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CVE-2026-98422

Unknown

Last modified

CVE-2026-98422 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < b0b32d3f163d24ea7134380666193bf398e9dc0b; >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < f6b34a7d64324faf28eedc0f8678b0f832f1cc36; >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < 304a874670a0b6ab5589a7f60b4af0251797b121; >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08; >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < 3d76b45e8432c0d75fcb9e90d92eaa3176898adf; >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < 4b54d01b48445b66c9e576de92b90a3a3ae7b34a; >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < 875835377d8d62c849b4eb03a7abfafa71d7668f; >= f9dca80b98caac8b4bfb43a2edf1e9f877ccf322, < 4504f3960dc4501c73be9f99eabda2e26e9db41e
LinuxLinux4.1

References

Timeline

Published
Last Modified
Status
Received

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 severe is CVE-2026-98422?
Severity scoring for CVE-2026-98422 is pending analysis.
How do I fix CVE-2026-98422?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST