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bpf: Fix oob access in cgroup local storage

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix oob access in cgroup local storage Lonial reported that an out-of-bounds access in cgroup local storage can be crafted via tail calls. Given two programs each utilizing a cgroup local storage with a different value size, and one program doing a tail call into the other. The verifier will validate each of the indivial programs just fine. However, in the runtime context the bpf_cg_run_ctx holds an bpf_prog_array_item which contains the BPF program as well as any cgroup local storage flavor the program uses. Helpers such as bpf_get_local_storage() pick this up from the runtime context: ctx = container_of(current->bpf_ctx, struct bpf_cg_run_ctx, run_ctx); storage = ctx->prog_item->cgroup_storage[stype]; if (stype == BPF_CGROUP_STORAGE_SHARED) ptr = &READ_ONCE(storage->buf)->data[0]; else ptr = this_cpu_ptr(storage->percpu_buf); For the second program which was called from the originally attached one, this means bpf_get_local_storage() will pick up the former program's map, not its own. With mismatching sizes, this can result in an unintended out-of-bounds access. To fix this issue, we need to extend bpf_map_owner with an array of storage_cookie[] to match on i) the exact maps from the original program if the second program was using bpf_get_local_storage(), or ii) allow the tail call combination if the second program was not using any of the cgroup local storage maps.

Announced Source revision 1
Original source ↗

CVE-2025-38502

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-38502

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
        "lessThan": "c1c74584b9b4043c52e41fec415226e582d266a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
        "lessThan": "66da7cee78590259b400e51a70622ccd41da7bb2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
        "lessThan": "7acfa07c585e3d7a64654d38f0a5c762877d0b9b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
        "lessThan": "41688d1fc5d163a6c2c0e95c0419e2cb31a44648",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
        "lessThan": "19341d5c59e8c7e8528e40f8663e99d67810473c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7d9c3427894fe70d1347b4820476bf37736d2ff0",
        "lessThan": "abad3d0bad72a52137e0c350c59542d75ae4f513",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/linux/bpf.h",
      "kernel/bpf/core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.192",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.1",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/linux/bpf.h",
      "kernel/bpf/core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38502

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30582 · Revision 1
Added to Heist Feed
Publisher date
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