PT-2026-52355 · Linux · Linux Kernel
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
An issue exists in the TCP implementation where a reference count underflow can occur in the
inet csk reqsk queue drop() function, potentially leading to a use-after-free condition. This occurs when PREEMPT RT is enabled and the reqsk queue hash req() function is preempted after the mod timer() call but before refcount set(). In this scenario, a timer may trigger and abort the request socket due to the listener closing, causing the request socket to miss necessary reference counts for both the ehash and the timer. The vulnerability involves the reqsk->rsk refcnt variable.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel