{"api_version":"1","generated_at":"2026-04-22T17:23:54+00:00","cve":"CVE-2026-31518","urls":{"html":"https://cve.report/CVE-2026-31518","api":"https://cve.report/api/cve/CVE-2026-31518.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31518","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31518"},"summary":{"title":"esp: fix skb leak with espintcp and async crypto","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nesp: fix skb leak with espintcp and async crypto\n\nWhen the TX queue for espintcp is full, esp_output_tail_tcp will\nreturn an error and not free the skb, because with synchronous crypto,\nthe common xfrm output code will drop the packet for us.\n\nWith async crypto (esp_output_done), we need to drop the skb when\nesp_output_tail_tcp returns an error.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-22 14:16:51","updated_at":"2026-04-22 14:16:51"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4820847e036ff1035b01b69ad68dfc17e7028fe9","name":"https://git.kernel.org/stable/c/4820847e036ff1035b01b69ad68dfc17e7028fe9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aca3ad0c262f54a5b5c95dda80a48365997d1224","name":"https://git.kernel.org/stable/c/aca3ad0c262f54a5b5c95dda80a48365997d1224","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2","name":"https://git.kernel.org/stable/c/0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6a3ec6efbc4f90e0ccb2e71574f07351f19996f4","name":"https://git.kernel.org/stable/c/6a3ec6efbc4f90e0ccb2e71574f07351f19996f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/88d386243ed374ac969dabd3bbc1409a31d81818","name":"https://git.kernel.org/stable/c/88d386243ed374ac969dabd3bbc1409a31d81818","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/df6f995358dc1f3c42484f5cfe241d7bd3e1cd15","name":"https://git.kernel.org/stable/c/df6f995358dc1f3c42484f5cfe241d7bd3e1cd15","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6aa9841d917532d0f2d932d1ff2f3a94305aaf47","name":"https://git.kernel.org/stable/c/6aa9841d917532d0f2d932d1ff2f3a94305aaf47","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/41aafca57de4a4c026701622bd4648f112a9edcd","name":"https://git.kernel.org/stable/c/41aafca57de4a4c026701622bd4648f112a9edcd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31518","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31518","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 aca3ad0c262f54a5b5c95dda80a48365997d1224 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 41aafca57de4a4c026701622bd4648f112a9edcd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 4820847e036ff1035b01b69ad68dfc17e7028fe9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 6a3ec6efbc4f90e0ccb2e71574f07351f19996f4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/esp4.c","net/ipv6/esp6.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"aca3ad0c262f54a5b5c95dda80a48365997d1224","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"41aafca57de4a4c026701622bd4648f112a9edcd","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"4820847e036ff1035b01b69ad68dfc17e7028fe9","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"6a3ec6efbc4f90e0ccb2e71574f07351f19996f4","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"df6f995358dc1f3c42484f5cfe241d7bd3e1cd15","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"88d386243ed374ac969dabd3bbc1409a31d81818","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"6aa9841d917532d0f2d932d1ff2f3a94305aaf47","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"},{"lessThan":"0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2","status":"affected","version":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/esp4.c","net/ipv6/esp6.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.6"},{"lessThan":"5.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.131","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.131","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.80","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.21","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.11","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"5.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nesp: fix skb leak with espintcp and async crypto\n\nWhen the TX queue for espintcp is full, esp_output_tail_tcp will\nreturn an error and not free the skb, because with synchronous crypto,\nthe common xfrm output code will drop the packet for us.\n\nWith async crypto (esp_output_done), we need to drop the skb when\nesp_output_tail_tcp returns an error."}],"providerMetadata":{"dateUpdated":"2026-04-22T13:54:34.191Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/aca3ad0c262f54a5b5c95dda80a48365997d1224"},{"url":"https://git.kernel.org/stable/c/41aafca57de4a4c026701622bd4648f112a9edcd"},{"url":"https://git.kernel.org/stable/c/4820847e036ff1035b01b69ad68dfc17e7028fe9"},{"url":"https://git.kernel.org/stable/c/6a3ec6efbc4f90e0ccb2e71574f07351f19996f4"},{"url":"https://git.kernel.org/stable/c/df6f995358dc1f3c42484f5cfe241d7bd3e1cd15"},{"url":"https://git.kernel.org/stable/c/88d386243ed374ac969dabd3bbc1409a31d81818"},{"url":"https://git.kernel.org/stable/c/6aa9841d917532d0f2d932d1ff2f3a94305aaf47"},{"url":"https://git.kernel.org/stable/c/0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2"}],"title":"esp: fix skb leak with espintcp and async crypto","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31518","datePublished":"2026-04-22T13:54:34.191Z","dateReserved":"2026-03-09T15:48:24.108Z","dateUpdated":"2026-04-22T13:54:34.191Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-22 14:16:51","lastModifiedDate":"2026-04-22 14:16:51","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31518","Ordinal":"1","Title":"esp: fix skb leak with espintcp and async crypto","CVE":"CVE-2026-31518","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31518","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nesp: fix skb leak with espintcp and async crypto\n\nWhen the TX queue for espintcp is full, esp_output_tail_tcp will\nreturn an error and not free the skb, because with synchronous crypto,\nthe common xfrm output code will drop the packet for us.\n\nWith async crypto (esp_output_done), we need to drop the skb when\nesp_output_tail_tcp returns an error.","Type":"Description","Title":"esp: fix skb leak with espintcp and async crypto"}]}}}