{"api_version":"1","generated_at":"2026-08-22T17:47:27+00:00","cve":"CVE-2026-68315","urls":{"html":"https://cve.report/CVE-2026-68315","api":"https://cve.report/api/cve/CVE-2026-68315.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68315","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68315"},"summary":{"title":"sctp: validate stream count in sctp_process_strreset_inreq()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate stream count in sctp_process_strreset_inreq()\n\nWhen processing a RESET_IN_REQUEST from a peer,\nsctp_process_strreset_inreq() derives the stream count from the\nparameter length but does not check whether the resulting\nRESET_OUT_REQUEST would exceed SCTP_MAX_CHUNK_LEN.\n\nThe OUT request header (sctp_strreset_outreq, 16 bytes) is 8 bytes\nlarger than the IN request header (sctp_strreset_inreq, 8 bytes).\nGenerally, the IP payload is bounded to 65535 bytes, so the stream\nlist cannot be large enough to trigger the overflow. However, on\ninterfaces with MTU > 65535 (e.g., loopback with IPv6 jumbograms), a\nstream list that fits within the incoming IN parameter can cause a\n__u16 overflow in sctp_make_strreset_req() when computing the OUT\nrequest size, leading to an undersized skb allocation and a kernel\nBUG:\n\n  net/core/skbuff.c:207         skb_panic\n  net/core/skbuff.c:2625        skb_put\n  net/sctp/sm_make_chunk.c:1535 sctp_addto_chunk\n  net/sctp/sm_make_chunk.c:3695 sctp_make_strreset_req\n  net/sctp/stream.c:655         sctp_process_strreset_inreq\n\nThe local setsockopt path validates the generated reset request size.\nHowever, for an incoming-only reset, it accounts for the smaller IN\nrequest even though the peer must generate an OUT request with the same\nstream list. Such a request cannot be completed successfully by the\npeer.\n\nReject peer IN requests whose corresponding OUT request would exceed\nSCTP_MAX_CHUNK_LEN. Also tighten the local check so it does not send an\nIN request that would require an oversized OUT request from the peer.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:21","updated_at":"2026-08-19 17:20:42"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/60c47dea5d320d2fc706e9aad1db38a04df0a056","name":"https://git.kernel.org/stable/c/60c47dea5d320d2fc706e9aad1db38a04df0a056","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6f0e39d180cd7cced647381b6fa14fd83d261047","name":"https://git.kernel.org/stable/c/6f0e39d180cd7cced647381b6fa14fd83d261047","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/18ae07691d43183d270de8be9dc8e027906015d9","name":"https://git.kernel.org/stable/c/18ae07691d43183d270de8be9dc8e027906015d9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b","name":"https://git.kernel.org/stable/c/b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7cf7439948e3bf639119119922c88ec190874ca3","name":"https://git.kernel.org/stable/c/7cf7439948e3bf639119119922c88ec190874ca3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/61327d8e7cfb0259d527be17202630f556213249","name":"https://git.kernel.org/stable/c/61327d8e7cfb0259d527be17202630f556213249","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/00ae679cb21a035491fdad8d58dc6d79cc68b675","name":"https://git.kernel.org/stable/c/00ae679cb21a035491fdad8d58dc6d79cc68b675","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1a10fe1aa9c01f41b389a31906a77d538637c9d9","name":"https://git.kernel.org/stable/c/1a10fe1aa9c01f41b389a31906a77d538637c9d9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68315","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68315","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 61327d8e7cfb0259d527be17202630f556213249 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 7cf7439948e3bf639119119922c88ec190874ca3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 60c47dea5d320d2fc706e9aad1db38a04df0a056 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"68315","cve":"CVE-2026-68315","epss":"0.004460000","percentile":"0.372950000","score_date":"2026-08-19","updated_at":"2026-08-20 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the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate stream count in sctp_process_strreset_inreq()\n\nWhen processing a RESET_IN_REQUEST from a peer,\nsctp_process_strreset_inreq() derives the stream count from the\nparameter length but does not check whether the resulting\nRESET_OUT_REQUEST would exceed SCTP_MAX_CHUNK_LEN.\n\nThe OUT request header (sctp_strreset_outreq, 16 bytes) is 8 bytes\nlarger than the IN request header (sctp_strreset_inreq, 8 bytes).\nGenerally, the IP payload is bounded to 65535 bytes, so the stream\nlist cannot be large enough to trigger the overflow. However, on\ninterfaces with MTU > 65535 (e.g., loopback with IPv6 jumbograms), a\nstream list that fits within the incoming IN parameter can cause a\n__u16 overflow in sctp_make_strreset_req() when computing the OUT\nrequest size, leading to an undersized skb allocation and a kernel\nBUG:\n\n  net/core/skbuff.c:207         skb_panic\n  net/core/skbuff.c:2625        skb_put\n  net/sctp/sm_make_chunk.c:1535 sctp_addto_chunk\n  net/sctp/sm_make_chunk.c:3695 sctp_make_strreset_req\n  net/sctp/stream.c:655         sctp_process_strreset_inreq\n\nThe local setsockopt path validates the generated reset request size.\nHowever, for an incoming-only reset, it accounts for the smaller IN\nrequest even though the peer must generate an OUT request with the same\nstream list. Such a request cannot be completed successfully by the\npeer.\n\nReject peer IN requests whose corresponding OUT request would exceed\nSCTP_MAX_CHUNK_LEN. Also tighten the local check so it does not send an\nIN request that would require an oversized OUT request from the peer."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerability is triggered by processing an SCTP RECONF chunk (RESET_IN_REQUEST) received from a remote/loopback peer in the in-kernel SCTP stack; per kernel guidance net-stack bugs reachable via received packets are Network.\nAC:L - The attacker fully controls the stream list length in the IN request, and the required MTU>65535 is the default for loopback (65536), so the panic is reliably triggerable; stream-reset must be enabled but that is a deployment condition, not an attacker-uncontrollable one.\nPR:N - Sending the RECONF chunk only requires an established SCTP association, which any peer can set up without authentication or credentials; the bug is reached during normal association-scoped packet processing.\nUI:N - No victim interaction is needed; the attacker simply sends a crafted RECONF chunk to an established association.\nS:U - The crash occurs within the kernel's own security scope with no crossing of a security boundary such as VM or IOMMU.\nC:N - The bug is a controlled BUG()/skb_over_panic that aborts before any out-of-bounds access, disclosing no memory contents.\nI:N - The panic fires before the oversized copy executes, so no memory is written or modified out of bounds.\nA:H - The undersized skb allocation causes skb_put to invoke skb_over_panic → BUG(), producing a kernel panic (denial of service)."}]}],"providerMetadata":{"dateUpdated":"2026-08-19T16:33:08.206Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/61327d8e7cfb0259d527be17202630f556213249"},{"url":"https://git.kernel.org/stable/c/7cf7439948e3bf639119119922c88ec190874ca3"},{"url":"https://git.kernel.org/stable/c/60c47dea5d320d2fc706e9aad1db38a04df0a056"},{"url":"https://git.kernel.org/stable/c/b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b"},{"url":"https://git.kernel.org/stable/c/6f0e39d180cd7cced647381b6fa14fd83d261047"},{"url":"https://git.kernel.org/stable/c/1a10fe1aa9c01f41b389a31906a77d538637c9d9"},{"url":"https://git.kernel.org/stable/c/00ae679cb21a035491fdad8d58dc6d79cc68b675"},{"url":"https://git.kernel.org/stable/c/18ae07691d43183d270de8be9dc8e027906015d9"}],"title":"sctp: validate stream count in sctp_process_strreset_inreq()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68315","datePublished":"2026-08-10T12:02:50.156Z","dateReserved":"2026-07-30T09:28:09.382Z","dateUpdated":"2026-08-19T16:33:08.206Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:21","lastModifiedDate":"2026-08-19 17:20:42","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68315","Ordinal":"1","Title":"sctp: validate stream count in sctp_process_strreset_inreq()","CVE":"CVE-2026-68315","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68315","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate stream count in sctp_process_strreset_inreq()\n\nWhen processing a RESET_IN_REQUEST from a peer,\nsctp_process_strreset_inreq() derives the stream count from the\nparameter length but does not check whether the resulting\nRESET_OUT_REQUEST would exceed SCTP_MAX_CHUNK_LEN.\n\nThe OUT request header (sctp_strreset_outreq, 16 bytes) is 8 bytes\nlarger than the IN request header (sctp_strreset_inreq, 8 bytes).\nGenerally, the IP payload is bounded to 65535 bytes, so the stream\nlist cannot be large enough to trigger the overflow. However, on\ninterfaces with MTU > 65535 (e.g., loopback with IPv6 jumbograms), a\nstream list that fits within the incoming IN parameter can cause a\n__u16 overflow in sctp_make_strreset_req() when computing the OUT\nrequest size, leading to an undersized skb allocation and a kernel\nBUG:\n\n  net/core/skbuff.c:207         skb_panic\n  net/core/skbuff.c:2625        skb_put\n  net/sctp/sm_make_chunk.c:1535 sctp_addto_chunk\n  net/sctp/sm_make_chunk.c:3695 sctp_make_strreset_req\n  net/sctp/stream.c:655         sctp_process_strreset_inreq\n\nThe local setsockopt path validates the generated reset request size.\nHowever, for an incoming-only reset, it accounts for the smaller IN\nrequest even though the peer must generate an OUT request with the same\nstream list. Such a request cannot be completed successfully by the\npeer.\n\nReject peer IN requests whose corresponding OUT request would exceed\nSCTP_MAX_CHUNK_LEN. Also tighten the local check so it does not send an\nIN request that would require an oversized OUT request from the peer.","Type":"Description","Title":"sctp: validate stream count in sctp_process_strreset_inreq()"}]}}}