CVE-2026-98591: Linux kernel · bpf: Fix bounds check for skb-backed dynptrs
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ed6eec97b534979dcf28b40c389cee57bd6561d4 : patch Linux kernel soon.
Data as of 26 Oct 2026, 14:05 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in ed6eec97b534979dcf28b40c389cee57bd6561d4, 1196903a27cac5c929c7517e987a8d159f20c5e5, 37877a24758068742fef687a7cf5362360dde1d1 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 18 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
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– |
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 and is available in the Linux kernel versions identified by the fixed commit hashes. Users should update to a patched kernel version that includes these fixes to mitigate the vulnerability.
Description
A vulnerability in the Linux kernel's skb_pointer_if_linear() function caused an underflow in bounds checking for skb-backed BPF dynptrs. This flaw could lead to returning an arbitrary pointer referencing invalid memory. The issue has been fixed by preventing underflow and overflow in the bounds check calculations.
References
- git.kernel.org/stable/c/1b923538598be768e9f2f258a77a083d00e0c78b (opens in a new tab)
- git.kernel.org/stable/c/37877a24758068742fef687a7cf5362360dde1d1 (opens in a new tab)
- git.kernel.org/stable/c/1196903a27cac5c929c7517e987a8d159f20c5e5 (opens in a new tab)
- git.kernel.org/stable/c/39ffceaddb10753eac12785dba6ac0673860b4ac (opens in a new tab)
- git.kernel.org/stable/c/ed6eec97b534979dcf28b40c389cee57bd6561d4 (opens in a new tab)