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

Q: What is the severity of CVE-2026-23396?

CVE-2026-23396 has been classified with a high severity due to the potential for NULL dereference issues.

Q: How do I fix CVE-2026-23396?

To fix CVE-2026-23396, update your Linux kernel to the latest stable version where this vulnerability has been patched.

Q: What is the impact of CVE-2026-23396?

The impact of CVE-2026-23396 may lead to application crashes or system instability when processing certain mesh configurations.

Q: Which versions of the Linux kernel are affected by CVE-2026-23396?

CVE-2026-23396 affects specific versions of the Linux kernel that include the mac80211 subsystem but exact affected versions should be checked with the latest security advisories.

Q: Is CVE-2026-23396 remotely exploitable?

CVE-2026-23396 is not remotely exploitable as it requires local access to the affected system to trigger the vulnerability.

Published Mar 26, 2026

Updated

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

wifi: mac80211: fix NULL deref in meshmatcheslocal()

meshmatcheslocal() unconditionally dereferences ie->meshconfig to compare mesh configuration parameters. When called from meshrxcsaframe(), the parsed action-frame elements may not contain a Mesh Configuration IE, leaving ie->meshconfig NULL and triggering a kernel NULL pointer dereference.

The other two callers are already safe: - ieee80211meshrxbcnpresp() checks !elems->meshconfig before calling meshmatcheslocal() - meshplinkgetevent() is only reached through meshprocessplinkframe(), which checks !elems->meshconfig, too

meshrxcsaframe() is the only caller that passes raw parsed elements to meshmatcheslocal() without guarding meshconfig. 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: eventsunbound cfg80211wiphywork [...] Call Trace: <TASK> ? pfxmeshmatcheslocal (net/mac80211/mesh.c:65) ieee80211meshrxqueuedmgmt (net/mac80211/mesh.c:1686) [...] ieee80211ifacework (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802) [...] cfg80211wiphywork (net/wireless/core.c:426) processonework (net/kernel/workqueue.c:3280) ? assignwork (net/kernel/workqueue.c:1219) workerthread (net/kernel/workqueue.c:3352) ? pfxworkerthread (net/kernel/workqueue.c:3385) kthread (net/kernel/kthread.c:436) [...] retfromforkasm (net/arch/x86/entry/entry64.S:255) </TASK>

This patch adds a NULL check for ie->meshconfig at the top of meshmatcheslocal() to return false early when the Mesh Configuration IE is absent.

Affected Software

260 affected componentsFixes available

Linux Linux kernel (mac80211)

Microsoft azl3 kernel 6.6.126.1-1

Patch available

Linux Linux kernel>=2.6.26.1<5.10.253

Linux Linux kernel>=5.11<5.15.203

Linux Linux kernel>=5.16<6.1.167

Linux Linux kernel>=6.2<6.6.130

Linux Linux kernel>=6.7<6.12.78

Linux Linux kernel>=6.13<6.18.20

Linux Linux kernel>=6.19<6.19.10

Linux Linux kernel=2.6.26

Linux Linux kernel=7.0-rc1

Linux Linux kernel=7.0-rc2

Linux Linux kernel=7.0-rc3

Linux Linux kernel=7.0-rc4

Linux Linux kernel=7.0-rc5

Linux Linux kernel=7.0-rc6

Linux Linux kernel=7.0-rc7

Microsoft azl3 kernel 6.6.126.1-1<6.6.130.1-1

6.6.130.1-1

debian/linux

6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1

ubuntu/linux*

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ubuntu/linux-lts-xenial*

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ubuntu/linux-kvm*

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ubuntu/linux-aws-5.0*

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ubuntu/linux-riscv-5.8*

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ubuntu/linux-azure-fde-5.19*

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ubuntu/linux-intel-iot-realtime*

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ubuntu/linux-nvidia<5.15.0-1107.108

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ubuntu/linux-nvidia-tegra-igx<5.15.0-1053.53

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ubuntu/linux-oem-5.17*

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ubuntu/linux-oracle<5.15.0-1109.115

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ubuntu/linux-oracle-6.5*

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6.8.0-1058.61~22.04.1

ubuntu/linux-raspi<5.15.0-1106.109

5.15.0-1106.109

ubuntu/linux-realtime*

ubuntu/linux-riscv*

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ubuntu/linux-starfive-5.19*

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ubuntu/linux-azure-nvidia*

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ubuntu/linux-gcp<6.8.0-1064.72

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ubuntu/linux-gcp-6.11*

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ubuntu/linux-nvidia-tegra<6.8.0-1030.31

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ubuntu/linux-oem-6.11*

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Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
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Fixed in 6.6.130.1-1
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Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
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Fixed in 5.15.0-1112.119~20.04.1
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Fixed in 5.15.0-1117.126~20.04.1
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Fixed in 5.15.0-1117.126~20.04.2
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Fixed in 5.15.0-1112.122~20.04.1
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Fixed in 5.15.0-186.196~20.04.1
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Fixed in 5.15.0-1106.110~20.04.1
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Fixed in 5.15.0-1107.113~20.04.1
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Fixed in 5.15.0-184.194~20.04.1
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Fixed in 5.15.0-1109.115~20.04.1
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Fixed in 6.8.0-136.136~22.04.3
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Fixed in 5.15.0-1096.98
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Fixed in 5.15.0-1111.120
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Fixed in 6.8.1-1056.57~22.04.2
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Fixed in 5.15.0-1112.119+fips1
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Fixed in 5.15.0-186.196+fips1
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Fixed in 5.15.0-1112.122+fips1
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Fixed in 6.8.0-1059.67
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Fixed in 6.8.0-1046.50
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Fixed in 6.8.0-1061.62
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Fixed in 6.8.0-136.136.2
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Fixed in 6.8.0-1059.62
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Fixed in 6.8.0-1059.62.1
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Fixed in 6.8.0-1030.31
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Fixed in 6.8.0-1058.61
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Fixed in 6.8.0-1061.65
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Fixed in 6.8.0-1033.34
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Fixed in 6.8.0-1028.33
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Fixed in 6.8.0-2050.52
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Fixed in 6.8.1-1056.57
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Fixed in 6.8.0-1061.64+fips1
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Fixed in 6.8.0-1063.71+fips2
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Fixed in 6.8.0-136.136+fips2
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Fixed in 6.8.0-1064.72+fips1

Event History

Mar 26, 2026

CVE Published

via MITRE·10:22 AM

Data Sourced

via MITRE·10:22 AM

Description

Data Sourced

via OSV·11:16 AM

DescriptionSeverityAffected Software

Event

via OSV·11:16 AM

Data Sourced

via NVD·11:16 AM

RemedyDescriptionSeverityWeaknessAffected Software

Mar 27, 2026

Data Sourced

via Microsoft·08:03 AM

DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2026-23396?

CVE-2026-23396 has been classified with a high severity due to the potential for NULL dereference issues.

How do I fix CVE-2026-23396?

To fix CVE-2026-23396, update your Linux kernel to the latest stable version where this vulnerability has been patched.

What is the impact of CVE-2026-23396?

The impact of CVE-2026-23396 may lead to application crashes or system instability when processing certain mesh configurations.

Which versions of the Linux kernel are affected by CVE-2026-23396?

CVE-2026-23396 affects specific versions of the Linux kernel that include the mac80211 subsystem but exact affected versions should be checked with the latest security advisories.

Is CVE-2026-23396 remotely exploitable?

CVE-2026-23396 is not remotely exploitable as it requires local access to the affected system to trigger the vulnerability.

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

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-23396?

How do I fix CVE-2026-23396?

What is the impact of CVE-2026-23396?

Which versions of the Linux kernel are affected by CVE-2026-23396?

Is CVE-2026-23396 remotely exploitable?

Company

Resources

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