CVE-2025-38488

HIGH EPSS 19.6%
Published Jul 28, 202511mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
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Published Jul 28, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free in crypt_message when using async crypto The CVE-2024-50047 fix removed asynchronous crypto handling from crypt_message(), assuming all crypto operations are synchronous. However, when hardware crypto accelerators are used, this can cause use-after-free crashes: crypt_message() // Allocate the creq buffer containing the req creq = smb2_get_aead_req(..., &req); // Async encryption returns -EINPROGRESS immediately rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req); // Free creq while async operation is still in progress kvfree_sensitive(creq, ...); Hardware crypto modules often implement async AEAD operations for performance. When crypto_aead_encrypt/decrypt() returns -EINPROGRESS, the operation completes asynchronously. Without crypto_wait_req(), the function immediately frees the request buffer, leading to crashes when the driver later accesses the freed memory. This results in a use-after-free condition when the hardware crypto driver later accesses the freed request structure, leading to kernel crashes with NULL pointer dereferences. The issue occurs because crypto_alloc_aead() with mask=0 doesn't guarantee synchronous operation. Even without CRYPTO_ALG_ASYNC in the mask, async implementations can be selected. Fix by restoring the async crypto handling: - DECLARE_CRYPTO_WAIT(wait) for completion tracking - aead_request_set_callback() for async completion notification - crypto_wait_req() to wait for operation completion This ensures the request buffer isn't freed until the crypto operation completes, whether synchronous or asynchronous, while preserving the CVE-2024-50047 fix.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
19.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 13

VendorProductVersionRange
linuxlinux_kernel*≥5.10.237  –  <5.10.241
linuxlinux_kernel*≥5.15.181  –  <5.15.190
linuxlinux_kernel*≥6.1.128  –  <6.1.147
linuxlinux_kernel*≥6.6.57  –  <6.6.100
linuxlinux_kernel*≥6.11.4  –  <6.12.40
linuxlinux_kernel*≥6.13  –  <6.15.8
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
debiandebian_linux11.0any

References 9

  • git.kernel.org https://git.kernel.org/stable/c/15a0a5de49507062bc3be4014a403d8cea5533de
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2a76bc2b24ed889a689fb1c9015307bf16aafb5b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5d047b12f86cc3b9fde1171c02d9bccf4dba0632
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6550b2bef095d0dd2d2c8390d2ea4c3837028833
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8ac90f6824fc44d2e55a82503ddfc95defb19ae0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9a1d3e8d40f151c2d5a5f40c410e6e433f62f438
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b220bed63330c0e1733dc06ea8e75d5b9962b6b6
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Third Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/15a0a5de49507062bc3be4014a403d8cea5533de
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2a76bc2b24ed889a689fb1c9015307bf16aafb5b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5d047b12f86cc3b9fde1171c02d9bccf4dba0632
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6550b2bef095d0dd2d2c8390d2ea4c3837028833
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8ac90f6824fc44d2e55a82503ddfc95defb19ae0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9a1d3e8d40f151c2d5a5f40c410e6e433f62f438
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b220bed63330c0e1733dc06ea8e75d5b9962b6b6
    Patch