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CVE-2026-98186

Linux: wifi: mwifiex: bound the pairwise-cipher OUI walk to the IE length

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 in77e642af7f2f6029e12a35c847c56cbd0466e799Also 982b8fcdbb28f63bbbf02f0822c0bbda12ec27ed, 58767b41f87244eebaa5a475b9d276c83b89b933 and 4 moreCVE List
Published6 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 77e642af7f2f6029e12a35c847c56cbd0466e799LinuxCVE List
  • 982b8fcdbb28f63bbbf02f0822c0bbda12ec27edLinuxCVE List
  • 58767b41f87244eebaa5a475b9d276c83b89b933LinuxCVE List
  • 2402c9e2644b7e10c7aaaf87bf12743d7e363559LinuxCVE List
  • 54a9cc5bd70b0d77a5069d4c46998c679a10c857LinuxCVE List
  • 8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960LinuxCVE List
Show all 7 fixed versions
  • 46cda9d42f0d6ec3057d878ddb1f38c0ab9f51dfLinuxCVE 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: mwifiex: bound the pairwise-cipher OUI walk to the IE length

mwifiex_search_oui_in_ie() reads a pairwise-cipher (PTK) count from a beacon/probe-response RSN or WPA information element and then walks that many 4-byte OUIs, comparing each with memcmp(). The count comes straight from the (attacker-supplied) IE and is never checked against the element's own length, and the callers admit the element on element_id alone (has_ieee_hdr() / has_vendor_hdr(), no length check). A crafted RSN/WPA IE with a large pairwise count therefore makes the walk read up to 255 * 4 bytes past the element -- an out-of-bounds read of the kmemdup()'d beacon buffer, reachable from any AP whose beacon/probe response is processed during scan-result parsing.

Pass the number of IE bytes available at the OUI list and bound the walk to the element. Keep the length signed and reject a negative value before any unsigned arithmetic, so a small or zero IE length cannot underflow to a large size_t and defeat the bound.

Found by 0sec automated security-research tooling (https://0sec.ai).

Text from CVE List

Affected versions 18

  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before 77e642af7f2f6029e12a35c847c56cbd0466e799CVE List
  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before 982b8fcdbb28f63bbbf02f0822c0bbda12ec27edCVE List
  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before 58767b41f87244eebaa5a475b9d276c83b89b933CVE List
  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before 2402c9e2644b7e10c7aaaf87bf12743d7e363559CVE List
  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before 54a9cc5bd70b0d77a5069d4c46998c679a10c857CVE List
  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before 8bbef2b1ebfbadc0b9c37bbbf9c9e26fe2e41960CVE List
  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before 46cda9d42f0d6ec3057d878ddb1f38c0ab9f51dfCVE List
  • Linuxaffected: 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e before e667aee1c192d67d27c803007bfa9c6e0873e959CVE List
  • Linuxaffected: 3.0CVE List
  • Linuxunaffected: all versions before 3.0CVE 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