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CVE-2026-23396

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 6.12.78, 0, 7.0, <7c55a3deaf7eaaafa2546f8de7fed19382a0a116, <2.6.26, <0a4da176ae4b4e075a19c00d3e269cfd5e05a813, <=5.10.*, <=6.6.*, <c1e3f2416fb27c816ce96d747d3e784e31f4d95c, <=6.19.*, 2e3c8736820bf72a8ad10721c7e31d36d4fa7790, 5.15.203, <=6.18.*, 6.1.167, <a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004, <74de6fa472b03bc8cde0a081484e9960bcbda568, <=*, 5.10.253, <=5.15.*, <c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd, 6.19.10, <14a4fd13657a3f2489db6566f081adfb27a49c64, 6.6.130, 6.18.20, <44699c6cdfce80a0f296b54ae9314461e3e41b3d, 2.6.26

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix NULL deref in mesh_matches_local() mesh_matches_local() unconditionally dereferences ie->mesh_config to compare mesh configuration parameters. When called from mesh_rx_csa_frame(), the parsed action-frame elements may not contain a Mesh Configuration IE, leaving ie->mesh_config NULL and triggering a kernel NULL pointer dereference. The other two callers are already safe: - ieee80211_mesh_rx_bcn_presp() checks !elems->mesh_config before calling mesh_matches_local() - mesh_plink_get_event() is only reached through mesh_process_plink_frame(), which checks !elems->mesh_config, too mesh_rx_csa_frame() is the only caller that passes raw parsed elements to mesh_matches_local() without guarding mesh_config. An adjacent attacker can exploit this by sending a crafted CSA action frame that includes a valid Mesh ID IE but omits the Mesh Configuration IE, crashing the kernel. The captured crash log: Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: events_unbound cfg80211_wiphy_work [...] Call Trace: <TASK> ? __pfx_mesh_matches_local (net/mac80211/mesh.c:65) ieee80211_mesh_rx_queued_mgmt (net/mac80211/mesh.c:1686) [...] ieee80211_iface_work (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802) [...] cfg80211_wiphy_work (net/wireless/core.c:426) process_one_work (net/kernel/workqueue.c:3280) ? assign_work (net/kernel/workqueue.c:1219) worker_thread (net/kernel/workqueue.c:3352) ? __pfx_worker_thread (net/kernel/workqueue.c:3385) kthread (net/kernel/kthread.c:436) [...] ret_from_fork_asm (net/arch/x86/entry/entry_64.S:255) </TASK> This patch adds a NULL check for ie->mesh_config at the top of mesh_matches_local() to return false early when the Mesh Configuration IE is absent.

Gravité et risque d'exploitation

CVE-2026-23396 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 0.12 %, ce qui la place devant 1.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 6.12.78, 0, 7.0, <7c55a3deaf7eaaafa2546f8de7fed19382a0a116, <2.6.26, <0a4da176ae4b4e075a19c00d3e269cfd5e05a813, <=5.10.*, <=6.6.*, <c1e3f2416fb27c816ce96d747d3e784e31f4d95c, <=6.19.*, 2e3c8736820bf72a8ad10721c7e31d36d4fa7790, 5.15.203, <=6.18.*, 6.1.167, <a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004, <74de6fa472b03bc8cde0a081484e9960bcbda568, <=*, 5.10.253, <=5.15.*, <c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd, 6.19.10, <14a4fd13657a3f2489db6566f081adfb27a49c64, 6.6.130, 6.18.20, <44699c6cdfce80a0f296b54ae9314461e3e41b3d, 2.6.26) 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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