CVE-2026-63925High· 8.1▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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).
Linux >= a21ecf0e033807b976967286e6c392f48ee2049f < dd7306779c6ce1238f4cdc34f3c1f2246b854457Linux >= a21ecf0e033807b976967286e6c392f48ee2049f < d15130461df388136b62a7b0ce9f66e7e2fa9ff1Linux >= a21ecf0e033807b976967286e6c392f48ee2049f < 23c0e230eab397d7f68be2538790ac41d3bb91fdLinux >= a21ecf0e033807b976967286e6c392f48ee2049f < 679e13a65e68a67c8b3c0467c02ee89157ec6f0fLinux >= a21ecf0e033807b976967286e6c392f48ee2049f < 79495a1b0944fe31ffd54b54b00211b493590d62Linux >= a21ecf0e033807b976967286e6c392f48ee2049f < 6d00f5c7e5ff7ec4795b7f5f8ed88bd346641652Linux >= a21ecf0e033807b976967286e6c392f48ee2049f < d55acbe577db892b60547b6ef1c020b359331a6dLinux >= a21ecf0e033807b976967286e6c392f48ee2049f < e68842b3356471ba56c882209f324613dac47f64Linux 5.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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