{"id":"CVE-2026-31482","state":"PUBLISHED","title":"s390/entry: Scrub r12 register on kernel entry","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/entry: Scrub r12 register on kernel entry\n\nBefore commit f33f2d4c7c80 (\"s390/bp: remove TIF_ISOLATE_BP\"),\nall entry handlers loaded r12 with the current task pointer\n(lg %r12,__LC_CURRENT) for use by the BPENTER/BPEXIT macros. That\ncommit removed TIF_ISOLATE_BP, dropping both the branch prediction\nmacros and the r12 load, but did not add r12 to the register clearing\nsequence.\n\nAdd the missing xgr %r12,%r12 to make the register scrub consistent\nacross all entry points.","publishedAt":"2026-04-22T13:54:08.888Z","updatedAt":"2026-05-11T22:09:35.182Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"a58d298a83a3a9b7ca99ded9d60a1e77231159ef","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"95c899cd791803a5bf7b73e5994fbbe1cc1a9c36","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"7f4e3233faa8470dd0627bc49b2809f2bfebd909","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"99a8b420f3f0e162eb9c9c9253929d4d23f9bd30","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"0738d395aab8fae3b5a3ad3fc640630c91693c27","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kernel/entry.S"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kernel/entry.S"]}],"references":["https://git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef","https://git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36","https://git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909","https://git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30","https://git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31482.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31482","state":"PUBLISHED","datePublished":"2026-04-22T13:54:08.888Z","dateUpdated":"2026-05-11T22:09:35.182Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.101Z"},"containers":{"cna":{"title":"s390/entry: Scrub r12 register on kernel entry","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/entry: Scrub r12 register on kernel entry\n\nBefore commit f33f2d4c7c80 (\"s390/bp: remove TIF_ISOLATE_BP\"),\nall entry handlers loaded r12 with the current task pointer\n(lg %r12,__LC_CURRENT) for use by the BPENTER/BPEXIT macros. That\ncommit removed TIF_ISOLATE_BP, dropping both the branch prediction\nmacros and the r12 load, but did not add r12 to the register clearing\nsequence.\n\nAdd the missing xgr %r12,%r12 to make the register scrub consistent\nacross all entry points."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"a58d298a83a3a9b7ca99ded9d60a1e77231159ef","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"95c899cd791803a5bf7b73e5994fbbe1cc1a9c36","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"7f4e3233faa8470dd0627bc49b2809f2bfebd909","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"99a8b420f3f0e162eb9c9c9253929d4d23f9bd30","versionType":"git"},{"version":"f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780","status":"affected","lessThan":"0738d395aab8fae3b5a3ad3fc640630c91693c27","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kernel/entry.S"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.131","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.80","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.21","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.11","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kernel/entry.S"]}],"references":[{"url":"https://git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef"},{"url":"https://git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36"},{"url":"https://git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909"},{"url":"https://git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30"},{"url":"https://git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:09:35.182Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}