{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68118", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.369Z", "datePublished": "2026-08-10T11:58:38.000Z", "dateUpdated": "2026-08-10T11:58:38.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-10T11:58:38.000Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: challenge ACK for non-exact RST in SYN-RECEIVED\n\nThe SYN-RECEIVED request-socket path in tcp_check_req() accepts an\nin-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A\nnon-exact RST therefore removes the request instead of eliciting a\nchallenge ACK.\n\nRFC 9293 section 3.10.7.4 applies the RFC 5961 reset check in\nSYN-RECEIVED: an exact RST resets the connection, while a non-exact\nin-window RST must trigger a challenge ACK and be dropped.\n\nApply that check before the ACK-field validation, following the RFC\nsequence-number, RST, then ACK processing order. Factor the per-netns\nchallenge ACK quota out of tcp_send_challenge_ack() so request sockets\ncan share it. Use the request socket's send_ack() callback and its own\nout-of-window ACK timestamp to send and rate-limit the response."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/tcp.h", "net/ipv4/tcp_input.c", "net/ipv4/tcp_minisocks.c"], "versions": [{"version": "282f23c6ee343126156dd41218b22ece96d747e3", "lessThan": "234f9ffbd9b2c1b24ec67200ea3cff07401bec48", "status": "affected", "versionType": "git"}, {"version": "282f23c6ee343126156dd41218b22ece96d747e3", "lessThan": "22cec809b048495310f206d9abbcdbbfbdce3ae3", "status": "affected", "versionType": "git"}, {"version": "282f23c6ee343126156dd41218b22ece96d747e3", "lessThan": "a28c4fcbf774e23b4779cae468e3497a5ad1f4a1", "status": "affected", "versionType": "git"}, {"version": "86791bbfe5ed7b275be040cfeff049a1624af1b7", "status": "affected", "versionType": "git"}, {"version": "61f69dc4e40e41b0018f00fa4aeb23d3239556fb", "status": "affected", "versionType": "git"}, {"version": "34fb350281ced2a72707a5c0064f69992d440edb", "status": "affected", "versionType": "git"}, {"version": "3.0.58", "lessThan": "3.1", "status": "affected", "versionType": "semver"}, {"version": "3.2.37", "lessThan": "3.3", "status": "affected", "versionType": "semver"}, {"version": "3.4.25", "lessThan": "3.5", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/tcp.h", "net/ipv4/tcp_input.c", "net/ipv4/tcp_minisocks.c"], "versions": [{"version": "3.6", "status": "affected"}, {"version": "0", "lessThan": "3.6", "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": "3.6", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "7.2-rc5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.0.58"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2.37"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4.25"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/234f9ffbd9b2c1b24ec67200ea3cff07401bec48"}, {"url": "https://git.kernel.org/stable/c/22cec809b048495310f206d9abbcdbbfbdce3ae3"}, {"url": "https://git.kernel.org/stable/c/a28c4fcbf774e23b4779cae468e3497a5ad1f4a1"}], "title": "tcp: challenge ACK for non-exact RST in SYN-RECEIVED", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[282f23c6ee343126156dd41218b22ece96d747e3,234f9ffbd9b2c1b24ec67200ea3cff07401bec48)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[282f23c6ee343126156dd41218b22ece96d747e3,22cec809b048495310f206d9abbcdbbfbdce3ae3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[282f23c6ee343126156dd41218b22ece96d747e3,a28c4fcbf774e23b4779cae468e3497a5ad1f4a1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "86791bbfe5ed7b275be040cfeff049a1624af1b7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "61f69dc4e40e41b0018f00fa4aeb23d3239556fb"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "34fb350281ced2a72707a5c0064f69992d440edb"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.58,3.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.37,3.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.25,3.5)"}}], "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": "generic", "value": "3.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.42,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.6,7.1.*]"}}, {"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": "2026-08-10T15:00:03.566016+00:00", "updated": "2026-08-10T19:30:17.210012+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-346"]}