Out-of-bounds write in Linux kernel - CVE-2026-53362
Published: July 7, 2026
Vulnerability identifier: #VU136961
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53362
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to corrupt kernel memory.
The vulnerability exists due to an out-of-bounds write in __ip6_append_data() when processing UDPv6 socket data with MSG_MORE and MSG_SPLICE_PAGES on the paged allocation path. A local user can send crafted data through a UDPv6 socket to corrupt kernel memory.
The issue occurs when fraggap is non-zero and the paged-allocation branch is taken, causing writes past skb->end into trailing skb_shared_info.
How to mitigate CVE-2026-53362
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/14200d435af9a9eeb444f529fc2f689a236b7962
- https://git.kernel.org/stable/c/46f201f8b4c39633a1fa3dc12459f506d470993d
- https://git.kernel.org/stable/c/6374fb9edf72c67a118a2c214a0dddd04c921e0a
- https://git.kernel.org/stable/c/65fb14cbebb0cd0eff903a22d33537ddc8b95769
- https://git.kernel.org/stable/c/736b380e28d0480c7bc3e022f1950f31fe53a7c5
- https://git.kernel.org/stable/c/e9eacf19281ea2498b36291b56c9606118c2d74e