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CVE-2025-38478— comedi: Fix initialization of data for instructions that write to subdevice

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，该漏洞源于未初始化指令数据，可能导致无效访问。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ed9eccbe8970f6eedc1b978c157caf1251a896d4< 6f38c6380c3b38a05032b8881e41137385a6ce02 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 13e4d9038a1e869445a996a3f604a84ef52fe8f4 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 020eed5681d0f9bced73970368078a92d6cfaa9c affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< d3436638738ace8f101af7bdee2eae1bc38e9b29 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 673ee92bd2d31055bca98a1d96b653f5284289c4 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< c42116dc70af6664526f7aa82cf937824ab42649 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 46d8c744136ce2454aa4c35c138cc06817f92b8e affected
… +10 more rows
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I. Basic Information for CVE-2025-38478

Vulnerability Information
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Vulnerability Title
comedi: Fix initialization of data for instructions that write to subdevice
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: comedi: Fix initialization of data for instructions that write to subdevice Some Comedi subdevice instruction handlers are known to access instruction data elements beyond the first `insn->n` elements in some cases. The `do_insn_ioctl()` and `do_insnlist_ioctl()` functions allocate at least `MIN_SAMPLES` (16) data elements to deal with this, but they do not initialize all of that. For Comedi instruction codes that write to the subdevice, the first `insn->n` data elements are copied from user-space, but the remaining elements are left uninitialized. That could be a problem if the subdevice instruction handler reads the uninitialized data. Ensure that the first `MIN_SAMPLES` elements are initialized before calling these instruction handlers, filling the uncopied elements with 0. For `do_insnlist_ioctl()`, the same data buffer elements are used for handling a list of instructions, so ensure the first `MIN_SAMPLES` elements are initialized for each instruction that writes to the subdevice.
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，该漏洞源于未初始化指令数据，可能导致无效访问。
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 ~ 6f38c6380c3b38a05032b8881e41137385a6ce02 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2025-38478

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III. Intelligence Information for CVE-2025-38478

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

CVE-2025-38488 9.8 CRITICAL smb: client: fix use-after-free in crypt_message when using async crypto
CVE-2025-38490 9.8 CRITICAL net: libwx: remove duplicate page_pool_put_full_page()
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-2025-38477 7.8 HIGH net/sched: sch_qfq: Fix race condition on qfq_aggregate
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-2025-38475 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
CVE-2025-38489 s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL again

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-2025-38478

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