CVE-2026-52919 (GCVE-0-2026-52919)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-24 07:14
VLAI
Title
batman-adv: fix tp_meter counter underflow during shutdown
Summary
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]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < e75e2ab463b5b34df6b98f94d740aff327ce9f6b (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < abae88fa254f2981d39ac003a7b302528a22af64 (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < c66d20a3ff095e3f000551d208ec2606616db15c (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < c1bac194733aabd731aafa6a01350c229e187dba (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 01cefc5923889e29dbb5f281c3d457714ceb9c00 (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 90ae3eae06b7b8ab9f6250b9497c860915b4c17b (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < aeae11c5dad9cd0d50723890bdd866f8e6db2e7d (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 94f3b133168d1c49895e7cc6afbcf1cc0b354602 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix tp_meter counter underflow during shutdown\n\nbatadv_tp_sender_shutdown() unconditionally decrements the \"sending\"\natomic counter. If multiple paths (e.g. timeout, user cancel, and\nnormal finish) call this function, the counter can underflow to -1.\n\nSince the sender logic treats any non-zero value as \"still sending\",\na negative value causes the sender kthread to loop indefinitely.\nThis leads to a use-after-free when the interface is removed while\nthe zombie thread is still active.\n\nFix this by using atomic_xchg() to ensure the counter only transitions\nfrom 1 to 0 once.\n\n[sven: added missing change in batadv_tp_send]"
        }
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    "datePublished": "2026-06-24T07:14:15.201Z",
    "dateReserved": "2026-06-09T07:44:35.367Z",
    "dateUpdated": "2026-06-24T07:14:15.201Z",
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