CVE-2026-64093
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: tp_meter: directly shut down timer on cleanup
batadv_tp_sender_cleanup() was calling timer_delete_sync() followed by timer_delete() to guard against the timer handler re-arming itself between the two calls. This double-deletion hack relied on the sending status being set to 0 to suppress re-arming.
Replace both calls with a single timer_shutdown_sync(). This function both waits for any running timer callback to complete (like timer_delete_sync()) and permanently disarms the timer so it cannot be re-armed afterwards, making re-arming prevention unconditional and self-documenting.
The re-arming property is also required because otherwise:
- context 0 (batadv_tp_recv_ack()) checks in batadv_tp_reset_sender_timer() if sending is still 1 -> it is
- context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in this process forces the kthread to stop timer in batadv_tp_sender_cleanup()
- context 0 continues in batadv_tp_reset_sender_timer() and rearms the timer -> but the reference for it is already gone
No affected software listed.
- https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c
- https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e
- https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a
- https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43
- https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991
- https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a
- https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff
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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
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