{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68315","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-30T09:28:09.382Z","datePublished":"2026-08-10T12:02:50.156Z","dateUpdated":"2026-08-19T16:33:08.206Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-19T16:33:08.206Z"},"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."}],"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)."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/stream.c"],"versions":[{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"61327d8e7cfb0259d527be17202630f556213249","status":"affected","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"7cf7439948e3bf639119119922c88ec190874ca3","status":"affected","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"60c47dea5d320d2fc706e9aad1db38a04df0a056","status":"affected","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b","status":"affected","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"6f0e39d180cd7cced647381b6fa14fd83d261047","status":"affected","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"1a10fe1aa9c01f41b389a31906a77d538637c9d9","status":"affected","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"00ae679cb21a035491fdad8d58dc6d79cc68b675","status":"affected","versionType":"git"},{"version":"7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137","lessThan":"18ae07691d43183d270de8be9dc8e027906015d9","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/stream.c"],"versions":[{"version":"4.11","status":"affected"},{"version":"0","lessThan":"4.11","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.148","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"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"}]}]}],"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"}}}}