PT-2026-61410 · Linux · Linux

CVE-2026-64093 · Published 2026-07-19 · Updated 2026-07-19

NVD

CVSS v3.1

8.8

High

Base vector

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

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:

1. context 0 (batadv tp recv ack()) checks in batadv tp reset sender timer() if sending is still 1 -> it is
2. 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()
3. context 0 continues in batadv tp reset sender timer() and rearms the timer -> but the reference for it is already gone

Fix

Related Identifiers

CVE-2026-64093

Affected Products

Linux

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-64093 · Security Note
• https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a · Note
• https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991 · Note
• https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e · Note
• https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff · Note
• https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a · Note
• https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43 · Note
• https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c · Note