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CVE-2025-38502— bpf: Fix oob access in cgroup local storage

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cgroup本地存储存在越界访问，可能导致执行任意代码。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 7d9c3427894fe70d1347b4820476bf37736d2ff0< c1c74584b9b4043c52e41fec415226e582d266a3 affected
7d9c3427894fe70d1347b4820476bf37736d2ff0< 66da7cee78590259b400e51a70622ccd41da7bb2 affected
7d9c3427894fe70d1347b4820476bf37736d2ff0< 7acfa07c585e3d7a64654d38f0a5c762877d0b9b affected
7d9c3427894fe70d1347b4820476bf37736d2ff0< 41688d1fc5d163a6c2c0e95c0419e2cb31a44648 affected
7d9c3427894fe70d1347b4820476bf37736d2ff0< 19341d5c59e8c7e8528e40f8663e99d67810473c affected
7d9c3427894fe70d1347b4820476bf37736d2ff0< abad3d0bad72a52137e0c350c59542d75ae4f513 affected
5.9 affected
< 5.9 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-38502

Vulnerability Information
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Vulnerability Title
bpf: Fix oob access in cgroup local storage
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cgroup本地存储存在越界访问，可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7d9c3427894fe70d1347b4820476bf37736d2ff0 ~ c1c74584b9b4043c52e41fec415226e582d266a3 -
Linux Linux 5.9 -

II. Public POCs for CVE-2025-38502

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III. Intelligence Information for CVE-2025-38502

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Same Patch Batch · Linux · 2025-08-16 · 59 CVEs total

CVE-2025-38527 9.8 CRITICAL smb: client: fix use-after-free in cifs_oplock_break
CVE-2025-38533 9.8 CRITICAL net: libwx: fix the using of Rx buffer DMA
CVE-2025-38552 9.4 CRITICAL mptcp: plug races between subflow fail and subflow creation
CVE-2023-3867 9.1 CRITICAL ksmbd: fix out of bounds read in smb2_sess_setup
CVE-2023-4515 9.1 CRITICAL ksmbd: validate command request size
CVE-2023-32249 9.1 CRITICAL ksmbd: not allow guest user on multichannel
CVE-2025-38511 8.8 HIGH drm/xe/pf: Clear all LMTT pages on alloc
CVE-2025-38512 8.8 HIGH wifi: prevent A-MSDU attacks in mesh networks
CVE-2023-4130 8.1 HIGH ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()
CVE-2023-3865 8.1 HIGH ksmbd: fix out-of-bound read in smb2_write
CVE-2025-38536 7.8 HIGH net: airoha: fix potential use-after-free in airoha_npu_get()
CVE-2025-38542 7.8 HIGH net: appletalk: Fix device refcount leak in atrtr_create()
CVE-2025-38532 7.8 HIGH net: libwx: properly reset Rx ring descriptor
CVE-2025-38539 7.8 HIGH tracing: Add down_write(trace_event_sem) when adding trace event
CVE-2025-38550 7.8 HIGH ipv6: mcast: Delay put pmc->idev in mld_del_delrec()
CVE-2025-38523 7.5 HIGH cifs: Fix the smbd_response slab to allow usercopy
CVE-2025-38501 7.5 HIGH ksmbd: limit repeated connections from clients with the same IP
CVE-2025-38514 7.5 HIGH rxrpc: Fix oops due to non-existence of prealloc backlog struct
CVE-2025-38526 7.5 HIGH ice: add NULL check in eswitch lag check
CVE-2025-38524 7.5 HIGH rxrpc: Fix recv-recv race of completed call

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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