PT-2025-31084 · Linux+5 · Linux Kernel+5
Published
2025-07-05
·
Updated
2026-05-26
·
CVE-2025-38488
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/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
A use-after-free condition exists in the SMB client within the Linux kernel's
crypt message() function when asynchronous cryptography is utilized. The initial fix for CVE-2024-50047 removed asynchronous crypto handling, assuming all crypto operations were synchronous. However, hardware crypto accelerators can still trigger asynchronous operations, leading to the premature freeing of the request buffer while the operation is still in progress. Subsequently, accessing this freed memory results in kernel crashes due to NULL pointer dereferences. The issue arises because crypto alloc aead() with a mask of 0 does not guarantee synchronous operation, and asynchronous implementations can be selected even without CRYPTO ALG ASYNC in the mask.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
Improper Resource Release
NULL Pointer Dereference
Use After Free
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Related Identifiers
Affected Products
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu