Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.2, < 6.6.143 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1Patch
- https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7ePatch
- https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4Patch
- https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751Patch
- https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3Patch
FAQ
What is CVE-2026-53247?
CVE-2026-53247 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 m...
How severe is CVE-2026-53247?
CVE-2026-53247 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-53247?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.