bpf: Fix oob access in cgroup local storage
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.
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
- Not stated in this record
- Prerequisites
- Not stated in this record
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