{"id":"CVE-2026-23048","state":"PUBLISHED","title":"udp: call skb_orphan() before skb_attempt_defer_free()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nudp: call skb_orphan() before skb_attempt_defer_free()\n\nStandard UDP receive path does not use skb->destructor.\n\nBut skmsg layer does use it, since it calls skb_set_owner_sk_safe()\nfrom udp_read_skb().\n\nThis then triggers this warning in skb_attempt_defer_free():\n\n    DEBUG_NET_WARN_ON_ONCE(skb->destructor);\n\nWe must call skb_orphan() to fix this issue.","publishedAt":"2026-02-04T16:00:30.232Z","updatedAt":"2026-05-11T21:58:59.709Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6471658dc66c670580a7616e75f51b52917e7883","status":"affected","lessThan":"0c63d5683eae6a7b4d81382bcbecb2a19feff90d","versionType":"git"},{"version":"6471658dc66c670580a7616e75f51b52917e7883","status":"affected","lessThan":"e5c8eda39a9fc1547d1398d707aa06c1d080abdd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/udp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.6","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/udp.c"]}],"references":["https://git.kernel.org/stable/c/0c63d5683eae6a7b4d81382bcbecb2a19feff90d","https://git.kernel.org/stable/c/e5c8eda39a9fc1547d1398d707aa06c1d080abdd"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23048.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23048","state":"PUBLISHED","datePublished":"2026-02-04T16:00:30.232Z","dateUpdated":"2026-05-11T21:58:59.709Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.949Z"},"containers":{"cna":{"title":"udp: call skb_orphan() before skb_attempt_defer_free()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nudp: call skb_orphan() before skb_attempt_defer_free()\n\nStandard UDP receive path does not use skb->destructor.\n\nBut skmsg layer does use it, since it calls skb_set_owner_sk_safe()\nfrom udp_read_skb().\n\nThis then triggers this warning in skb_attempt_defer_free():\n\n    DEBUG_NET_WARN_ON_ONCE(skb->destructor);\n\nWe must call skb_orphan() to fix this issue."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6471658dc66c670580a7616e75f51b52917e7883","status":"affected","lessThan":"0c63d5683eae6a7b4d81382bcbecb2a19feff90d","versionType":"git"},{"version":"6471658dc66c670580a7616e75f51b52917e7883","status":"affected","lessThan":"e5c8eda39a9fc1547d1398d707aa06c1d080abdd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/udp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.6","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/udp.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0c63d5683eae6a7b4d81382bcbecb2a19feff90d"},{"url":"https://git.kernel.org/stable/c/e5c8eda39a9fc1547d1398d707aa06c1d080abdd"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:58:59.709Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}