{"id":"CVE-2026-43107","state":"PUBLISHED","title":"xfrm: account XFRMA_IF_ID in aevent size calculation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: account XFRMA_IF_ID in aevent size calculation\n\nxfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then\nbuild_aevent() appends attributes including XFRMA_IF_ID when x->if_id is\nset.\n\nxfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states\nwith if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0)\nin xfrm_get_ae(), turning a malformed netlink interaction into a kernel\npanic.\n\nAccount XFRMA_IF_ID in the size calculation unconditionally and replace\nthe BUG_ON with normal error unwinding.","publishedAt":"2026-05-06T07:40:35.068Z","updatedAt":"2026-10-30T12:24:57.315Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"b7dbdc34d22f743abb2c460dfae0d69cd8a45e69","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"f8f3bb89ab677db15f9f5250c77af728f9afe995","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"2c41283d94af943a05f7f2cc1a01f0c872f3cf43","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"e62e322ea20be78e346e4b49f9a6b9f03313af4c","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"58e5735d1a5373652f405a0c16e54ac04aaab0ad","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"7081d46d32312f1a31f0e0e99c6835a394037599","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":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","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/b7dbdc34d22f743abb2c460dfae0d69cd8a45e69","https://git.kernel.org/stable/c/f8f3bb89ab677db15f9f5250c77af728f9afe995","https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43","https://git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c","https://git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0ad","https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599"],"weaknesses":[],"ingestedAt":"2026-10-30T12:42:04.495Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43107.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43107","state":"PUBLISHED","datePublished":"2026-05-06T07:40:35.068Z","dateUpdated":"2026-10-30T12:24:57.315Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.986Z"},"containers":{"cna":{"title":"xfrm: account XFRMA_IF_ID in aevent size calculation","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: account XFRMA_IF_ID in aevent size calculation\n\nxfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then\nbuild_aevent() appends attributes including XFRMA_IF_ID when x->if_id is\nset.\n\nxfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states\nwith if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0)\nin xfrm_get_ae(), turning a malformed netlink interaction into a kernel\npanic.\n\nAccount XFRMA_IF_ID in the size calculation unconditionally and replace\nthe BUG_ON with normal error unwinding."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"b7dbdc34d22f743abb2c460dfae0d69cd8a45e69","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"f8f3bb89ab677db15f9f5250c77af728f9afe995","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"2c41283d94af943a05f7f2cc1a01f0c872f3cf43","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"e62e322ea20be78e346e4b49f9a6b9f03313af4c","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"58e5735d1a5373652f405a0c16e54ac04aaab0ad","versionType":"git"},{"version":"7e6526404adedf079279aa7aa11722deaca8fe2e","status":"affected","lessThan":"7081d46d32312f1a31f0e0e99c6835a394037599","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":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","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":[{"url":"https://git.kernel.org/stable/c/b7dbdc34d22f743abb2c460dfae0d69cd8a45e69"},{"url":"https://git.kernel.org/stable/c/f8f3bb89ab677db15f9f5250c77af728f9afe995"},{"url":"https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43"},{"url":"https://git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c"},{"url":"https://git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0ad"},{"url":"https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:24:57.315Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}