CVE-2026-98422
Published Oct 14, 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.
Is your site exposed to CVE-2026-98422?
Run a free security scan — no signup, results in seconds.
References
Other References
https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121
https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf
https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e
https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a
https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08
https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f
https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b
https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36
Frequently Asked Questions
What is CVE-2026-98422? +
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.
How do I check if I'm vulnerable to CVE-2026-98422? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.