High 7.8Published Jun 24, 2026

CVE-2026-52919batman-adv: fix tp_meter counter underflow during shutdown

Updated under an hour ago (Oct 27, 2026, 7:00 PM ET)

Does this affect you?

It affects Linux and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix tp_meter counter underflow during shutdown batadv_tp_sender_shutdown() unconditionally decrements the "sending" atomic counter. If multiple paths (e.g. timeout, user cancel, and normal finish) call this function, the counter can underflow to -1. Since the sender logic treats any non-zero value as "still sending", a negative value causes the sender kthread to loop indefinitely. This leads to a use-after-free when the interface is removed while the zombie thread is still active. Fix this by using atomic_xchg() to ensure the counter only transitions from 1 to 0 once. [sven: added missing change in batadv_tp_send]

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before e75e2ab463b5b34df6b98f94d740aff327ce9f6b; from 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before abae88fa254f2981d39ac003a7b302528a22af64; from 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before c66d20a3ff095e3f000551d208ec2606616db15c; from 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before c1bac194733aabd731aafa6a01350c229e187dba; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e builds before 01cefc5923889e29dbb5f281c3d457714ceb9c00; from 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before 90ae3eae06b7b8ab9f6250b9497c860915b4c17b; from 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before aeae11c5dad9cd0d50723890bdd866f8e6db2e7d; from 33a3bb4a3345bb511f9c69c913da95d4693e2a4e before 94f3b133168d1c49895e7cc6afbcf1cc0b354602	CNA record
linux linux_kernel linux:linux_kernel	from 4.8 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/e75e2ab463b5b34df6b98f94d740aff327ce9f6b	patch
https://git.kernel.org/stable/c/abae88fa254f2981d39ac003a7b302528a22af64	patch
https://git.kernel.org/stable/c/c66d20a3ff095e3f000551d208ec2606616db15c	patch
https://git.kernel.org/stable/c/c1bac194733aabd731aafa6a01350c229e187dba	patch
https://git.kernel.org/stable/c/01cefc5923889e29dbb5f281c3d457714ceb9c00	patch
https://git.kernel.org/stable/c/90ae3eae06b7b8ab9f6250b9497c860915b4c17b	patch
https://git.kernel.org/stable/c/aeae11c5dad9cd0d50723890bdd866f8e6db2e7d	patch
https://git.kernel.org/stable/c/94f3b133168d1c49895e7cc6afbcf1cc0b354602	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.