CVE-2026-97921: Linux kernel · tracing: Free histogram the field rejected for a bad modifier
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther 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 fix has been implemented in the Linux kernel tracing subsystem to properly handle freeing of histogram fields with invalid modifiers. Users should update to a patched kernel version that includes this fix. Since this is not a cloud service, remediation requires applying the updated kernel package. Patch status is not explicitly stated in the input; check vendor advisories for the exact fixed versions and update accordingly.
Description
A vulnerability in the Linux kernel tracing subsystem was resolved that involved improper freeing of histogram fields when a hist trigger uses a disallowed modifier. The flaw caused memory leaks due to fields not being freed correctly on error paths. The issue was fixed by correcting the control flow to ensure fields are properly freed and not leaked. This affects specific versions of the linux-hwe-edge kernel.
References
- ubuntu.com/security/CVE-2026-97921 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-97921 (opens in a new tab)
- git.kernel.org/stable/c/b22dc0add7d72b8bd9cae3188db0dd65da1c8652 (opens in a new tab)
- git.kernel.org/stable/c/891c21f6d5673b2a519b536243bfc6dd2d35beb6 (opens in a new tab)
- git.kernel.org/stable/c/e787361bb6b0026ea3eb4d3fa7a304c7fcb99555 (opens in a new tab)
- git.kernel.org/stable/c/230234d12ce42ab04132a32c3a848f07a5d27a71 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-97921 (opens in a new tab)
- git.kernel.org/stable/c/3d42fed18b2c5707b6332ebe87b789fd768eb01b (opens in a new tab)
- git.kernel.org/stable/c/a2652fcf96b63e9da04951e4e58e6a0672df695d (opens in a new tab)