batman-adv: fix tp_meter counter underflow during shutdown
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]
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.258, 5.15.209, 6.1.175, 6.12.92, 6.18.34, 6.6.142, 7.0.11
- CVEs
- CVE-2026-52919
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 12:44 UTC · Revision 1
Source evidence
batman-adv: fix tp_meter counter underflow during shutdown
core-osv · Original sourcePublished 24 Jun 2026, 07:14 UTC
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]
osv:CVE-2026-52919
Kernel
Fixed versions: 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11
Complete source record
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"id": "a3f2635ff01b03273261e2489c9cf42103fce76271a47a6ad65bf5423465ba3c",
"url": "https://osv.dev/vulnerability/CVE-2026-52919",
"method": "structured",
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"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]",
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"modified": "2026-10-28T02:30:28.984025282Z",
"provider": "osv",
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"source_id": "core-osv",
"document_id": 495547,
"published_at": "2026-06-24T07:14:15.201+00:00"
}