CVE-2026-23279

취약점 유형

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() In mesh_rx_csa_frame(), elems->mesh_chansw_params_ie is dereferenced at lines 1638 and 1642 without a prior NULL check: ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl; ... pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value); The mesh_matches_local() check above only validates the Mesh ID, Mesh Configuration, and Supported Rates IEs. It does not verify the presence of the Mesh Channel Switch Parameters IE (element ID 118). When a received CSA action frame omits that IE, ieee802_11_parse_elems() leaves elems->mesh_chansw_params_ie as NULL, and the unconditional dereference causes a kernel NULL pointer dereference. A remote mesh peer with an established peer link (PLINK_ESTAB) can trigger this by sending a crafted SPECTRUM_MGMT/CHL_SWITCH action frame that includes a matching Mesh ID and Mesh Configuration IE but omits the Mesh Channel Switch Parameters IE. No authentication beyond the default open mesh peering is required. Crash confirmed on kernel 6.17.0-5-generic via mac80211_hwsim: BUG: kernel NULL pointer dereference,

영향받는 제품

• linux linux_kernel

참고 자료

• https://git.kernel.org/stable/c/017c1792525064a723971f0216e6ef86a8c7af11
• https://git.kernel.org/stable/c/22a9adea7e26d236406edc0ea00b54351dd56b9c
• https://git.kernel.org/stable/c/2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab
• https://git.kernel.org/stable/c/753ad20dcbe36b67088c7770d8fc357d7cc43e08
• https://git.kernel.org/stable/c/be8b82c567fda86f2cbb43b7208825125bb31421
• https://git.kernel.org/stable/c/cc6d5a3c0a854aeae00915fc5386570c86029c60