CVE-2026-53247net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
Updated under an hour ago ()
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2d7605a729062bb554f03c5983d8cfb8c0b42e9c before 72775977e89c25c99ee84d2c5baa3f86a8ba5cb4; from 2d7605a729062bb554f03c5983d8cfb8c0b42e9c before 459c6f35c58cf0fd5247e55d73ddaa29571d9b7e; from 2d7605a729062bb554f03c5983d8cfb8c0b42e9c before e634408d2b0cd939cfe019398a21fb47b7a8ffe3; 2d7605a729062bb554f03c5983d8cfb8c0b42e9c builds before 2d86aeb46d5f69c704065a8c69822582787272a1; from 2d7605a729062bb554f03c5983d8cfb8c0b42e9c before 80df409e1a483676826a6c66e693dba6ac507751 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1; 7.1; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4patch
- https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7epatch
- https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3patch
- https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1patch
- https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.