CVE-2026-89764
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel's Rust devres layer, a race condition occurs when two paths concurrently revoke a Devres. 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 other may still be executing drop_in_place() on the inner data, causing a use-after-free. The fix adds a Completion that Devres::drop() waits on when it loses the is_available swap.
Risk Assessment
A use-after-free in the kernel can lead to memory corruption, system crash (panic), or potential privilege escalation. The risk affects systems using Rust devres drivers, e.g., Devres<DmaMappedSgt>.
Recommendation
Update the Linux kernel to a version containing the fix. Until then, avoid configurations where Rust devres drivers are heavily used concurrently.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS