{"id":"CVE-2026-31671","state":"PUBLISHED","title":"xfrm_user: fix info leak in build_report()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm_user: fix info leak in build_report()\n\nstruct xfrm_user_report is a __u8 proto field followed by a struct\nxfrm_selector which means there is three \"empty\" bytes of padding, but\nthe padding is never zeroed before copying to userspace.  Fix that up by\nzeroing the structure before setting individual member variables.","publishedAt":"2026-04-24T14:45:18.669Z","updatedAt":"2026-10-15T01:17:41.666Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"d27c02eec529f78055a46a5c9e6c62684382b2d8","versionType":"git"},{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"716c546e88cfe49d841658240e10cb57bc50a2cc","versionType":"git"},{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9","versionType":"git"},{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"e0c8542c3d097ed4205ded51868195d5d6ddac62","versionType":"git"},{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"ff5ee507302303b15859753c3e0d67d38fd12c88","versionType":"git"},{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"6c55714c931051cd7f4839c19ce0867179fd22fe","versionType":"git"},{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72","versionType":"git"},{"version":"97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5","status":"affected","lessThan":"d10119968d0e1f2b669604baf2a8b5fdb72fa6b4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xfrm/xfrm_user.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.19","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.169","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.135","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.82","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.23","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.13","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":["net/xfrm/xfrm_user.c"]}],"references":["https://git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8","https://git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2cc","https://git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9","https://git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62","https://git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88","https://git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fe","https://git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72","https://git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4","https://cert-portal.siemens.com/productcert/html/ssa-082556.html","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31671.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31671","state":"PUBLISHED","datePublished":"2026-04-24T14:45:18.669Z","dateUpdated":"2026-10-15T01:17:41.666Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.130Z"},"containers":{"cna":{"title":"xfrm_user: fix info leak in build_report()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm_user: fix info leak in build_report()\n\nstruct xfrm_user_report is a __u8 proto field followed by a struct\nxfrm_selector which means there is three \"empty\" bytes of padding, but\nthe padding is never zeroed before copying to userspace.  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