CVE-2026-53247 is a vulnerability in Linux Kernel
Published on June 25, 2026
net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
In 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.
Products Associated with CVE-2026-53247
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Affected Versions
Linux:- Version 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and below 72775977e89c25c99ee84d2c5baa3f86a8ba5cb4 is affected.
- Version 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and below 459c6f35c58cf0fd5247e55d73ddaa29571d9b7e is affected.
- Version 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and below e634408d2b0cd939cfe019398a21fb47b7a8ffe3 is affected.
- Version 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and below 2d86aeb46d5f69c704065a8c69822582787272a1 is affected.
- Version 2d7605a729062bb554f03c5983d8cfb8c0b42e9c and below 80df409e1a483676826a6c66e693dba6ac507751 is affected.
- Version 6.2 is affected.
- Before 6.2 is unaffected.
- Version 6.6.143, <= 6.6.* is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.