CVE-2026-97958: Linux kernel · net/sched: cls_api: Don't replay RTM_GETCHAIN in tc_ctl_chain().
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e9ac395bb56122a057d0aa91a6b55d9e3fa37c26 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 16:39 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in e9ac395bb56122a057d0aa91a6b55d9e3fa37c26, dff39930ad5e53d202bfdfb14687d1d2fd753b4d, a1c2840d95af1fa3d83ba71e23fa0c674a4c6796 +5
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
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
This vulnerability has been fixed in several Linux kernel commits identified by their hashes. Users should update their Linux kernel to a version that includes these fixes. Since this is a kernel-level issue, applying the official kernel patches or upgrading to a fixed kernel version is the recommended remediation. No other specific mitigations are indicated.
Description
A vulnerability in the Linux kernel's net/sched cls_api component causes excessive CPU usage and a hung task condition when a netlink socket repeatedly sends RTM_GETCHAIN requests without receiving responses. This occurs because the tc_ctl_chain() function replays RTM_GETCHAIN requests unnecessarily, leading to CPU hogging and potential system instability. The issue arises from improper handling of netlink socket receive buffer full conditions and incorrect replay logic applied to RTM_GETCHAIN messages.
References
- git.kernel.org/stable/c/240251a4ca7cda213103694b6e21c4a5745e5d8b (opens in a new tab)
- git.kernel.org/stable/c/9a0f07f7dbd1bfe8c2fd03ad055e9e60a703d5df (opens in a new tab)
- git.kernel.org/stable/c/6558b0d46c5941ed1aa67da8878e224c54239cc5 (opens in a new tab)
- git.kernel.org/stable/c/96c2fc5daf983af2e0c1256c31e89c1f3f855279 (opens in a new tab)
- git.kernel.org/stable/c/a1c2840d95af1fa3d83ba71e23fa0c674a4c6796 (opens in a new tab)
- git.kernel.org/stable/c/503ba58481e3ba69d28127d35a39cec529f9670c (opens in a new tab)
- git.kernel.org/stable/c/e9ac395bb56122a057d0aa91a6b55d9e3fa37c26 (opens in a new tab)
- git.kernel.org/stable/c/dff39930ad5e53d202bfdfb14687d1d2fd753b4d (opens in a new tab)