CVE-2026-90313 (GCVE-0-2026-90313)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-19 09:01
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7d9c3427894fe70d1347b4820476bf37736d2ff0
Version: 7d9c3427894fe70d1347b4820476bf37736d2ff0
Version: 7d9c3427894fe70d1347b4820476bf37736d2ff0
Version: 7d9c3427894fe70d1347b4820476bf37736d2ff0
Version: 7d9c3427894fe70d1347b4820476bf37736d2ff0
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/cgroup.c"
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          "vendor": "Linux",
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              "version": "7.2.6",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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-\u003estorage 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-\u003estorage 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-\u003eflags and\ncgrp-\u003ebpf.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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:01:29.794Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e26db0d636e4c24a6b16683ea95cf5077c64d74b"
        },
        {
          "url": "https://git.kernel.org/stable/c/aaca16e042527f7efe48b50799bc662f1a191ce1"
        },
        {
          "url": "https://git.kernel.org/stable/c/86ead176301109b78e1d14c0e9d0d9ff9723c769"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c2218560b6e28a63ff7834ba26d09ff8efdee39"
        },
        {
          "url": "https://git.kernel.org/stable/c/6655c409707ec8ce9ce0850ffe4fe02331fd4d9c"
        }
      ],
      "title": "bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90313",
    "datePublished": "2026-09-17T16:08:32.932Z",
    "dateReserved": "2026-09-11T19:38:34.801Z",
    "dateUpdated": "2026-10-19T09:01:29.794Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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