264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-63828",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-07-19T07:54:57.014Z",
|
|
"datePublished": "2026-07-19T12:02:22.644Z",
|
|
"dateUpdated": "2026-08-17T04:51:36.839Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-17T04:51:36.839Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: mediate the implicit connect of TCP fast open sendmsg\n\nsendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and\nwrite(2): it opens the connection in the SYN. apparmor_socket_sendmsg()\nonly checks AA_MAY_SEND, so a profile that grants send but denies connect\nlets a confined task open an outbound TCP/MPTCP connection that connect(2)\nwould have refused, bypassing connect mediation.\n\nMediate the implicit connect when MSG_FASTOPEN is set and a destination\nis supplied. Add it to apparmor_socket_sendmsg() (not the shared\naa_sock_msg_perm() helper, which recvmsg also uses) and call aa_sk_perm()\ndirectly, mirroring the selinux and tomoyo fixes. sk_is_tcp() does not\ncover MPTCP fast open, so the SOCK_STREAM/IPPROTO_MPTCP arm is explicit."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
|
|
"baseScore": 8.4,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - Exploitation requires a confined local process to invoke sendmsg(2)/sendto(2) with MSG_FASTOPEN; the vulnerable AppArmor LSM hook runs on the syscall path before TCP fast-open performs its implicit connect.\nAC:L - Any confined task that already has send permission can reliably trigger the bypass with a single sendmsg/sendto call using MSG_FASTOPEN and a destination address, with no race or special victim state required beyond TCP Fast Open client support.\nPR:L - The attacker must be an unprivileged process confined by an AppArmor profile that grants network send but denies connect (e.g., hardened Snap/sandboxed service profiles on Ubuntu); no real root or capabilities beyond normal confined-user execution are needed.\nUI:N - No victim interaction is required; the confined attacker process directly issues the bypassing syscall without needing another user or administrator to perform any action.\nS:C - Successful exploitation crosses the AppArmor confinement boundary, allowing a sandboxed task to establish outbound TCP/MPTCP connections that connect(2) mediation would have blocked, escaping the intended network policy scope.\nC:H - Bypassing connect mediation lets a confined process open TCP/MPTCP sessions to destinations policy forbids and read arbitrary response data from those services (internal APIs, metadata endpoints, C2 servers), constituting unauthorized information disclosure.\nI:H - The bypass enables unauthorized outbound connection establishment and transmission of arbitrary application data (including SYN-cookie data) to hosts explicitly denied by the AppArmor connect rule, violating integrity of the confinement policy.\nA:N - This is a pure LSM policy-bypass flaw with no kernel memory corruption, panic, oops, hang, or resource exhaustion; exploitation does not impact system availability."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"security/apparmor/lsm.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "a16714e7cf2baa98ba2efddd5d6cbac641f4e76b",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "20383429b56974507c465d016e5238b189f7a246",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "7f57428ce00891d26b0f087ef754a4d820ec83aa",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "faea60deaa05c76f0772650f42eafde12bd39d93",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "07b71c342382b854ab8030b244aeab6a7228ad7d",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "4a69b83045d3195d5b9a9b053ad840ddb2998b4e",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "45ebb934ea50b436ce49b2f159f090dab0d7fa28",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "cf60af03ca4e71134206809ea892e49b92a88896",
|
|
"lessThan": "4d587cd8a72155089a627130bbd4716ec0856e21",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"security/apparmor/lsm.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "3.6",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "3.6",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.10.261",
|
|
"lessThanOrEqual": "5.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.15.212",
|
|
"lessThanOrEqual": "5.15.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.177",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.144",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.95",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.38",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.1.3",
|
|
"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": "3.6",
|
|
"versionEndExcluding": "5.10.261"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "3.6",
|
|
"versionEndExcluding": "5.15.212"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "3.6",
|
|
"versionEndExcluding": "6.1.177"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "3.6",
|
|
"versionEndExcluding": "6.6.144"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "3.6",
|
|
"versionEndExcluding": "6.12.95"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "3.6",
|
|
"versionEndExcluding": "6.18.38"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "3.6",
|
|
"versionEndExcluding": "7.1.3"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "3.6",
|
|
"versionEndExcluding": "7.2"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/a16714e7cf2baa98ba2efddd5d6cbac641f4e76b"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/20383429b56974507c465d016e5238b189f7a246"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/7f57428ce00891d26b0f087ef754a4d820ec83aa"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/faea60deaa05c76f0772650f42eafde12bd39d93"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/07b71c342382b854ab8030b244aeab6a7228ad7d"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/4a69b83045d3195d5b9a9b053ad840ddb2998b4e"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/45ebb934ea50b436ce49b2f159f090dab0d7fa28"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/4d587cd8a72155089a627130bbd4716ec0856e21"
|
|
}
|
|
],
|
|
"title": "apparmor: mediate the implicit connect of TCP fast open sendmsg",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
}
|
|
}
|
|
} |