batman-adv: tp_meter: directly shut down timer on cleanup

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64093
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:50 UTC
Updated2026-07-20 15:17:08 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002050000 probability, percentile 0.107230000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c git Not specified
CNA Linux Linux affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 74a76634055462833446684fd526d73c290ea43a git Not specified
CNA Linux Linux affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 5bc2d50fb66b46f86543d5153a188eb1486d0b6e git Not specified
CNA Linux Linux affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e f86b20ec8d17d77bddc02c5c86cfa2389d84ecff git Not specified
CNA Linux Linux affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 770bf0a35f0620b526fd4193889d1e77084e4c43 git Not specified
CNA Linux Linux affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 933880a8bc9b4042223a79255c0b1021cdc36991 git Not specified
CNA Linux Linux affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e d5487249a81ea658717614009c8f46acc5b7101a git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 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

ReferenceSourceLinkTags
git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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