Linux Kernel: Zen1 HW Divider Leakage via FPDSS
CVE-2026-31628 Published on April 24, 2026
x86/CPU: Fix FPDSS on Zen1
In the Linux kernel, the following vulnerability has been resolved:
x86/CPU: Fix FPDSS on Zen1
Zen1's hardware divider can leave, under certain circumstances, partial
results from previous operations. Those results can be leaked by
another, attacker thread.
Fix that with a chicken bit.
Products Associated with CVE-2026-31628
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 0548529af20e68c6552817834b766646dd3bd7a7 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 1272cfedf4cd1019ddf583917a99b62f2d3645bb is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 91f02726b2203b71545713ecb7fb006e60a2d66f is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below b731aca06387b195058a9f6449a03b62efa1bd10 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below ad17f07e95e6e8505e2153e5b391f0d27eacce25 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below e6af5286efe5a56128b34032572c9ce9ebeccda3 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 546785c719418c6166834a47e372a88f5f7ae893 is affected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.169, <= 6.1.* is unaffected.
- Version 6.6.135, <= 6.6.* is unaffected.
- Version 6.12.82, <= 6.12.* is unaffected.
- Version 6.18.23, <= 6.18.* is unaffected.
- Version 6.19.13, <= 6.19.* is unaffected.
- Version 7.0.1, <= 7.0.* is unaffected.