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CVE-2026-98422

wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in b0b32d3f163d24ea7134380666193bf398e9dc0b; From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in f6b34a7d64324faf28eedc0f8678b0f832f1cc36; From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in 304a874670a0b6ab5589a7f60b4af0251797b121; From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08; From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in 3d76b45e8432c0d75fcb9e90d92eaa3176898adf; From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in 4b54d01b48445b66c9e576de92b90a3a3ae7b34a; From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in 875835377d8d62c849b4eb03a7abfafa71d7668f; From f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 · fixed in 4504f3960dc4501c73be9f99eabda2e26e9db41e

  • Linux Linux

    4.1

  • KernelLinux

    From 4.1.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8

git.kernel.org