224 lines
12 KiB
JSON
224 lines
12 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-90099",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-09-11T19:38:34.786Z",
|
|
"datePublished": "2026-09-17T16:06:10.858Z",
|
|
"dateUpdated": "2026-10-30T12:34:07.767Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-10-30T12:34:07.767Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: account classifier filter allocations to memcg\n\nAllocations in the tc classifier *_change() paths (filter objects,\nper-CPU counters, and per-filter aux data) use plain GFP_KERNEL without\n__GFP_ACCOUNT, allowing unprivileged users to pin kernel memory outside\nmemcg charging. The shared tcf_exts_init_ex() action array allocation in\ncls_api.c was also uncharged; this patch closes it along with the\nper-classifier filter-object/percpu/aux allocations that remain\nunaccounted.\n\nAdd GFP_KERNEL_ACCOUNT to:\n- the shared tcf_exts_init_ex() action array (cls_api.c), common to every\n filter of every classifier (32 pointers, 256 bytes);\n- the filter-object, per-CPU-counter, and per-filter aux allocations in\n cls_basic, cls_bpf, cls_cgroup, cls_flow, cls_flower, cls_fw,\n cls_matchall, cls_route and cls_u32;\n- the u32_init_knode() replace-path knode allocation (cls_u32.c), which\n allocates the same struct tc_u_knode + sel.keys on every replace of an\n existing knode and was missed by the create-path-only conversion.\n\nAlso fix the cls_basic error path: basic_change() inserts fnew into the\nIDR before allocating the per-CPU counter. If alloc_percpu() fails the\nerrout path kfree'd fnew without idr_remove, leaving a dangling pointer\nin the IDR. With GFP_KERNEL_ACCOUNT the percpu alloc becomes failable\non demand (memcg at memory.max), making the dead path attacker-reachable\nand burning the handle permanently. Add the idr_remove on the percpu\nfailure path, matching the basic_set_parms failure-path pattern.\n\nNote: vega@nebusec.ai provided a poc for basic_cls, but it was easy to\nextend to the other classifiers.\n\nConditions to recreate the bug:\n- CONFIG_NET_SCHED, CONFIG_NET_CLS_* (the classifier being used),\n CONFIG_NET_CLS_ACT, CONFIG_MEMCG, CONFIG_USER_NS, CONFIG_NET_NS.\n- Unprivileged user in a fresh user+network namespace (unshare -Urn),\n or root with CAP_NET_ADMIN.\n- Create a large number of tc filters (e.g. tc filter add dev lo\n ingress ... <classifier> ...) while watching a memcg-limited cgroup:\n system slab grows far faster than memory.current, pinning kernel\n memory outside memcg charging."
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"net/sched/cls_api.c",
|
|
"net/sched/cls_basic.c",
|
|
"net/sched/cls_bpf.c",
|
|
"net/sched/cls_cgroup.c",
|
|
"net/sched/cls_flow.c",
|
|
"net/sched/cls_flower.c",
|
|
"net/sched/cls_fw.c",
|
|
"net/sched/cls_matchall.c",
|
|
"net/sched/cls_route.c",
|
|
"net/sched/cls_u32.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "0da974f4f303a6842516b764507e3c0a03f41e5a",
|
|
"lessThan": "8a622d5b4d81c1572f42bbf3fb823b6e63d44dae",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "0da974f4f303a6842516b764507e3c0a03f41e5a",
|
|
"lessThan": "5fbb06d4f3d4c509ffe95572384a498bf319e5bf",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "0da974f4f303a6842516b764507e3c0a03f41e5a",
|
|
"lessThan": "bf6006cea193cf065f7a64fc7974247f8112af33",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "0da974f4f303a6842516b764507e3c0a03f41e5a",
|
|
"lessThan": "68fb30607169c92de57c5c82b6af8a733af1cc09",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "0da974f4f303a6842516b764507e3c0a03f41e5a",
|
|
"lessThan": "18c68c8f3d3ff0a4def1391021b439c4333a6c71",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "0da974f4f303a6842516b764507e3c0a03f41e5a",
|
|
"lessThan": "1beb81947eb486716af80db7a584f9e9fef7e003",
|
|
"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_api.c",
|
|
"net/sched/cls_basic.c",
|
|
"net/sched/cls_bpf.c",
|
|
"net/sched/cls_cgroup.c",
|
|
"net/sched/cls_flow.c",
|
|
"net/sched/cls_flower.c",
|
|
"net/sched/cls_fw.c",
|
|
"net/sched/cls_matchall.c",
|
|
"net/sched/cls_route.c",
|
|
"net/sched/cls_u32.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "2.6.18",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "2.6.18",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.191",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.160",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.114",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.57",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.2.6",
|
|
"lessThanOrEqual": "7.2.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.3",
|
|
"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": "2.6.18",
|
|
"versionEndExcluding": "6.1.191"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.18",
|
|
"versionEndExcluding": "6.6.160"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.18",
|
|
"versionEndExcluding": "6.12.114"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.18",
|
|
"versionEndExcluding": "6.18.57"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.18",
|
|
"versionEndExcluding": "7.2.6"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "2.6.18",
|
|
"versionEndExcluding": "7.3"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/8a622d5b4d81c1572f42bbf3fb823b6e63d44dae"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/5fbb06d4f3d4c509ffe95572384a498bf319e5bf"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/bf6006cea193cf065f7a64fc7974247f8112af33"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/68fb30607169c92de57c5c82b6af8a733af1cc09"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/18c68c8f3d3ff0a4def1391021b439c4333a6c71"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/1beb81947eb486716af80db7a584f9e9fef7e003"
|
|
}
|
|
],
|
|
"title": "net/sched: account classifier filter allocations to memcg",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
}
|
|
}
|
|
} |