CVE-2026-98422
wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown
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.
INFO
Published Date :
Oct. 14, 2026, 2:17 p.m.
Last Modified :
Oct. 14, 2026, 2:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest stable version.
- Apply the specific patch for wifi: mac80211 reset.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-98422.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-98422 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-98422
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-98422 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-98422 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 14, 2026
Action Type Old Value New Value Added 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/98xxx/CVE-2026-98422.json">CVE-2026-98422</a> Added Reference https://git.kernel.org/stable/c/304a874670a0b6ab5589a7f60b4af0251797b121 Added Reference https://git.kernel.org/stable/c/3d76b45e8432c0d75fcb9e90d92eaa3176898adf Added Reference https://git.kernel.org/stable/c/4504f3960dc4501c73be9f99eabda2e26e9db41e Added Reference https://git.kernel.org/stable/c/4b54d01b48445b66c9e576de92b90a3a3ae7b34a Added Reference https://git.kernel.org/stable/c/7775759e3cb35ef5a571b2d877c2a9b70a5d5f08 Added Reference https://git.kernel.org/stable/c/875835377d8d62c849b4eb03a7abfafa71d7668f Added Reference https://git.kernel.org/stable/c/b0b32d3f163d24ea7134380666193bf398e9dc0b Added Reference https://git.kernel.org/stable/c/f6b34a7d64324faf28eedc0f8678b0f832f1cc36