Linux Kernel Rust Devres Race Condition Fix
CVE-2026-89764 Published on September 11, 2026
rust: devres: fix race between concurrent revokers
In the Linux kernel, the following vulnerability has been resolved:
rust: devres: fix race between concurrent revokers
There is a potential race condition when two paths try to revoke a
Devres concurrently.
The driver core's devres_release_all() calls Revocable::revoke() via the
release callback, while Devres::drop() calls revoke_nosync() on another
CPU.
The revoker that does not claim the is_available swap returns
immediately, but the revoker that did may still be executing
drop_in_place() on the inner data. This can cause a use-after-free when
the other revoker's caller proceeds to drop adjacent resources that
drop_in_place() still references (e.g., Devres<DmaMappedSgt> racing with
SGTable freeing the backing sg_table and pages).
Fix this by adding a Completion. The release callback signals the
Completion after revoke() finishes, and Devres::drop() waits for it when
it loses the is_available swap. This ensures the wrapped object is fully
torn down before Devres::drop() returns.
Products Associated with CVE-2026-89764
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Affected Versions
Linux:- Version 05aa6fb1c21d7fb9df735da24096d793223789d5 and below c7e3d57c705ab1053a6a1bbef96795e792da1540 is affected.
- Version 05aa6fb1c21d7fb9df735da24096d793223789d5 and below acc516dfa1972d31836b50abc0115216cd0fccc5 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.