net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown

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Summary

CVECVE-2026-53247
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:42 UTC
Updated2026-06-25 09:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown mtk_free_dev() calls metadata_dst_free() which frees the metadata_dst with kfree() immediately, bypassing the RCU grace period. In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from the skb to the metadata_dst. This function requires RCU read-side protection and the dst must remain valid until all RCU readers complete. Since metadata_dst_free() calls kfree() directly, a use-after-free can occur if any skb still holds a noref pointer to the dst when the driver tears it down. Replace metadata_dst_free() with dst_release() which properly goes through the refcount path: when the refcount drops to zero, it schedules the actual free via call_rcu_hurry(), ensuring all RCU readers have completed before the memory is freed.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2d7605a729062bb554f03c5983d8cfb8c0b42e9c 72775977e89c25c99ee84d2c5baa3f86a8ba5cb4 git Not specified
CNA Linux Linux affected 2d7605a729062bb554f03c5983d8cfb8c0b42e9c 459c6f35c58cf0fd5247e55d73ddaa29571d9b7e git Not specified
CNA Linux Linux affected 2d7605a729062bb554f03c5983d8cfb8c0b42e9c e634408d2b0cd939cfe019398a21fb47b7a8ffe3 git Not specified
CNA Linux Linux affected 2d7605a729062bb554f03c5983d8cfb8c0b42e9c 2d86aeb46d5f69c704065a8c69822582787272a1 git Not specified
CNA Linux Linux affected 2d7605a729062bb554f03c5983d8cfb8c0b42e9c 80df409e1a483676826a6c66e693dba6ac507751 git Not specified
CNA Linux Linux affected 6.2 Not specified
CNA Linux Linux unaffected 6.2 semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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