CVE-2025-38571

MEDIUM EPSS 4.3%
Published Aug 19, 202510mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
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Published Aug 19, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix client side handling of tls alerts A security exploit was discovered in NFS over TLS in tls_alert_recv due to its assumption that there is valid data in the msghdr's iterator's kvec. Instead, this patch proposes the rework how control messages are setup and used by sock_recvmsg(). If no control message structure is setup, kTLS layer will read and process TLS data record types. As soon as it encounters a TLS control message, it would return an error. At that point, NFS can setup a kvec backed control buffer and read in the control message such as a TLS alert. Scott found that a msg iterator can advance the kvec pointer as a part of the copy process thus we need to revert the iterator before calling into the tls_alert_recv.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥6.5  –  <6.6.102
linuxlinux_kernel*≥6.7  –  <6.12.42
linuxlinux_kernel*≥6.13  –  <6.15.10
linuxlinux_kernel*≥6.16  –  <6.16.1

References 5

  • git.kernel.org https://git.kernel.org/stable/c/3ee397eaaca4fa04db21bb98c8f1d0c6cc525368
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3feada5baf4dc96e151ff2ca54630e1d274e5458
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a55b3d15331859d9fdd261cfa6d34ca2aeb0fb95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c36b2fbd60e8f9c6f975522130998608880c93be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc5d59081fa26506d02de2127ab822f40d88bc5a
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3ee397eaaca4fa04db21bb98c8f1d0c6cc525368
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3feada5baf4dc96e151ff2ca54630e1d274e5458
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a55b3d15331859d9fdd261cfa6d34ca2aeb0fb95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c36b2fbd60e8f9c6f975522130998608880c93be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc5d59081fa26506d02de2127ab822f40d88bc5a
    Patch