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CVE-2026-98422— wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： wifi: mac80211：在接口关闭（ifdown）时重置 AP_VLAN 的尾部空间计数器 当启用接口（ifup）时，AP_VLAN 接口会从主 AP 接口获取 值。但在接口保持开启期间，该计数器只有在 AP 接口也关闭时才会被递减。因此，如果再次启用同一个 AP_VLAN 接口，计数器会再次递增，最终触发完整性检查警告： 为了解决该问题，需在接口关闭（ifdown）时将计数器重置，从而避免此类问题发生。

AI Predicted 5.0 Difficulty: Easy EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< b0b32d3f163d24ea7134380666193bf398e9dc0b affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< f6b34a7d64324faf28eedc0f8678b0f832f1cc36 affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< 304a874670a0b6ab5589a7f60b4af0251797b121 affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< 7775759e3cb35ef5a571b2d877c2a9b70a5d5f08 affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< 3d76b45e8432c0d75fcb9e90d92eaa3176898adf affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< 4b54d01b48445b66c9e576de92b90a3a3ae7b34a affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< 875835377d8d62c849b4eb03a7abfafa71d7668f affected
f9dca80b98caac8b4bfb43a2edf1e9f877ccf322< 4504f3960dc4501c73be9f99eabda2e26e9db41e affected
… +10 more rows
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I. Basic Information for CVE-2026-98422

Vulnerability Information
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Vulnerability Title
wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f9dca80b98caac8b4bfb43a2edf1e9f877ccf322 ~ b0b32d3f163d24ea7134380666193bf398e9dc0b -
Linux Linux 4.1 -

II. Public POCs for CVE-2026-98422

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III. Intelligence Information for CVE-2026-98422

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Other References for CVE-2026-98422 (7)

Same Patch Batch · Linux · 2026-10-14 · 46 CVEs total

CVE-2026-98398 locking/lockdep: Invalidate stale class_cache entries for zapped classes
CVE-2026-98396 powerpc: Do not restore KUAP in arch_exit_to_user_mode_prepare()
CVE-2026-98393 net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
CVE-2026-98391 drm/xe: Guard page-fault worker with runtime PM check
CVE-2026-98389 drm/amdgpu: skip gfx switch_power_profile during GPU reset
CVE-2026-98388 exec: do_close_on_exec() before taking exec_update_lock
CVE-2026-98387 s390/crypto: Fix skcipher_walk return code handling in aes_s390
CVE-2026-98386 scsi: qla2xxx: Use memset_io() to clear QLAFX00 request ring slot
CVE-2026-98390 x86/amd_node: Avoid divide by zero on virtualized systems
CVE-2026-98397 platform/x86: x86-android-tablets: hold device reference for secondary fwnode teardown
CVE-2026-98395 powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit
CVE-2026-98399 s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
CVE-2026-98400 s390/ipl: Fix NULL deref in kdump without re-IPL parm block
CVE-2026-98402 net: icmp: avoid invalid transport header access in icmp_send tracepoint
CVE-2026-98401 net: iptunnel: fix stale transport header during tunnel decapsulation
CVE-2026-98403 s390/boot: Avoid IPL parameter append past command line
CVE-2026-98404 drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create()
CVE-2026-98405 smb: client: fix missing iov bounds check in parse_posix_sids()
CVE-2026-98406 wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver
CVE-2026-98408 watchdog: rzv2h: Avoid division by zero

Showing top 20 of 46 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98422

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