CVE-2025-38478 (GCVE-0-2025-38478)

Vulnerability from cvelistv5 – Published: 2025-07-28 11:21 – Updated: 2025-11-03 17:38
VLAI?
Title
comedi: Fix initialization of data for instructions that write to subdevice
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 6f38c6380c3b38a05032b8881e41137385a6ce02 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 13e4d9038a1e869445a996a3f604a84ef52fe8f4 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 020eed5681d0f9bced73970368078a92d6cfaa9c (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < d3436638738ace8f101af7bdee2eae1bc38e9b29 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 673ee92bd2d31055bca98a1d96b653f5284289c4 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < c42116dc70af6664526f7aa82cf937824ab42649 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 46d8c744136ce2454aa4c35c138cc06817f92b8e (git)
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    Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.147 , ≤ 6.1.* (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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