{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68320", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.382Z", "datePublished": "2026-08-10T12:02:55.144Z", "dateUpdated": "2026-08-13T22:43:18.435Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-13T22:43:18.435Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid\n\nsctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the\ncapacity limit for ep->auth_chunk_list, allowing it to hold up to\n20 chunk entries (param_hdr.length up to 24). However, the copy\ndestination asoc->c.auth_chunks in struct sctp_cookie is only\nSCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16\nchunks are added, sctp_association_init() memcpy overflows the\ndestination by up to 4 bytes.\n\nFix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching\nthe destination capacity."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The overflow condition can only be created locally: an attacker must call setsockopt(SCTP_AUTH_SUPPORTED) and then setsockopt(SCTP_AUTH_CHUNK) more than 16 times on an SCTP socket they own. A remote peer can trigger the memcpy by connecting to such a socket, but cannot itself populate the oversized chunk list.\nAC:L - The sequence is fully deterministic and entirely under attacker control \u2014 enable AUTH, add 17-20 distinct chunk IDs, then create an association via connect() or accept(); no race, timing window, or memory-layout condition is involved.\nPR:L - Creating an IPPROTO_SCTP socket and issuing SCTP_AUTH_SUPPORTED/SCTP_AUTH_CHUNK setsockopts requires no capability; sctp_setsockopt_auth_supported() enables AUTH per-endpoint regardless of the net.sctp.auth_enable sysctl, so any unprivileged local user reaches the bug.\nUI:N - The attacker performs every step from their own process \u2014 socket setup, setsockopt calls, and association establishment \u2014 with no action required from any other user or administrator.\nS:U - The corruption and the over-read are confined to the kernel's own SCTP association object; no other security authority or privilege domain is crossed.\nC:L - sctp_make_init()/sctp_make_init_ack() copy ntohs(auth_chunks->length) bytes from the 20-byte field, emitting up to 4 bytes past it (the adjacent raw_addr_list_len) inside the CHUNKS parameter of INIT/INIT-ACK sent to the remote peer \u2014 a real but small, strictly bounded out-of-bounds read.\nI:H - sctp_association_init() writes up to 4 bytes of fully attacker-chosen data (the chunk-ID values) past the end of asoc->c.auth_chunks into the adjacent kernel struct field, an out-of-bounds write of controlled content into kernel memory.\nA:H - On CONFIG_FORTIFY_SOURCE kernels the memcpy is flagged as a field-spanning write and emits a WARN, which is fatal on the widely used panic_on_warn configurations, and the out-of-bounds write itself corrupts SCTP association state; the trigger is cheap and repeatable by any local user."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/auth.c"], "versions": [{"version": "1f485649f52929d9937b346a920a522a7363e202", "lessThan": "5a365f1e423444c5da7eb689a8661633dad43e48", "status": "affected", "versionType": "git"}, {"version": "1f485649f52929d9937b346a920a522a7363e202", "lessThan": "886e28e14ab655012779016d251fef53d103aa12", "status": "affected", "versionType": "git"}, {"version": "1f485649f52929d9937b346a920a522a7363e202", "lessThan": "11092d79eb2b7c0068382f72fc2416d1786bb2e0", "status": "affected", "versionType": "git"}, {"version": "1f485649f52929d9937b346a920a522a7363e202", "lessThan": "b6ea3dda09eb4d5caf7bbc00f857688cf9e98255", "status": "affected", "versionType": "git"}, {"version": "1f485649f52929d9937b346a920a522a7363e202", "lessThan": "ff04b26794a16a8a879eb4fd2c02c2d6b03850e9", "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/auth.c"], "versions": [{"version": "2.6.24", "status": "affected"}, {"version": "0", "lessThan": "2.6.24", "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-rc5", "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": "2.6.24", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "7.2-rc5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48"}, {"url": "https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12"}, {"url": "https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0"}, {"url": "https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255"}, {"url": "https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9"}], "title": "sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sctp/auth.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5a365f1e423444c5da7eb689a8661633dad43e48", "status": "affected", "version": "1f485649f52929d9937b346a920a522a7363e202", "versionType": "git"}, {"lessThan": "886e28e14ab655012779016d251fef53d103aa12", "status": "affected", "version": "1f485649f52929d9937b346a920a522a7363e202", "versionType": "git"}, {"lessThan": "11092d79eb2b7c0068382f72fc2416d1786bb2e0", "status": "affected", "version": "1f485649f52929d9937b346a920a522a7363e202", "versionType": "git"}, {"lessThan": "b6ea3dda09eb4d5caf7bbc00f857688cf9e98255", "status": "affected", "version": "1f485649f52929d9937b346a920a522a7363e202", "versionType": "git"}, {"lessThan": "ff04b26794a16a8a879eb4fd2c02c2d6b03850e9", "status": "affected", "version": "1f485649f52929d9937b346a920a522a7363e202", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sctp/auth.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.24"}, {"lessThan": "2.6.24", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc5", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid\n\nsctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the\ncapacity limit for ep->auth_chunk_list, allowing it to hold up to\n20 chunk entries (param_hdr.length up to 24). However, the copy\ndestination asoc->c.auth_chunks in struct sctp_cookie is only\nSCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16\nchunks are added, sctp_association_init() memcpy overflows the\ndestination by up to 4 bytes.\n\nFix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching\nthe destination capacity."}], "id": "CVE-2026-68320", "lastModified": "2026-08-13T23:17:30.000", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-10T13:20:22.050", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux Kernel: Memory corruption in SCTP due to buffer overflow", "id": "2513166", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513166"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid\nsctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the\ncapacity limit for ep->auth_chunk_list, allowing it to hold up to\n20 chunk entries (param_hdr.length up to 24). However, the copy\ndestination asoc->c.auth_chunks in struct sctp_cookie is only\nSCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16\nchunks are added, sctp_association_init() memcpy overflows the\ndestination by up to 4 bytes.\nFix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching\nthe destination capacity.", "A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. This vulnerability occurs because the `sctp_auth_ep_add_chunkid` function allows more data to be written than the allocated buffer can hold during the initialization of an SCTP association. A remote attacker could potentially exploit this buffer overflow to cause memory corruption, leading to a denial of service or other unpredictable system behavior."], "name": "CVE-2026-68320", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:02:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68320\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68320\nhttps://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0\nhttps://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48\nhttps://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12\nhttps://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255\nhttps://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1f485649f52929d9937b346a920a522a7363e202,5a365f1e423444c5da7eb689a8661633dad43e48)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1f485649f52929d9937b346a920a522a7363e202,886e28e14ab655012779016d251fef53d103aa12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1f485649f52929d9937b346a920a522a7363e202,11092d79eb2b7c0068382f72fc2416d1786bb2e0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1f485649f52929d9937b346a920a522a7363e202,b6ea3dda09eb4d5caf7bbc00f857688cf9e98255)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1f485649f52929d9937b346a920a522a7363e202,ff04b26794a16a8a879eb4fd2c02c2d6b03850e9)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.24"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,2.6.24)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T18:30:04.229998+00:00", "updated": "2026-08-14T01:00:05.205927+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}