CVE-2026-98647: Linux kernel · bpf: Fix divide-by-zero in btf_struct_walk()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b : patch Linux kernel soon.
Data as of 26 Oct 2026, 12:30 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b, b0b3dc66529676228cb938cbcad66920f735c223, 172756f02663ad45c889c001c1a8cb4082a01a05 +4
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
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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 and has been applied in specific Linux kernel commits following version 5.8. Users and administrators should update to a Linux kernel version that includes these fixes to mitigate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Description
A divide-by-zero vulnerability was identified and fixed in the Linux kernel's bpf subsystem, specifically in the btf_struct_walk() function. The flaw occurs when accessing past a struct with a flexible array member whose element type has zero size, causing a divide-by-zero error at program load time. This can lead to kernel crashes during BPF program verification.
References
- git.kernel.org/stable/c/1ea3820937f8022e044c41c6e95c84b02741b45f (opens in a new tab)
- git.kernel.org/stable/c/172756f02663ad45c889c001c1a8cb4082a01a05 (opens in a new tab)
- git.kernel.org/stable/c/934e9ba9f8d05656a48624710be67ca4dc8482e6 (opens in a new tab)
- git.kernel.org/stable/c/63af086cb5fa6f72fd924f86bea4c2194da663a2 (opens in a new tab)
- git.kernel.org/stable/c/8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1 (opens in a new tab)
- git.kernel.org/stable/c/b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b (opens in a new tab)
- git.kernel.org/stable/c/b0b3dc66529676228cb938cbcad66920f735c223 (opens in a new tab)