CVE-2025-38502bpf: Fix oob access in cgroup local storage
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 7d9c3427894fe70d1347b4820476bf37736d2ff0 before c1c74584b9b4043c52e41fec415226e582d266a3; from 7d9c3427894fe70d1347b4820476bf37736d2ff0 before 66da7cee78590259b400e51a70622ccd41da7bb2; 7d9c3427894fe70d1347b4820476bf37736d2ff0 builds before 7acfa07c585e3d7a64654d38f0a5c762877d0b9b; from 7d9c3427894fe70d1347b4820476bf37736d2ff0 before 41688d1fc5d163a6c2c0e95c0419e2cb31a44648; from 7d9c3427894fe70d1347b4820476bf37736d2ff0 before 19341d5c59e8c7e8528e40f8663e99d67810473c; from 7d9c3427894fe70d1347b4820476bf37736d2ff0 before abad3d0bad72a52137e0c350c59542d75ae4f513 | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.9 before 5.15.192; from 5.16 before 6.1.151; from 6.2 before 6.6.105; from 6.7 before 6.12.46; from 6.13 before 6.16.1 | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
siemens simatic_cn_4100_firmware siemens:simatic_cn_4100_firmware | before 5.0 | NVD |
References
- https://git.kernel.org/stable/c/c1c74584b9b4043c52e41fec415226e582d266a3patch
- https://git.kernel.org/stable/c/66da7cee78590259b400e51a70622ccd41da7bb2patch
- https://git.kernel.org/stable/c/7acfa07c585e3d7a64654d38f0a5c762877d0b9bpatch
- https://git.kernel.org/stable/c/41688d1fc5d163a6c2c0e95c0419e2cb31a44648patch
- https://git.kernel.org/stable/c/19341d5c59e8c7e8528e40f8663e99d67810473cpatch
- https://git.kernel.org/stable/c/abad3d0bad72a52137e0c350c59542d75ae4f513patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlmailing-list, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.htmlthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.