CVE-2026-90313
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed A potential invalid storage access issue can occur after replacing a cgroup bpf prog. This occurs in the following scenario: 1. prog1 with storage is attached to a cgroup in multi-attach mode. 2. prog1 is replaced with prog2 using BPF_F_REPLACE in multi-attach mode, but fails midway (e.g. in bpf_trampoline_link_cgroup_shim or update_effective_progs). 3. A new prog3 is attached to the cgroup in multi-attach mode. The reason is that __cgroup_bpf_attach overwrites pl->storage with the new storage prior to attachment completion. When attachment fails midway, the cleanup path calls bpf_cgroup_storages_free(new_storage) to free the newly allocated storage, but fails to restore pl->storage back to old_storage. Consequently, the still-active prog1 holds invalid or dangling storage pointers, leading to an invalid memory access when prog1 executes and calls bpf_get_local_storage. Additionally, original pl->flags and cgrp->bpf.flags[atype] are left unrestored. Fix this by saving old_pl_flags, old_storage, and old_flags prior to the update, and properly restoring all of them in the cleanup path on error.
View original CVE JSON
{
"id": "CVE-2026-90313",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-17T17:17:29.087",
"lastModified": "2026-10-30T13:20:49.570",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed\n\nA potential invalid storage access issue can occur after replacing a\ncgroup bpf prog.\n\nThis occurs in the following scenario:\n1. prog1 with storage is attached to a cgroup in multi-attach mode.\n2. prog1 is replaced with prog2 using BPF_F_REPLACE in multi-attach\n mode, but fails midway (e.g. in bpf_trampoline_link_cgroup_shim or\n update_effective_progs).\n3. A new prog3 is attached to the cgroup in multi-attach mode.\n\nThe reason is that __cgroup_bpf_attach overwrites pl->storage with the\nnew storage prior to attachment completion. When attachment fails\nmidway, the cleanup path calls bpf_cgroup_storages_free(new_storage) to\nfree the newly allocated storage, but fails to restore pl->storage back\nto old_storage.\n\nConsequently, the still-active prog1 holds invalid or dangling storage\npointers, leading to an invalid memory access when prog1 executes and\ncalls bpf_get_local_storage. Additionally, original pl->flags and\ncgrp->bpf.flags[atype] are left unrestored.\n\nFix this by saving old_pl_flags, old_storage, and old_flags prior to the\nupdate, and properly restoring all of them in the cleanup path on error."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"kernel/bpf/cgroup.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
"lessThan": "217b257d2c39e8dc32d691e8952f3cd921a80233",
"versionType": "git",
"status": "affected"
},
{
"version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
"lessThan": "e26db0d636e4c24a6b16683ea95cf5077c64d74b",
"versionType": "git",
"status": "affected"
},
{
"version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
"lessThan": "aaca16e042527f7efe48b50799bc662f1a191ce1",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "86ead176301109b78e1d14c0e9d0d9ff9723c769",
"versionType": "git",
"status": "affected"
},
{
"version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
"lessThan": "2c2218560b6e28a63ff7834ba26d09ff8efdee39",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "6655c409707ec8ce9ce0850ffe4fe02331fd4d9c",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"kernel/bpf/cgroup.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.9",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.52",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.6",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/217b257d2c39e8dc32d691e8952f3cd921a80233",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2c2218560b6e28a63ff7834ba26d09ff8efdee39",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6655c409707ec8ce9ce0850ffe4fe02331fd4d9c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/86ead176301109b78e1d14c0e9d0d9ff9723c769",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/aaca16e042527f7efe48b50799bc662f1a191ce1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e26db0d636e4c24a6b16683ea95cf5077c64d74b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}