{"api_version":"1","generated_at":"2026-06-27T02:40:26+00:00","cve":"CVE-2025-40248","urls":{"html":"https://cve.report/CVE-2025-40248","api":"https://cve.report/api/cve/CVE-2025-40248.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-40248","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-40248"},"summary":{"title":"vsock: Ignore signal/timeout on connect() if already established","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: Ignore signal/timeout on connect() if already established\n\nDuring connect(), acting on a signal/timeout by disconnecting an already\nestablished socket leads to several issues:\n\n1. connect() invoking vsock_transport_cancel_pkt() ->\n   virtio_transport_purge_skbs() may race with sendmsg() invoking\n   virtio_transport_get_credit(). This results in a permanently elevated\n   `vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling.\n\n2. connect() resetting a connected socket's state may race with socket\n   being placed in a sockmap. A disconnected socket remaining in a sockmap\n   breaks sockmap's assumptions. And gives rise to WARNs.\n\n3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a\n   transport change/drop after TCP_ESTABLISHED. Which poses a problem for\n   any simultaneous sendmsg() or connect() and may result in a\n   use-after-free/null-ptr-deref.\n\nDo not disconnect socket on signal/timeout. Keep the logic for unconnected\nsockets: they don't linger, can't be placed in a sockmap, are rejected by\nsendmsg().\n\n[1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/\n[2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/\n[3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-04 16:16:18","updated_at":"2026-06-02 14:16:30"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559","name":"https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af","name":"https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4","name":"https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5","name":"https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-253495.html","name":"https://cert-portal.siemens.com/productcert/html/ssa-253495.html","refsource":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81","name":"https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc","name":"https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a","name":"https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680","name":"https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40248","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40248","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 3f71753935d648082a8279a97d30efe6b85be680 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 da664101fb4a0de5cb70d2bae6a650df954df2af git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 67432915145848658149683101104e32f9fd6559 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 eeca93f06df89be5a36305b7b9dae1ed65550dfc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 5998da5a8208ae9ad7838ba322bccb2bdcd95e81 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 f1c170cae285e4b8f61be043bb17addc3d0a14b5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 ab6b19f690d89ae4709fba73a3c4a7911f495b7a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d021c344051af91f42c5ba9fdedc176740cbd238 002541ef650b742a198e4be363881439bb9d86b4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4.302 5.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.247 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.197 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.159 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.118 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.60 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17.10 6.17.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 * original_commit_for_fix","platforms":[]},{"source":"ADP","vendor":"Siemens","product":"RUGGEDCOM RST2428P","version":"affected V4.0 custom","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2025","cve_id":"40248","cve":"CVE-2025-40248","epss":"0.000880000","percentile":"0.250730000","score_date":"2026-06-08","updated_at":"2026-06-09 00:12:52"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"affected":[{"defaultStatus":"unknown","product":"RUGGEDCOM RST2428P","vendor":"Siemens","versions":[{"lessThan":"V4.0","status":"affected","version":"0","versionType":"custom"}]}],"providerMetadata":{"dateUpdated":"2026-06-02T12:59:57.735Z","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP"},"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-253495.html"}],"x_adpType":"supplier"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/vmw_vsock/af_vsock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3f71753935d648082a8279a97d30efe6b85be680","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"da664101fb4a0de5cb70d2bae6a650df954df2af","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"67432915145848658149683101104e32f9fd6559","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"eeca93f06df89be5a36305b7b9dae1ed65550dfc","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"5998da5a8208ae9ad7838ba322bccb2bdcd95e81","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"f1c170cae285e4b8f61be043bb17addc3d0a14b5","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"ab6b19f690d89ae4709fba73a3c4a7911f495b7a","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"},{"lessThan":"002541ef650b742a198e4be363881439bb9d86b4","status":"affected","version":"d021c344051af91f42c5ba9fdedc176740cbd238","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/vmw_vsock/af_vsock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.9"},{"lessThan":"3.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.302","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.247","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.197","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.159","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.118","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.60","versionType":"semver"},{"lessThanOrEqual":"6.17.*","status":"unaffected","version":"6.17.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.18","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.302","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.247","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.197","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.159","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.118","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.60","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.17.10","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18","versionStartIncluding":"3.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: Ignore signal/timeout on connect() if already established\n\nDuring connect(), acting on a signal/timeout by disconnecting an already\nestablished socket leads to several issues:\n\n1. connect() invoking vsock_transport_cancel_pkt() ->\n   virtio_transport_purge_skbs() may race with sendmsg() invoking\n   virtio_transport_get_credit(). This results in a permanently elevated\n   `vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling.\n\n2. connect() resetting a connected socket's state may race with socket\n   being placed in a sockmap. A disconnected socket remaining in a sockmap\n   breaks sockmap's assumptions. And gives rise to WARNs.\n\n3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a\n   transport change/drop after TCP_ESTABLISHED. Which poses a problem for\n   any simultaneous sendmsg() or connect() and may result in a\n   use-after-free/null-ptr-deref.\n\nDo not disconnect socket on signal/timeout. Keep the logic for unconnected\nsockets: they don't linger, can't be placed in a sockmap, are rejected by\nsendmsg().\n\n[1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/\n[2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/\n[3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/"}],"providerMetadata":{"dateUpdated":"2026-05-11T21:45:39.557Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680"},{"url":"https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af"},{"url":"https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559"},{"url":"https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc"},{"url":"https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81"},{"url":"https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5"},{"url":"https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a"},{"url":"https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4"}],"title":"vsock: Ignore signal/timeout on connect() if already established","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-40248","datePublished":"2025-12-04T16:08:11.509Z","dateReserved":"2025-04-16T07:20:57.181Z","dateUpdated":"2026-06-02T12:59:57.735Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-04 16:16:18","lastModifiedDate":"2026-06-02 14:16:30","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"40248","Ordinal":"1","Title":"vsock: Ignore signal/timeout on connect() if already established","CVE":"CVE-2025-40248","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"40248","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: Ignore signal/timeout on connect() if already established\n\nDuring connect(), acting on a signal/timeout by disconnecting an already\nestablished socket leads to several issues:\n\n1. connect() invoking vsock_transport_cancel_pkt() ->\n   virtio_transport_purge_skbs() may race with sendmsg() invoking\n   virtio_transport_get_credit(). This results in a permanently elevated\n   `vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling.\n\n2. connect() resetting a connected socket's state may race with socket\n   being placed in a sockmap. A disconnected socket remaining in a sockmap\n   breaks sockmap's assumptions. And gives rise to WARNs.\n\n3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a\n   transport change/drop after TCP_ESTABLISHED. Which poses a problem for\n   any simultaneous sendmsg() or connect() and may result in a\n   use-after-free/null-ptr-deref.\n\nDo not disconnect socket on signal/timeout. Keep the logic for unconnected\nsockets: they don't linger, can't be placed in a sockmap, are rejected by\nsendmsg().\n\n[1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/\n[2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/\n[3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/","Type":"Description","Title":"vsock: Ignore signal/timeout on connect() if already established"}]}}}