CVE-2026-98422 is a vulnerability in Linux Kernel
Published on October 14, 2026
wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown
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.
Products Associated with CVE-2026-98422
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Affected Versions
Linux:- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below b0b32d3f163d24ea7134380666193bf398e9dc0b is affected.
- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below f6b34a7d64324faf28eedc0f8678b0f832f1cc36 is affected.
- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below 304a874670a0b6ab5589a7f60b4af0251797b121 is affected.
- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08 is affected.
- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below 3d76b45e8432c0d75fcb9e90d92eaa3176898adf is affected.
- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below 4b54d01b48445b66c9e576de92b90a3a3ae7b34a is affected.
- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below 875835377d8d62c849b4eb03a7abfafa71d7668f is affected.
- Version f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 and below 4504f3960dc4501c73be9f99eabda2e26e9db41e is affected.
- Version 4.1 is affected.
- Before 4.1 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.