CVE-2026-98422

wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

State: Published
Severity: Not scored
Published: Oct 14, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

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

wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

On ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from the AP interface, but it's never decremented again unless the AP is also brought down. Thus, bringing the same AP_VLAN up again will increment the counter again and eventually hit the sanity check:

WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != master->crypto_tx_tailroom_needed_cnt);

Reset it on ifdown to avoid that.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before b0b32d3f163d24ea7134380666193bf398e9dc0bAffected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before f6b34a7d64324faf28eedc0f8678b0f832f1cc36Affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 304a874670a0b6ab5589a7f60b4af0251797b121Affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08Affected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 3d76b45e8432c0d75fcb9e90d92eaa3176898adfAffected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 4b54d01b48445b66c9e576de92b90a3a3ae7b34aAffected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 875835377d8d62c849b4eb03a7abfafa71d7668fAffected f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 4504f3960dc4501c73be9f99eabda2e26e9db41eAffected
LinuxLinux	4.1Affected before 4.1Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.54 through 6.18.Not affected 7.2.8 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before b0b32d3f163d24ea7134380666193bf398e9dc0bAffected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before f6b34a7d64324faf28eedc0f8678b0f832f1cc36Affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 304a874670a0b6ab5589a7f60b4af0251797b121Affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08Affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 3d76b45e8432c0d75fcb9e90d92eaa3176898adfAffected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 4b54d01b48445b66c9e576de92b90a3a3ae7b34aAffected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 875835377d8d62c849b4eb03a7abfafa71d7668fAffected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 to before 4504f3960dc4501c73be9f99eabda2e26e9db41eAffected

LinuxLinux

4.1Affected
before 4.1Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.54 through 6.18.*Not affected
7.2.8 through 7.2.*Not affected
7.3 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.