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CVE-2026-23279

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <3.13, 0, 7.0, 6.18.17, <be8b82c567fda86f2cbb43b7208825125bb31421, <22a9adea7e26d236406edc0ea00b54351dd56b9c, <=5.10.*, <=6.6.*, <2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab, <cc6d5a3c0a854aeae00915fc5386570c86029c60, <=6.19.*, <753ad20dcbe36b67088c7770d8fc357d7cc43e08, <f061336f072ab03fd29270ae61fede46bf8fd69d, 5.15.203, <f5d8af683410a8c82e48b51291915bd612523d9a, <=6.18.*, 3.13, 6.19.7, 6.1.167, <=*, 5.10.253, <=5.15.*, <017c1792525064a723971f0216e6ef86a8c7af11, 6.12.77, 6.6.130, 8f2535b92d685c68db4bc699dd78462a646f6ef9

Description

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, address: 0000000000000000 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:ieee80211_mesh_rx_queued_mgmt+0x143/0x2a0 [mac80211] CR2: 0000000000000000 Fix by adding a NULL check for mesh_chansw_params_ie after mesh_matches_local() returns, consistent with how other optional IEs are guarded throughout the mesh code. The bug has been present since v3.13 (released 2014-01-19).

Gravité et risque d'exploitation

CVE-2026-23279 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.14 %, ce qui la place devant 2.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <3.13, 0, 7.0, 6.18.17, <be8b82c567fda86f2cbb43b7208825125bb31421, <22a9adea7e26d236406edc0ea00b54351dd56b9c, <=5.10.*, <=6.6.*, <2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab, <cc6d5a3c0a854aeae00915fc5386570c86029c60, <=6.19.*, <753ad20dcbe36b67088c7770d8fc357d7cc43e08, <f061336f072ab03fd29270ae61fede46bf8fd69d, 5.15.203, <f5d8af683410a8c82e48b51291915bd612523d9a, <=6.18.*, 3.13, 6.19.7, 6.1.167, <=*, 5.10.253, <=5.15.*, <017c1792525064a723971f0216e6ef86a8c7af11, 6.12.77, 6.6.130, 8f2535b92d685c68db4bc699dd78462a646f6ef9) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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