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Linux Kernel CVE-2022-50533

MEDIUM
NULL Pointer Dereference (CWE-476)
2025-10-07 416baaa9-dc9f-4396-8d5f-8c081fb06d67
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
5.3 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 17, 2026 - 20:45 vuln.today
Patch released
Mar 17, 2026 - 20:45 nvd
Patch available
CVE Published
Oct 07, 2025 - 16:15 nvd
MEDIUM 5.5

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: mlme: fix null-ptr deref on failed assoc

If association to an AP without a link 0 fails, then we crash in tracing because it assumes that either ap_mld_addr or link 0 BSS is valid, since we clear sdata->vif.valid_links and then don't add the ap_mld_addr to the struct.

Since we clear also sdata->vif.cfg.ap_addr, keep a local copy of it and assign it earlier, before clearing valid_links, to fix this.

AnalysisAI

A null pointer dereference vulnerability exists in the Linux kernel's WiFi mac80211 MLME (MAC Layer Management Entity) implementation that crashes the kernel during WiFi association tracing when an AP connection without link 0 fails. The vulnerability affects all Linux kernel versions with the vulnerable code path in the mac80211 wireless driver subsystem, allowing a local authenticated attacker to trigger a denial of service condition. The EPSS score of 0.01% indicates this is rarely exploited in practice, though patches are publicly available from kernel.org.

Technical ContextAI

This vulnerability resides in the Linux kernel's mac80211 wireless subsystem (CPE: cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*), specifically within the MLME (Medium Access Control Layer Management Entity) association logic. The root cause is classified as CWE-476 (Null Pointer Dereference) and occurs in the tracing code path when WiFi association fails. The kernel attempts to dereference ap_mld_addr or link 0 BSS pointers without validating they exist; when association fails, sdata->vif.valid_links and sdata->vif.cfg.ap_addr are cleared, but the tracing code still assumes these structures contain valid data, leading to a kernel panic. The fix involves maintaining a local copy of ap_addr and assigning it before clearing valid_links to preserve the reference needed by trace functions.

RemediationAI

Apply the official Linux kernel patch available at https://git.kernel.org/stable/ using any of the three provided commits (78a6a43aaf87180ec7425a2a90468e1b4d09a1ec, bb7743955a929e44b308cc3f63f8cc03873c1bee, or c695dfba8dfb82dc7ace4f22be088916cbf621ca) or upgrade to a kernel version that includes these fixes. Most Linux distributions will backport this patch into their stable kernel updates; check your distribution's security advisory. Until patching is possible, disable WiFi tracing via sysctl or kernel module parameters if feasible in your environment, though this is a workaround rather than a true fix. The primary remediation is kernel upgrade or patch application, which can typically be performed with standard package manager updates (apt, yum, dnf, etc.).

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2022-50533 vulnerability details – vuln.today

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