CVE-2026-98829: Linux kernel · wifi: mac80211: drop oversized fragments to avoid extra_len overflow
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in 9338b2dea74cb0fc80a4c958b68e687610ba2261 : patch Linux kernel soon.
Data as of 26 Oct 2026, 10:12 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 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 9338b2dea74cb0fc80a4c958b68e687610ba2261, 870b8cb9baa9bd859deceb33ae158011e6ba2360, 5e4f3509793b4db2c0835340224743db680e861f
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 24 Oct 2026.
What to do
Upgrade Linux kernel to 9338b2dea74cb0fc80a4c958b68e687610ba2261, 870b8cb9baa9bd859deceb33ae158011e6ba2360 or 5e4f3509793b4db2c0835340224743db680e861f.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available in the Linux kernel as indicated by the fixed commit versions. The vulnerability is resolved by dropping oversized fragments that would cause the length overflow, preventing the kernel crash. Users should update to a Linux kernel version that includes the fix identified by the commits 9338b2dea74cb0fc80a4c958b68e687610ba2261, 870b8cb9baa9bd859deceb33ae158011e6ba2360, or 5e4f3509793b4db2c0835340224743db680e861f. No additional mitigation is required once patched.
Description
A vulnerability in the Linux kernel's mac80211 Wi-Fi subsystem allows oversized fragmented frames to cause an overflow in a 16-bit length field, leading to a kernel crash. The issue arises because the sum of fragment lengths can exceed the maximum value of a 16-bit unsigned integer, causing an integer overflow and buffer overflow during packet reassembly. This flaw has been fixed by dropping oversized fragments to prevent the overflow.