

CVE-2025-68356: Linux kernel · gfs2: Prevent recursive memory reclaim

Affects Linux kernelSource GCVE Database

0
Authoritative record:CVE-2025-68356

Not known to be exploited · fixed in 6.17.0-1009.9~24.04.2 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity
Medium

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

EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.17.0-1009.9~24.04.2, 6.17.0-1010.10~24.04.1, 6.17.0-1009.9~24.04.3 +11

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Dec 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 26 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 25.10linuxpkg:deb/ubuntu/linux@6.17.0-19.19?arch=source&distro=questingOther threatsAffected
  • <6.17.0-19.19
Fixed in
  • 6.17.0-19.19
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1009.9?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1009.9
Fixed in
  • 6.17.0-1009.9
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1010.10?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1010.10
Fixed in
  • 6.17.0-1010.10
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questingOther threatsAffected
  • 6.17.0-1003.3 – 6.17.0-1017.17
10 affected builds
Fixed in–
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp@6.17.0-1009.9?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1009.9
Fixed in
  • 6.17.0-1009.9
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1009.9?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1009.9
Fixed in
  • 6.17.0-1009.9

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

AI-suggested

A patch is available and has been released by Ubuntu as part of their Linux kernel updates for the HWE edge releases. Users should update to the fixed kernel versions 6.17.0-1009.9~24.04.2 or later, 6.17.0-1010.10~24.04.1 or later, 6.17.0-1009.9~24.04.3 or later, 6.17.0-19.19~24.04.2 or later, and 6.17.0-1018.18 or later. Applying these official updates will mitigate the vulnerability. No additional workarounds are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's gfs2 filesystem code could cause recursive memory reclaim leading to stack memory exhaustion and potential deadlocks during filesystem transactions. The issue arises because the new_inode() function sets inode->i_mapping->gfp_mask to GFP_HIGHUSER_MOVABLE, which includes the __GFP_FS flag, allowing memory allocations to recurse into filesystem reclaim paths. This has been fixed by removing the __GFP_FS flag from the gfp_mask to prevent such recursion and deadlocks. The fix is included in Linux kernel versions 6.17.0 and later for the affected Ubuntu HWE edge releases.

References

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