CVE-2025-39697: debian linux — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a race when updating an existing write After nfs_lock_and_join_requests() tests for whether the request is still attached to the mapping, nothing prevents a call to nfs_inode_remove_request() from succeeding until we actually lock the page group. The reason is that whoever called nfs_inode_remove_request() doesn't necessarily have a lock on the page group head. So in order to avoid races, let's take the page group lock earlier in nfs_lock_and_join_requests(), and hold it across the removal of the request in nfs_inode_remove_request().

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CVSS v3.1 Score

4.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-362 CWE-362

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.14 — 5.10.242
linux	linux_kernel	5.11 — 5.15.191
linux	linux_kernel	5.16 — 6.1.150
linux	linux_kernel	6.2 — 6.6.104
linux	linux_kernel	6.7 — 6.12.44
linux	linux_kernel	6.13 — 6.16.4
linux	linux_kernel	All
linux	linux_kernel	All
debian	debian_linux	All

References

Advisories & Patches

https://git.kernel.org/stable/c/0ff42a32784e0f2cb46a46da8e9f473538c13e1b https://git.kernel.org/stable/c/181feb41f0b268e6288bf9a7b984624d7fe2031d https://git.kernel.org/stable/c/202a3432d21ac060629a760fff3b0a39859da3ea https://git.kernel.org/stable/c/76d2e3890fb169168c73f2e4f8375c7cc24a765e https://git.kernel.org/stable/c/92278ae36935a54e65fef9f8ea8efe7e80481ace https://git.kernel.org/stable/c/c32e3c71aaa1c1ba05da88605e2ddd493c58794f https://git.kernel.org/stable/c/f230d40147cc37eb3aef4d50e2e2c06ea73d9a77

Other References

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html https://cert-portal.siemens.com/productcert/html/ssa-032379.html https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Frequently Asked Questions

What is CVE-2025-39697? +

In the Linux kernel, the following vulnerability has been resolved: NFS: Fix a race when updating an existing write After nfs_lock_and_join_requests() tests for whether the request is still attached to the mapping, nothing prevents a call to nfs_inode_remove_request() from succeeding until we actually lock the page group. The reason is that whoever called nfs_inode_remove_request() doesn't necessarily have a lock on the page group head. So in order to avoid races, let's take the page group lock earlier in nfs_lock_and_join_requests(), and hold it across the removal of the request in nfs_inode_remove_request(). It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2025-39697? +

CVE-2025-39697 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-39697? +

CVE-2025-39697 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-39697? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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