batman-adv: fix tp_meter counter underflow during shutdown
Summary
| CVE | CVE-2026-52919 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-24 08:16:21 UTC |
| Updated | 2026-06-24 08:16:21 UTC |
| 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] |
Risk And Classification
EPSS: 0.001640000 probability, percentile 0.059630000 (date 2026-06-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e e75e2ab463b5b34df6b98f94d740aff327ce9f6b git | Not specified |
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e abae88fa254f2981d39ac003a7b302528a22af64 git | Not specified |
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e c66d20a3ff095e3f000551d208ec2606616db15c git | Not specified |
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e c1bac194733aabd731aafa6a01350c229e187dba git | Not specified |
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 01cefc5923889e29dbb5f281c3d457714ceb9c00 git | Not specified |
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 90ae3eae06b7b8ab9f6250b9497c860915b4c17b git | Not specified |
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e aeae11c5dad9cd0d50723890bdd866f8e6db2e7d git | Not specified |
| CNA | Linux | Linux | affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 94f3b133168d1c49895e7cc6afbcf1cc0b354602 git | Not specified |
| CNA | Linux | Linux | affected 4.8 | Not specified |
| CNA | Linux | Linux | unaffected 4.8 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.258 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.209 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.175 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.142 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.92 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.34 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.11 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/01cefc5923889e29dbb5f281c3d457714ceb9c00 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c66d20a3ff095e3f000551d208ec2606616db15c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/abae88fa254f2981d39ac003a7b302528a22af64 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/aeae11c5dad9cd0d50723890bdd866f8e6db2e7d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/94f3b133168d1c49895e7cc6afbcf1cc0b354602 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/90ae3eae06b7b8ab9f6250b9497c860915b4c17b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e75e2ab463b5b34df6b98f94d740aff327ce9f6b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c1bac194733aabd731aafa6a01350c229e187dba | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.