bpf: Fix oob access in cgroup local storage

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38502
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-08-16 10:15:25 UTC
Updated2026-06-01 12:24:50 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Problem Types: CWE-125

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 c1c74584b9b4043c52e41fec415226e582d266a3 git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 66da7cee78590259b400e51a70622ccd41da7bb2 git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 7acfa07c585e3d7a64654d38f0a5c762877d0b9b git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 41688d1fc5d163a6c2c0e95c0419e2cb31a44648 git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 19341d5c59e8c7e8528e40f8663e99d67810473c git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 abad3d0bad72a52137e0c350c59542d75ae4f513 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 5.15.192 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.151 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.105 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.46 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.1 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/abad3d0bad72a52137e0c350c59542d75ae4f513 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/19341d5c59e8c7e8528e40f8663e99d67810473c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/7acfa07c585e3d7a64654d38f0a5c762877d0b9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com Third Party Advisory
git.kernel.org/stable/c/41688d1fc5d163a6c2c0e95c0419e2cb31a44648 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c1c74584b9b4043c52e41fec415226e582d266a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/66da7cee78590259b400e51a70622ccd41da7bb2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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