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Vulnerability record · CVE-2026-52919 · published 24 June 2026

CVE-2026-52919: Linux kernel vulnerability

Linux · Linux Kernel

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]

7.8 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-191 · CWE-191
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

Description

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-52919), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.