{"id":"CVE-2025-40236","state":"PUBLISHED","title":"virtio-net: zero unused hash fields","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: zero unused hash fields\n\nWhen GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to\ninitialize the tunnel metadata but forget to zero unused rxhash\nfields. This may leak information to another side. Fixing this by\nzeroing the unused hash fields.","publishedAt":"2025-12-04T15:31:26.497Z","updatedAt":"2026-05-11T21:45:25.578Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a2fb4bc4e2a6a031683910d85b278c1d25ae5420","status":"affected","lessThan":"b625d231c66a6041e98817ffc944bf6e4c45b2e3","versionType":"git"},{"version":"a2fb4bc4e2a6a031683910d85b278c1d25ae5420","status":"affected","lessThan":"b2284768c6b32aa224ca7d0ef0741beb434f03aa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/virtio_net.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.17.6","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/virtio_net.h"]}],"references":["https://git.kernel.org/stable/c/b625d231c66a6041e98817ffc944bf6e4c45b2e3","https://git.kernel.org/stable/c/b2284768c6b32aa224ca7d0ef0741beb434f03aa"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40236.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40236","state":"PUBLISHED","datePublished":"2025-12-04T15:31:26.497Z","dateUpdated":"2026-05-11T21:45:25.578Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.180Z"},"containers":{"cna":{"title":"virtio-net: zero unused hash fields","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: zero unused hash fields\n\nWhen GSO tunnel is negotiated virtio_net_hdr_tnl_from_skb() tries to\ninitialize the tunnel metadata but forget to zero unused rxhash\nfields. This may leak information to another side. Fixing this by\nzeroing the unused hash fields."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a2fb4bc4e2a6a031683910d85b278c1d25ae5420","status":"affected","lessThan":"b625d231c66a6041e98817ffc944bf6e4c45b2e3","versionType":"git"},{"version":"a2fb4bc4e2a6a031683910d85b278c1d25ae5420","status":"affected","lessThan":"b2284768c6b32aa224ca7d0ef0741beb434f03aa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/virtio_net.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.17.6","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/virtio_net.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/b625d231c66a6041e98817ffc944bf6e4c45b2e3"},{"url":"https://git.kernel.org/stable/c/b2284768c6b32aa224ca7d0ef0741beb434f03aa"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:45:25.578Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"6.17.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}