CVE-2026-63925
CVE CVE-2026-63925EUVD EUVD-2026-45698Published 2026-07-19T14:55:26.000ZLast changed 2026-08-05T12:37:20.000ZCVSS 8.1
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: macsec: fix replay protection at XPN lower-PN wrap In macsec_post_decrypt(), when pn is U32_MAX, pn + 1 overflows u32 to 0 and the first branch never fires. If next_pn_halves.lower is also in the upper half, pn_same_half(pn, lower) is true and the XPN else-if does not fire either, leaving next_pn_halves unchanged. An attacker that captures the legitimate frame carrying pn == 0xFFFFFFFF on an XPN association can then replay it indefinitely, since lowest_pn never rises above the captured pn and macsec_decrypt() reconstructs the same IV. Extend the XPN else-if to also fire when pn + 1 wraps to 0, so receipt of pn == U32_MAX advances next_pn_halves to (upper + 1, 0).
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 0; a21ecf0e033807b976967286e6c392f48ee2049f <e68842b3356471ba56c882209f324613dac47f64; a21ecf0e033807b976967286e6c392f48ee2049f <d15130461df388136b62a7b0ce9f66e7e2fa9ff1; 5.7; patch: 7.0.12; patch: 5.15.210; patch: 6.1.176; a21ecf0e033807b976967286e6c392f48ee2049f <23c0e230eab397d7f68be2538790ac41d3bb91fd; a21ecf0e033807b976967286e6c392f48ee2049f <6d00f5c7e5ff7ec4795b7f5f8ed88bd346641652; patch: 6.12.93; a21ecf0e033807b976967286e6c392f48ee2049f <79495a1b0944fe31ffd54b54b00211b493590d62; a21ecf0e033807b976967286e6c392f48ee2049f <d55acbe577db892b60547b6ef1c020b359331a6d; patch: 6.18.35; patch: 6.6.143; a21ecf0e033807b976967286e6c392f48ee2049f <679e13a65e68a67c8b3c0467c02ee89157ec6f0f; a21ecf0e033807b976967286e6c392f48ee2049f <dd7306779c6ce1238f4cdc34f3c1f2246b854457; patch: 7.1; patch: 5.10.259
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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