High severity · published Sep 5, 2025
CVE-2025-39702
ipv6: sr: Fix MAC comparison to be constant-time
7.0
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
4.10 before 5.15.190; 5.16 before 6.1.149; 6.2 before 6.6.103; 6.7 before 6.12.44; 6.13 before 6.16.4; 6.17; +1 more · source: NVD
LI
Linux · Linux
bf355b8d2c30a289232042cacc1cfaea4923936c before ff55a452d56490047f5233cc48c5d933f8586884; bf355b8d2c30a289232042cacc1cfaea4923936c before 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0; bf355b8d2c30a289232042cacc1cfaea4923936c before 86b6d34717fe0570afce07ee79b8eeb40341f831; bf355b8d2c30a289232042cacc1cfaea4923936c before 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3; bf355b8d2c30a289232042cacc1cfaea4923936c before b3967c493799e63f648e9c7b6cb063aa2aed04e7; bf355b8d2c30a289232042cacc1cfaea4923936c before f7878d47560d61e3f370aca3cebb8f42a55b990a; +2 more · source: vendor
DL
Debian Linux · Debian
11.0 · source: NVD
SC
SIMATIC CN 4100 · Siemens
before V5.0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-39702
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-39702
Patch
https://git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0
Patch
https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3
Patch
https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831
Patch
https://git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa
Patch
https://git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7
Patch
https://git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a
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