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CVE-2025-38481— comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large

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，该漏洞源于未验证n_insns大小，可能导致内存分配失败。

AI Predicted 4.3 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ed9eccbe8970f6eedc1b978c157caf1251a896d4< 454d732dfd0aef7d7aa950c409215ca06d717e93 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< c68257588e87f45530235701a42496b7e9e56adb affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 69dc06b9514522de532e997a21d035cd29b0db44 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< c9d3d9667443caafa804cd07940aeaef8e53aa90 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 992d600f284e719242a434166e86c1999649b71c affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< e3b8322cc8081d142ee4c1a43e1d702bdba1ed76 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 08ae4b20f5e82101d77326ecab9089e110f224cc affected
… +10 more rows
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I. Basic Information for CVE-2025-38481

Vulnerability Information
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Vulnerability Title
comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to hold the array of `struct comedi_insn`, getting the length from the `n_insns` member of the `struct comedi_insnlist` supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large. Avoid that by failing with an `-EINVAL` error if the supplied `n_insns` value is unreasonable. Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set this to the same value as `MAX_SAMPLES` (65536), which is the maximum allowed sum of the values of the member `n` in the array of `struct comedi_insn`, and sensible comedi instructions will have an `n` of at least 1.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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，该漏洞源于未验证n_insns大小，可能导致内存分配失败。
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 ed9eccbe8970f6eedc1b978c157caf1251a896d4 ~ 454d732dfd0aef7d7aa950c409215ca06d717e93 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2025-38481

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III. Intelligence Information for CVE-2025-38481

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Same Patch Batch · Linux · 2025-07-28 · 29 CVEs total

CVE-2025-38490 9.8 CRITICAL net: libwx: remove duplicate page_pool_put_full_page()
CVE-2025-38488 9.8 CRITICAL smb: client: fix use-after-free in crypt_message when using async crypto
CVE-2025-38471 9.8 CRITICAL tls: always refresh the queue when reading sock
CVE-2025-38472 9.8 CRITICAL netfilter: nf_conntrack: fix crash due to removal of uninitialised entry
CVE-2025-38476 9.8 CRITICAL rpl: Fix use-after-free in rpl_do_srh_inline().
CVE-2025-38495 8.8 HIGH HID: core: ensure the allocated report buffer can contain the reserved report ID
CVE-2025-38491 8.2 HIGH mptcp: make fallback action and fallback decision atomic
CVE-2025-38478 7.8 HIGH comedi: Fix initialization of data for instructions that write to subdevice
CVE-2025-38485 7.8 HIGH iio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush
CVE-2025-38486 7.8 HIGH soundwire: Revert "soundwire: qcom: Add set_channel_map api support"
CVE-2025-38484 7.8 HIGH iio: backend: fix out-of-bound write
CVE-2025-38494 7.8 HIGH HID: core: do not bypass hid_hw_raw_request
CVE-2025-38477 7.8 HIGH net/sched: sch_qfq: Fix race condition on qfq_aggregate
CVE-2025-38475 7.8 HIGH smc: Fix various oops due to inet_sock type confusion.
CVE-2025-38470 7.8 HIGH net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime
CVE-2025-38493 tracing/osnoise: Fix crash in timerlat_dump_stack()
CVE-2025-38492 netfs: Fix race between cache write completion and ALL_QUEUED being set
CVE-2025-38497 usb: gadget: configfs: Fix OOB read on empty string write
CVE-2025-38496 dm-bufio: fix sched in atomic context
CVE-2025-38468 net/sched: Return NULL when htb_lookup_leaf encounters an empty rbtree

Showing top 20 of 29 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38481

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