CVE-2026-98887: Linux kernel · wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:29 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.
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO hwsim_tx_info_frame_received_nl() casts the HWSIM_ATTR_TX_INFO payload to a struct hwsim_tx_rate * and unconditionally reads IEEE80211_TX_MAX_RATES entries (8 bytes) from it. The policy only bounds the attribute from above (NLA_BINARY .len is a maximum) and the op sets GENL_DONT_VALIDATE_STRICT, so a short or zero-length attribute is accepted and the loop reads past the payload. Require the exact length in the policy, so a malformed attribute is rejected before the handler runs.
References
- ubuntu.com/security/CVE-2026-98887 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98887 (opens in a new tab)
- git.kernel.org/stable/c/13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7 (opens in a new tab)
- git.kernel.org/stable/c/1ae85bb34fe3510659b86d6a5f8036dd498233f8 (opens in a new tab)
- git.kernel.org/stable/c/3a96bb65b4b820d8b41fa155781ec1c29e3479d4 (opens in a new tab)
- git.kernel.org/stable/c/3dc723ac78a6e4fa0fd49e27e487ed319da40a9f (opens in a new tab)
- git.kernel.org/stable/c/59e1f2a0242232b4a3af144ae317d3913fc09046 (opens in a new tab)
- git.kernel.org/stable/c/6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695 (opens in a new tab)
- git.kernel.org/stable/c/b5b1234bbfa25537fb9a5c0d62c328ed4547f721 (opens in a new tab)