CVE-2021-47324
watchdog: Fix possible use-after-free in wdt_startup()
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Description
In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76
- https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875
- https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02
- https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685
- https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90
References (9)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
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