From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2025-39702: ipv6: sr: Fix MAC comparison to be constant-time
Date: Fri, 5 Sep 2025 19:21:15 +0200 [thread overview]
Message-ID: <2025090548-CVE-2025-39702-cb30@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
ipv6: sr: Fix MAC comparison to be constant-time
To prevent timing attacks, MACs need to be compared in constant time.
Use the appropriate helper function for this.
The Linux kernel CVE team has assigned CVE-2025-39702 to this issue.
Affected and fixed versions
===========================
Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 5.15.190 with commit 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0
Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 6.1.149 with commit 86b6d34717fe0570afce07ee79b8eeb40341f831
Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 6.6.103 with commit 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3
Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 6.12.44 with commit b3967c493799e63f648e9c7b6cb063aa2aed04e7
Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 6.16.4 with commit f7878d47560d61e3f370aca3cebb8f42a55b990a
Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 6.17-rc3 with commit a458b2902115b26a25d67393b12ddd57d1216aaa
Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.
Unaffected versions might change over time as fixes are backported to
older supported kernel versions. The official CVE entry at
https://cve.org/CVERecord/?id=CVE-2025-39702
will be updated if fixes are backported, please check that for the most
up to date information about this issue.
Affected files
==============
The file(s) affected by this issue are:
net/ipv6/seg6_hmac.c
Mitigation
==========
The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes. Individual
changes are never tested alone, but rather are part of a larger kernel
release. Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all. If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
https://git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0
https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831
https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3
https://git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7
https://git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a
https://git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa
reply other threads:[~2025-09-05 17:23 UTC|newest]
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