CVE-2026-98925: Linux kernel · bpf, sockmap: Fix self-redirect copied_seq double-counting
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 02:28 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 23 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 is available that changes the handling of self-redirect verdicts in the Linux kernel BPF sockmap code to prevent double-counting of copied_seq. Users should apply the updated kernel versions that include this fix. No additional mitigation steps are indicated.
Description
CVE-2026-98925 is a vulnerability in the Linux kernel's BPF sockmap implementation where a self-redirect of packets causes double-counting of the copied_seq TCP sequence number. This leads to warnings and potential instability in TCP receive message handling. The issue is fixed by changing the handling of self-redirect verdicts to avoid double advancement of copied_seq.
References
- ubuntu.com/security/CVE-2026-98925 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98925 (opens in a new tab)
- git.kernel.org/stable/c/490a83d6386eec1d29f470c8d7331677fb46c3b7 (opens in a new tab)
- git.kernel.org/stable/c/88942054191185c6f8bea5568cbb5614d1e99af9 (opens in a new tab)
- git.kernel.org/stable/c/ae1ffd04e98beefbe5d83335d506b0bcd5c2a6b3 (opens in a new tab)
- git.kernel.org/stable/c/cf9aefb26a071cb8b6fdd761c27e022a1184946d (opens in a new tab)
- git.kernel.org/stable/c/dc98def81e3c629e25fcdd5753b1db93aab27ce9 (opens in a new tab)
- git.kernel.org/stable/c/ef6f2182fee6b9721c005ccfc6aec0a47f79bbfa (opens in a new tab)