235 lines
12 KiB
JSON
235 lines
12 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-74736",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-08-15T05:44:03.930Z",
|
|
"datePublished": "2026-08-26T14:36:49.950Z",
|
|
"dateUpdated": "2026-10-16T19:16:12.701Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-27T05:00:58.564Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_bpf: reject dev-bound programs bound to a different device\n\ncls_bpf_prog_from_efd() obtained a SCHED_CLS program via\nbpf_prog_get_type_dev() but never verified that a device-bound (offloaded)\nprogram's bound netdev matches the TC netdev the classifier is being\nattached to. This let a program loaded with prog_ifindex for device A be\nattached via cls_bpf + skip_sw to device B; deleting device A then\ndestroyed the program's offload state while it was still attached to\ndevice B, triggering a netdevsim WARN (panic with panic_on_warn=1).\n\nMirror the XDP attach path (net/core/dev.c) and reject the attach with\n-EINVAL when a dev-bound program's bound device does not match the\ntarget device."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 7.8,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - Exploitation requires local RTM_NEWTFILTER and bpf(2) syscalls to misattach a dev-bound cls_bpf program and delete the bound netdev; received network packets are not the trigger and no remote pre-auth path reaches this code.\nAC:L - The attacker fully controls bpf load on device A, cls_bpf attach with SKIP_SW to device B, and deletion of device A, deterministically reproducing the offload teardown while the program remains referenced on device B.\nPR:L - RTNL TC filter operations require CAP_NET_ADMIN and BPF_PROG_TYPE_SCHED_CLS loading requires CAP_NET_ADMIN (and often CAP_BPF), all grantable to the namespace root created by an unprivileged user via unshare -Urn per kernel CNA guidance.\nUI:N - No victim interaction is required; the attacker performs bpf program load, cls_bpf attach, and netdev deletion through their own namespace-local administrative operations.\nS:U - Impact is kernel memory corruption, panic, or privilege escalation within the same host kernel and does not cross VM, container, or IOMMU boundaries into a separate security authority.\nC:H - Deleting the bound netdev destroys bpf offload private state while cls_bpf on another device still holds the program reference, freeing dev_private metadata and creating a use-after-free that can leak kernel heap contents on subsequent TC/BPF operations.\nI:H - The lifetime mismatch frees attacker-influenceable offload objects while references remain, enabling heap grooming and memory corruption that can be leveraged into arbitrary kernel writes or code execution.\nA:H - netdevsim WARNs when offload state is destroyed while the program remains loaded on another port, causing kernel panic on systems with panic_on_warn enabled, and dereferencing freed offload state can also trigger kernel oops or hang."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"net/sched/cls_bpf.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1",
|
|
"lessThan": "ec5a552f4b2d841c6c021752450716e1a9676661",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1",
|
|
"lessThan": "daf546ab5763ce6a18280cb4db060e836c515301",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1",
|
|
"lessThan": "adb3e7c26a51a10d94a241c6de7a81a2863dcacf",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1",
|
|
"lessThan": "5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1",
|
|
"lessThan": "120977e2c096deea4e866e4273be9220b957c29e",
|
|
"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/sched/cls_bpf.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.3",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.3",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.153",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.105",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.46",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.1.10",
|
|
"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": "6.3",
|
|
"versionEndExcluding": "6.6.153"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.3",
|
|
"versionEndExcluding": "6.12.105"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.3",
|
|
"versionEndExcluding": "6.18.46"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.3",
|
|
"versionEndExcluding": "7.1.10"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.3",
|
|
"versionEndExcluding": "7.2"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/ec5a552f4b2d841c6c021752450716e1a9676661"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/daf546ab5763ce6a18280cb4db060e836c515301"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/adb3e7c26a51a10d94a241c6de7a81a2863dcacf"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/120977e2c096deea4e866e4273be9220b957c29e"
|
|
}
|
|
],
|
|
"title": "net/sched: cls_bpf: reject dev-bound programs bound to a different device",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2026-74736",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-16T19:15:56.417878Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-16T19:16:12.701Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |