CVE-2026-98844
kernel: netfs: clear post-EOF pagecache when extending a file via write
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 18, 2026
Updated · October 24, 2026
Description
A flaw was found in the Linux kernel's network filesystem (netfs) subsystem. When a file is extended through write operations after previous writes were performed via memory mapping, the system fails to clear stale cache data located beyond the original end of the file. A local user could exploit this flaw to read stale data from the newly exposed file regions, leading to information disclosure and data corruption.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE-908 · Use of Uninitialized Resource