CVE-2026-98380: Linux kernel · net/sched: reject IDR error pointers when deleting actions
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · 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.
Exploitation evidence
Disclosed: evidence found.
CVE published 9 Oct 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 applied to the Linux kernel to reject IDR error pointers in the tcf_action_delete() function, preventing the kernel panic. Users should update to a patched kernel version that includes this fix. Since this is a kernel-level vulnerability, applying the official kernel update from the vendor or distribution is the recommended remediation. Patch status is not explicitly confirmed in the provided data; users should consult their Linux distribution's security advisories for the specific fixed kernel versions.
Description
A vulnerability in the Linux kernel's network scheduler (net/sched) was resolved that involved improper handling of IDR error pointers during action deletion in the tcf_action_delete() function. This flaw could lead to a kernel panic due to a null pointer dereference when tcf_idr_delete_index() misinterprets an error pointer as a valid action. The issue was identified through kernel address sanitizer (KASAN) reports and reproduced using hardware execution breakpoints. The fix involves rejecting error pointers and returning an error code instead of dereferencing invalid memory.
References
- ubuntu.com/security/CVE-2026-98380 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98380 (opens in a new tab)
- git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80 (opens in a new tab)
- git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d (opens in a new tab)
- git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647 (opens in a new tab)
- git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d (opens in a new tab)
- git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26 (opens in a new tab)
- git.kernel.org/stable/c/a9551f26287debe6d8aa6e8841974661065b975f (opens in a new tab)
- git.kernel.org/stable/c/c82b797abe668d0b668601a93ba2c0b071a63574 (opens in a new tab)
- git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923 (opens in a new tab)