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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.

PUBLISHED Reserved 2025-04-16 | Published 2025-07-28 | Updated 2026-05-11 | Assigner Linux

Product status

Default status
unaffected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 454d732dfd0aef7d7aa950c409215ca06d717e93
affected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before c68257588e87f45530235701a42496b7e9e56adb
affected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 69dc06b9514522de532e997a21d035cd29b0db44
affected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3
affected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before c9d3d9667443caafa804cd07940aeaef8e53aa90
affected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 992d600f284e719242a434166e86c1999649b71c
affected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before e3b8322cc8081d142ee4c1a43e1d702bdba1ed76
affected

ed9eccbe8970f6eedc1b978c157caf1251a896d4 (git) before 08ae4b20f5e82101d77326ecab9089e110f224cc
affected

Default status
affected

2.6.29
affected

Any version before 2.6.29
unaffected

5.4.297 (semver)
unaffected

5.10.241 (semver)
unaffected

5.15.190 (semver)
unaffected

6.1.147 (semver)
unaffected

6.6.100 (semver)
unaffected

6.12.40 (semver)
unaffected

6.15.8 (semver)
unaffected

6.16 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/10/msg00008.html

lists.debian.org/debian-lts-announce/2025/10/msg00007.html

git.kernel.org/...c/454d732dfd0aef7d7aa950c409215ca06d717e93

git.kernel.org/...c/c68257588e87f45530235701a42496b7e9e56adb

git.kernel.org/...c/69dc06b9514522de532e997a21d035cd29b0db44

git.kernel.org/...c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3

git.kernel.org/...c/c9d3d9667443caafa804cd07940aeaef8e53aa90

git.kernel.org/...c/992d600f284e719242a434166e86c1999649b71c

git.kernel.org/...c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76

git.kernel.org/...c/08ae4b20f5e82101d77326ecab9089e110f224cc

cve.org (CVE-2025-38481)

nvd.nist.gov (CVE-2025-38481)

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