Vulnerability in Linux

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3951

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-98426CVE-2026-98416CVE-2026-98393+43 more CVEs

[ References ]References

• git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121
• git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf
• git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e
• git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a
• git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08
• git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f
• git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b
• git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36