{"id":"CVE-2025-38481","state":"PUBLISHED","title":"comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large\n\nThe handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to\nhold the array of `struct comedi_insn`, getting the length from the\n`n_insns` member of the `struct comedi_insnlist` supplied by the user.\nThe allocation will fail with a WARNING and a stack dump if it is too\nlarge.\n\nAvoid that by failing with an `-EINVAL` error if the supplied `n_insns`\nvalue is unreasonable.\n\nDefine the limit on the `n_insns` value in the `MAX_INSNS` macro.  Set\nthis to the same value as `MAX_SAMPLES` (65536), which is the maximum\nallowed sum of the values of the member `n` in the array of `struct\ncomedi_insn`, and sensible comedi instructions will have an `n` of at\nleast 1.","publishedAt":"2025-07-28T11:21:46.147Z","updatedAt":"2026-05-11T21:28:50.751Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"454d732dfd0aef7d7aa950c409215ca06d717e93","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"c68257588e87f45530235701a42496b7e9e56adb","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"69dc06b9514522de532e997a21d035cd29b0db44","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"c9d3d9667443caafa804cd07940aeaef8e53aa90","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"992d600f284e719242a434166e86c1999649b71c","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"e3b8322cc8081d142ee4c1a43e1d702bdba1ed76","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"08ae4b20f5e82101d77326ecab9089e110f224cc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/comedi_fops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.4.297","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.241","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.190","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.147","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.100","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.40","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.8","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/comedi_fops.c"]}],"references":["https://git.kernel.org/stable/c/454d732dfd0aef7d7aa950c409215ca06d717e93","https://git.kernel.org/stable/c/c68257588e87f45530235701a42496b7e9e56adb","https://git.kernel.org/stable/c/69dc06b9514522de532e997a21d035cd29b0db44","https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3","https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90","https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c","https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76","https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc","https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38481.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38481","state":"PUBLISHED","datePublished":"2025-07-28T11:21:46.147Z","dateUpdated":"2026-05-11T21:28:50.751Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:24.021Z"},"containers":{"cna":{"title":"comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large\n\nThe handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to\nhold the array of `struct comedi_insn`, getting the length from the\n`n_insns` member of the `struct comedi_insnlist` supplied by the user.\nThe allocation will fail with a WARNING and a stack dump if it is too\nlarge.\n\nAvoid that by failing with an `-EINVAL` error if the supplied `n_insns`\nvalue is unreasonable.\n\nDefine the limit on the `n_insns` value in the `MAX_INSNS` macro.  Set\nthis to the same value as `MAX_SAMPLES` (65536), which is the maximum\nallowed sum of the values of the member `n` in the array of `struct\ncomedi_insn`, and sensible comedi instructions will have an `n` of at\nleast 1."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"454d732dfd0aef7d7aa950c409215ca06d717e93","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"c68257588e87f45530235701a42496b7e9e56adb","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"69dc06b9514522de532e997a21d035cd29b0db44","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"c9d3d9667443caafa804cd07940aeaef8e53aa90","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"992d600f284e719242a434166e86c1999649b71c","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"e3b8322cc8081d142ee4c1a43e1d702bdba1ed76","versionType":"git"},{"version":"ed9eccbe8970f6eedc1b978c157caf1251a896d4","status":"affected","lessThan":"08ae4b20f5e82101d77326ecab9089e110f224cc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/comedi_fops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.4.297","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.241","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.190","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.147","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.100","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.40","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.8","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/comedi_fops.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/454d732dfd0aef7d7aa950c409215ca06d717e93"},{"url":"https://git.kernel.org/stable/c/c68257588e87f45530235701a42496b7e9e56adb"},{"url":"https://git.kernel.org/stable/c/69dc06b9514522de532e997a21d035cd29b0db44"},{"url":"https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3"},{"url":"https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90"},{"url":"https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c"},{"url":"https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76"},{"url":"https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:28:50.751Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.4.297"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.241"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.15.190"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.1.147"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.6.100"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.12.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.15.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE 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