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CVE-2026-23396— wifi: mac80211: fix NULL deref in mesh_matches_local()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mesh_matches_local函数无条件解引用空指针，可能导致内核崩溃。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2e3c8736820bf72a8ad10721c7e31d36d4fa7790< 14a4fd13657a3f2489db6566f081adfb27a49c64 affected
2e3c8736820bf72a8ad10721c7e31d36d4fa7790< 74de6fa472b03bc8cde0a081484e9960bcbda568 affected
2e3c8736820bf72a8ad10721c7e31d36d4fa7790< c1e3f2416fb27c816ce96d747d3e784e31f4d95c affected
2e3c8736820bf72a8ad10721c7e31d36d4fa7790< 0a4da176ae4b4e075a19c00d3e269cfd5e05a813 affected
2e3c8736820bf72a8ad10721c7e31d36d4fa7790< a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004 affected
2e3c8736820bf72a8ad10721c7e31d36d4fa7790< 44699c6cdfce80a0f296b54ae9314461e3e41b3d affected
2e3c8736820bf72a8ad10721c7e31d36d4fa7790< 7c55a3deaf7eaaafa2546f8de7fed19382a0a116 affected
2e3c8736820bf72a8ad10721c7e31d36d4fa7790< c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd affected
… +10 more rows
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I. Basic Information for CVE-2026-23396

Vulnerability Information
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Vulnerability Title
wifi: mac80211: fix NULL deref in mesh_matches_local()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mesh_matches_local函数无条件解引用空指针，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2e3c8736820bf72a8ad10721c7e31d36d4fa7790 ~ 14a4fd13657a3f2489db6566f081adfb27a49c64 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-23396

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III. Intelligence Information for CVE-2026-23396

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Patches & Fixes for CVE-2026-23396 (6)

Same Patch Batch · Linux · 2026-03-26 · 3 CVEs total

CVE-2026-23398 icmp: fix NULL pointer dereference in icmp_tag_validation()
CVE-2026-23397 nfnetlink_osf: validate individual option lengths in fingerprints

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23396

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