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CVE-2026-98189

Linux: wifi: wilc1000: fix RX buffer OOB-write in wilc_wlan_handle_isr_ext()

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3ddb88e237bc1e59fd37b1cf369f3b6c2dedae26Also 9f6a276ade936a8803f9f3df217c2368944dc321, 612ed9224eae70c53c0c88cb0990e0f9b709280a and 3 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 3ddb88e237bc1e59fd37b1cf369f3b6c2dedae26LinuxCVE List
  • 9f6a276ade936a8803f9f3df217c2368944dc321LinuxCVE List
  • 612ed9224eae70c53c0c88cb0990e0f9b709280aLinuxCVE List
  • 304a5d72a04a3979a6434088c8d9c5172c2a908eLinuxCVE List
  • 4f86fb6f9dce04f697da85806ad96a932fc2f079LinuxCVE List
  • 14dcf4c3d74c878175b19d3da5986f83f26b1dd5LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 18

  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before 3ddb88e237bc1e59fd37b1cf369f3b6c2dedae26CVE List
  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before 9f6a276ade936a8803f9f3df217c2368944dc321CVE List
  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before aeb44a456d126d89863230eef0187e77e6441995CVE List
  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before 612ed9224eae70c53c0c88cb0990e0f9b709280aCVE List
  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before 304a5d72a04a3979a6434088c8d9c5172c2a908eCVE List
  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before 4f86fb6f9dce04f697da85806ad96a932fc2f079CVE List
  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before 14dcf4c3d74c878175b19d3da5986f83f26b1dd5CVE List
  • Linuxaffected: c5c77ba18ea66aa05441c71e38473efb787705a4 before c1ba7f7f18465e259cf1b4d9c73fc73853d7f790CVE List
  • Linuxaffected: 4.2CVE List
  • Linuxunaffected: all versions before 4.2CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.54 through 6.18.*CVE List
  • Linuxunaffected: 7.2.8 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8