CVE-2026-46300
Missing Initialization of a Variable in Linux Kernel. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 28 October 2026.
- Product
- Linux Kernel
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987
- git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c
- git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5
- git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0
- git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e
- git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a
- git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111
- git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
Linux Kernel contains a missing initialization of a variable vulnerability that could allow for unintended modification of page-cache-backed data via failure to preserve the shared-fragment marker during socket buffer coalescing, causing ESP input processing to decrypt shared fragments in place. This vulnerability can be chained with CVE-2026-109618 and CVE-2026-109619 to implant PHP webshells and run commands as root.
More from Linux this year.
- CVE-2026-53266 Out-of-Bounds Write, added
- CVE-2025-39964 Race Condition, added
- CVE-2025-39682 Improper Check for Unusual or Exceptional Conditions, added
- CVE-2026-53362 Unspecified, added
- CVE-2022-0995 Out-of-Bounds Write, added
- CVE-2022-0492 Improper Authentication, added
- CVE-2026-31431 Incorrect Resource Transfer Between Spheres, added
- CVE-2018-14634 Integer Overflow, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.