CVE-2026-98189: Linux kernel · wifi: wilc1000: fix RX buffer OOB-write in wilc_wlan_handle_isr_ext()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:27 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 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: wilc1000: fix RX buffer OOB-write in wilc_wlan_handle_isr_ext() wilc_wlan_handle_isr_ext() takes the RX transfer size from the device-reported interrupt status register (a 15-bit field shifted left by 2, up to 131068 bytes) and reads that many bytes from the device into rx_buffer, which is only WILC_RX_BUFF_SIZE (96K) large. The wrap check only handles the current offset; the size itself is never compared against the buffer, so a bogus SDIO device can make the driver OOB-write rx_buffer by up to ~32K with data it controls. The oversized transfer also leaves rx_buffer_offset past the end of the buffer, after which the unsigned wrap check stops working and the overflow can repeat. Drop any transfer whose size exceeds the RX buffer, acknowledging the data interrupt and re-arming the RX engine so the bogus frame is discarded and reception can continue. This also restores the rx_buffer_offset <= WILC_RX_BUFF_SIZE invariant the wrap check relies on. This is not expected to change driver behavior in most cases: without this check, an oversized transfer would most likely corrupt neighboring kernel memory instead of completing anyway, and the drop path performs the same interrupt acknowledgment and RX engine re-arming as the normal path, so subsequent transfers are received unaffected. Discovered by Atuin - Automated Vulnerability Discovery Engine.
References
- ubuntu.com/security/CVE-2026-98189 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98189 (opens in a new tab)
- git.kernel.org/linus/c1ba7f7f18465e259cf1b4d9c73fc73853d7f790 (opens in a new tab)
- git.kernel.org/stable/c/14dcf4c3d74c878175b19d3da5986f83f26b1dd5 (opens in a new tab)
- git.kernel.org/stable/c/304a5d72a04a3979a6434088c8d9c5172c2a908e (opens in a new tab)
- git.kernel.org/stable/c/3ddb88e237bc1e59fd37b1cf369f3b6c2dedae26 (opens in a new tab)
- git.kernel.org/stable/c/4f86fb6f9dce04f697da85806ad96a932fc2f079 (opens in a new tab)
- git.kernel.org/stable/c/612ed9224eae70c53c0c88cb0990e0f9b709280a (opens in a new tab)
- git.kernel.org/stable/c/9f6a276ade936a8803f9f3df217c2368944dc321 (opens in a new tab)
- git.kernel.org/stable/c/aeb44a456d126d89863230eef0187e77e6441995 (opens in a new tab)
- git.kernel.org/stable/c/c1ba7f7f18465e259cf1b4d9c73fc73853d7f790 (opens in a new tab)