High 7.8Published Sep 5, 2025

CVE-2025-39689ftrace: Also allocate and copy hash for reading of filter files

Updated under an hour ago (Oct 27, 2026, 8:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds the pointer to the global tracer hash to its iterator. Unlike the writer that allocates a copy of the hash, the reader keeps the pointer to the filter hashes. This is problematic because this pointer is static across function calls that release the locks that can update the global tracer hashes. This can cause UAF and similar bugs. Allocate and copy the hash for reading the filter files like it is done for the writers. This not only fixes UAF bugs, but also makes the code a bit simpler as it doesn't have to differentiate when to free the iterator's hash between writers and readers.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c20489dad156dd9919ebd854bbace46dbd2576a3 before 12064e1880fc9202be75ff668205b1703d92f74f; from c20489dad156dd9919ebd854bbace46dbd2576a3 before c4cd93811e038d19f961985735ef7bb128078dfb; from c20489dad156dd9919ebd854bbace46dbd2576a3 before e0b6b223167e1edde5c82edf38e393c06eda1f13; from c20489dad156dd9919ebd854bbace46dbd2576a3 before a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309; from c20489dad156dd9919ebd854bbace46dbd2576a3 before 3b114a3282ab1a12cb4618a8f45db5d7185e784a; from c20489dad156dd9919ebd854bbace46dbd2576a3 before c591ba1acd081d4980713e47869dd1cc3d963d19; from c20489dad156dd9919ebd854bbace46dbd2576a3 before 64db338140d2bad99a0a8c6a118dd60b3e1fb8cb; from c20489dad156dd9919ebd854bbace46dbd2576a3 before bfb336cf97df7b37b2b2edec0f69773e06d11955	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.12 before 5.4.297; from 5.5 before 5.10.241; from 5.11 before 5.15.190; from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4; 6.17; and 1 more ranges	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/12064e1880fc9202be75ff668205b1703d92f74f	patch
https://git.kernel.org/stable/c/c4cd93811e038d19f961985735ef7bb128078dfb	patch
https://git.kernel.org/stable/c/e0b6b223167e1edde5c82edf38e393c06eda1f13	patch
https://git.kernel.org/stable/c/a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309	patch
https://git.kernel.org/stable/c/3b114a3282ab1a12cb4618a8f45db5d7185e784a	patch
https://git.kernel.org/stable/c/c591ba1acd081d4980713e47869dd1cc3d963d19	patch
https://git.kernel.org/stable/c/64db338140d2bad99a0a8c6a118dd60b3e1fb8cb	patch
https://git.kernel.org/stable/c/bfb336cf97df7b37b2b2edec0f69773e06d11955	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	mailing-list, third-party-advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	mailing-list, third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.