CVE-2025-68356: Linux kernel · gfs2: Prevent recursive memory reclaim
Affects Linux kernelSource GCVE Database
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
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
Disclosed: evidence found.
CVE published 24 Dec 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 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 25.10linuxpkg:deb/ubuntu/linux@6.17.0-19.19?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1009.9?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1010.10?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp@6.17.0-1009.9?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1009.9?arch=source&distro=questingOther 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 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
- ubuntu.com/security/CVE-2025-68356 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68356 (opens in a new tab)
- git.kernel.org/stable/c/2c5f4a53476e3cab70adc77b38942c066bd2c17c (opens in a new tab)
- git.kernel.org/stable/c/49e7347f4644d031306d56cb4d51e467cbdcbc69 (opens in a new tab)
- git.kernel.org/stable/c/9c0960ed112398bdb6c60ccf6e6b583bc59acede (opens in a new tab)
- git.kernel.org/stable/c/edb2b255618621dc83d0ec23150e16b2c697077f (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-5 (opens in a new tab)
- ubuntu.com/security/notices/USN-8152-1 (opens in a new tab)