Use-after-free in Linux kernel - CVE-2026-53247
Published: June 26, 2026
Vulnerability identifier: #VU135512
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53247
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the mtk_eth_soc driver metadata dst teardown path when tearing down the device while packets still hold a non-refcounted pointer to metadata_dst. A local user can trigger the teardown condition to cause a denial of service.
The issue arises in the RX path because skb_dst_set_noref() requires RCU read-side protection and the destination object must remain valid until all RCU readers have completed.
Affected software
Linux kernel
Ubuntu
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-aws-7.0 (Ubuntu package)
Ubuntu
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-aws-7.0 (Ubuntu package)
How to mitigate CVE-2026-53247
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 6.8.0-138.138+fips1, 6.8.0-1035.36, 6.8.0-1048.52, 6.8.0-1060.63.1, 6.8.0-1063.66, 6.8.0-1063.66+fips1, 6.8.0-1065.73~22.04.1, 6.8.0-1066.74, 6.8.0-1066.74+fips1, 6.8.0-1066.74~22.04.1, 6.8.1-1058.59, 6.8.1-1058.59~22.04.1, 7.0.0-29.29, 7.0.0-29.29.1, 7.0.0-1009.9, 7.0.0-1010.10, 7.0.0-1011.11, 7.0.0-1016.16
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1010.10
linux-aws-7.0 (Ubuntu package) - update to 7.0.0-1010.10~24.04.1
linux (Ubuntu package) - addressed in versions 6.8.0-138.138+fips1, 6.8.0-1035.36, 6.8.0-1048.52, 6.8.0-1060.63.1, 6.8.0-1063.66, 6.8.0-1063.66+fips1, 6.8.0-1065.73~22.04.1, 6.8.0-1066.74, 6.8.0-1066.74+fips1, 6.8.0-1066.74~22.04.1, 6.8.1-1058.59, 6.8.1-1058.59~22.04.1, 7.0.0-29.29, 7.0.0-29.29.1, 7.0.0-1009.9, 7.0.0-1010.10, 7.0.0-1011.11, 7.0.0-1016.16
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1010.10
linux-aws-7.0 (Ubuntu package) - update to 7.0.0-1010.10~24.04.1
External References
- https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1
- https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e
- https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4
- https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751
- https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3