CVE-2026-99203
kernel: pipe: preserve existing fasync readers on writer setup failure
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 28, 2026
Updated · November 1, 2026
Description
A flaw was found in the Linux kernel's pipe subsystem. Improper error handling during asynchronous input/output (I/O) notification setup can leave freed file structures referenced after an allocation failure. A local, unprivileged attacker could exploit this condition under memory pressure to trigger a use-after-free vulnerability, leading to a system crash and Denial of Service (DoS) or potential privilege escalation.
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 · 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-825 · Expired Pointer Dereference