CVE-2025-39702 — Observable Discrepancy in Linux

CWE-203 — Observable DiscrepancyCWE-208 — Observable Timing Discrepancy30 documents8 sources
Severity
7.0HIGHNVD
EPSS
0.0%
top 93.64%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
LinuxLinux KernelDebian Linux
Timeline
PublishedSep 5
Latest updateMar 25

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:HExploitability: 1.0 | Impact: 5.9

Affected Packages3 packages

▶NVDlinux/linux_kernel4.10 — 5.15.190+5
▶Debianlinux/linux_kernel< 5.10.249-1+3
▶CVEListV5linux/linuxbf355b8d2c30a289232042cacc1cfaea4923936c — ff55a452d56490047f5233cc48c5d933f8586884+7

Also affects: Debian Linux 11.0

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

3
GHSA
GHSA-37gv-w6h3-7hm7: In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: Fix MAC comparison to be constant-time To prevent timing attacks, MACs↗2025-09-05
▶
OSV
CVE-2025-39702: In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: Fix MAC comparison to be constant-time To prevent timing attacks, MACs n↗2025-09-05
▶
CVEList
ipv6: sr: Fix MAC comparison to be constant-time↗2025-09-05
▶

📋Vendor Advisories

26
Ubuntu
Linux kernel (Azure) vulnerabilities↗2026-03-25
▶
Ubuntu
Linux kernel (Azure) vulnerabilities↗2026-03-04
▶
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities↗2026-03-04
▶
Ubuntu
Linux kernel (Xilinx) vulnerabilities↗2026-02-24
▶
Ubuntu
Linux kernel (IBM) vulnerabilities↗2026-02-24
▶
CVE-2025-39702 — Observable Discrepancy in Linux | cvebase