{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68257","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-16T13:41:40.267Z","datePublished":"2025-12-16T14:44:59.535Z","dateUpdated":"2026-05-11T21:49:52.497Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:49:52.497Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: check device's attached status in compat ioctls\n\nSyzbot identified an issue [1] that crashes kernel, seemingly due to\nunexistent callback dev->get_valid_routes(). By all means, this should\nnot occur as said callback must always be set to\nget_zero_valid_routes() in __comedi_device_postconfig().\n\nAs the crash seems to appear exclusively in i386 kernels, at least,\njudging from [1] reports, the blame lies with compat versions\nof standard IOCTL handlers. Several of them are modified and\ndo not use comedi_unlocked_ioctl(). While functionality of these\nioctls essentially copy their original versions, they do not\nhave required sanity check for device's attached status. This,\nin turn, leads to a possibility of calling select IOCTLs on a\ndevice that has not been properly setup, even via COMEDI_DEVCONFIG.\n\nDoing so on unconfigured devices means that several crucial steps\nare missed, for instance, specifying dev->get_valid_routes()\ncallback.\n\nFix this somewhat crudely by ensuring device's attached status before\nperforming any ioctls, improving logic consistency between modern\nand compat functions.\n\n[1] Syzbot report:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nCR2: ffffffffffffffd6 CR3: 000000006c717000 CR4: 0000000000352ef0\nCall Trace:\n <TASK>\n get_valid_routes drivers/comedi/comedi_fops.c:1322 [inline]\n parse_insn+0x78c/0x1970 drivers/comedi/comedi_fops.c:1401\n do_insnlist_ioctl+0x272/0x700 drivers/comedi/comedi_fops.c:1594\n compat_insnlist drivers/comedi/comedi_fops.c:3208 [inline]\n comedi_compat_ioctl+0x810/0x990 drivers/comedi/comedi_fops.c:3273\n __do_compat_sys_ioctl fs/ioctl.c:695 [inline]\n __se_compat_sys_ioctl fs/ioctl.c:638 [inline]\n __ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:638\n do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]\n..."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/comedi_fops.c"],"versions":[{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"4836ba483a22ebd076c8faaf8293a7295fad4142","status":"affected","versionType":"git"},{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"7141915bf0c41cb57d83cdbaf695b8c731b16b71","status":"affected","versionType":"git"},{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"f13895c03620933a58907e3250016f087e39b78c","status":"affected","versionType":"git"},{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"b975f91de5f8f63cf490f0393775cc795f8b0557","status":"affected","versionType":"git"},{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"f6e629dfe6f590091c662a87c9fcf118b1c1c7dc","status":"affected","versionType":"git"},{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"573b07d2e3d473ee7eb625ef87519922cf01168d","status":"affected","versionType":"git"},{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"aac80e912de306815297a3b74f0426873ffa7dc3","status":"affected","versionType":"git"},{"version":"3fbfd2223a271426509830e6340c386a1054cfad","lessThan":"0de7d9cd07a2671fa6089173bccc0b2afe6b93ee","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/comedi_fops.c"],"versions":[{"version":"5.8","status":"affected"},{"version":"0","lessThan":"5.8","status":"unaffected","versionType":"semver"},{"version":"5.10.248","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.198","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.160","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.120","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.62","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.17.12","lessThanOrEqual":"6.17.*","status":"unaffected","versionType":"semver"},{"version":"6.18.1","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.10.248"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.12.62"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.17.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.18.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4836ba483a22ebd076c8faaf8293a7295fad4142"},{"url":"https://git.kernel.org/stable/c/7141915bf0c41cb57d83cdbaf695b8c731b16b71"},{"url":"https://git.kernel.org/stable/c/f13895c03620933a58907e3250016f087e39b78c"},{"url":"https://git.kernel.org/stable/c/b975f91de5f8f63cf490f0393775cc795f8b0557"},{"url":"https://git.kernel.org/stable/c/f6e629dfe6f590091c662a87c9fcf118b1c1c7dc"},{"url":"https://git.kernel.org/stable/c/573b07d2e3d473ee7eb625ef87519922cf01168d"},{"url":"https://git.kernel.org/stable/c/aac80e912de306815297a3b74f0426873ffa7dc3"},{"url":"https://git.kernel.org/stable/c/0de7d9cd07a2671fa6089173bccc0b2afe6b93ee"}],"title":"comedi: check device's attached status in compat ioctls","x_generator":{"engine":"bippy-1.2.0"}}}}