{"id":"CVE-2026-68315","state":"PUBLISHED","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.","publishedAt":"2026-08-10T12:02:50.156Z","updatedAt":"2026-10-19T21:09:04.525Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"61327d8e7cfb0259d527be17202630f556213249","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"7cf7439948e3bf639119119922c88ec190874ca3","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"60c47dea5d320d2fc706e9aad1db38a04df0a056","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"6f0e39d180cd7cced647381b6fa14fd83d261047","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"1a10fe1aa9c01f41b389a31906a77d538637c9d9","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"00ae679cb21a035491fdad8d58dc6d79cc68b675","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"18ae07691d43183d270de8be9dc8e027906015d9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/stream.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.11","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/stream.c"]}],"references":["https://git.kernel.org/stable/c/61327d8e7cfb0259d527be17202630f556213249","https://git.kernel.org/stable/c/7cf7439948e3bf639119119922c88ec190874ca3","https://git.kernel.org/stable/c/60c47dea5d320d2fc706e9aad1db38a04df0a056","https://git.kernel.org/stable/c/b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b","https://git.kernel.org/stable/c/6f0e39d180cd7cced647381b6fa14fd83d261047","https://git.kernel.org/stable/c/1a10fe1aa9c01f41b389a31906a77d538637c9d9","https://git.kernel.org/stable/c/00ae679cb21a035491fdad8d58dc6d79cc68b675","https://git.kernel.org/stable/c/18ae07691d43183d270de8be9dc8e027906015d9"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68315.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68315","state":"PUBLISHED","datePublished":"2026-08-10T12:02:50.156Z","dateUpdated":"2026-10-19T21:09:04.525Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.382Z"},"containers":{"cna":{"title":"sctp: validate stream count in sctp_process_strreset_inreq()","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"61327d8e7cfb0259d527be17202630f556213249","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"7cf7439948e3bf639119119922c88ec190874ca3","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"60c47dea5d320d2fc706e9aad1db38a04df0a056","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"6f0e39d180cd7cced647381b6fa14fd83d261047","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"1a10fe1aa9c01f41b389a31906a77d538637c9d9","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"00ae679cb21a035491fdad8d58dc6d79cc68b675","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","status":"affected","lessThan":"18ae07691d43183d270de8be9dc8e027906015d9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/stream.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.11","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/stream.c"]}],"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"}],"metrics":[{"cvssV3_1":{"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"},"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":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:33:08.206Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-68315","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T15:47:00.535274Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","type":"CWE","description":"CWE-190 Integer Overflow or Wraparound"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T21:09:04.525Z"}}]}}}