{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68335","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-16T14:48:05.297Z","datePublished":"2025-12-22T16:14:12.614Z","dateUpdated":"2026-05-11T21:51:12.073Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:51:12.073Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()\n\nSyzbot identified an issue [1] in pcl818_ai_cancel(), which stems from\nthe fact that in case of early device detach via pcl818_detach(),\nsubdevice dev->read_subdev may not have initialized its pointer to\n&struct comedi_async as intended. Thus, any such dereferencing of\n&s->async->cmd will lead to general protection fault and kernel crash.\n\nMitigate this problem by removing a call to pcl818_ai_cancel() from\npcl818_detach() altogether. This way, if the subdevice setups its\nsupport for async commands, everything async-related will be\nhandled via subdevice's own ->cancel() function in\ncomedi_device_detach_locked() even before pcl818_detach(). If no\nsupport for asynchronous commands is provided, there is no need\nto cancel anything either.\n\n[1] Syzbot crash:\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\nCPU: 1 UID: 0 PID: 6050 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025\nRIP: 0010:pcl818_ai_cancel+0x69/0x3f0 drivers/comedi/drivers/pcl818.c:762\n...\nCall Trace:\n <TASK>\n pcl818_detach+0x66/0xd0 drivers/comedi/drivers/pcl818.c:1115\n comedi_device_detach_locked+0x178/0x750 drivers/comedi/drivers.c:207\n do_devconfig_ioctl drivers/comedi/comedi_fops.c:848 [inline]\n comedi_unlocked_ioctl+0xcde/0x1020 drivers/comedi/comedi_fops.c:2178\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [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/drivers/pcl818.c"],"versions":[{"version":"00aba6e7b5653a6607238ecdab7172318059d984","lessThan":"b2a5b172dc05be6c4f2c5542c1bbc6b14d60ff16","status":"affected","versionType":"git"},{"version":"00aba6e7b5653a6607238ecdab7172318059d984","lessThan":"935ad4b3c325c24fff2c702da403283025ffc722","status":"affected","versionType":"git"},{"version":"00aba6e7b5653a6607238ecdab7172318059d984","lessThan":"88d99ca5adbd01ff088f5fb2ddeba5755e085e52","status":"affected","versionType":"git"},{"version":"00aba6e7b5653a6607238ecdab7172318059d984","lessThan":"5caa40e7c6a43e08e3574f990865127705c22861","status":"affected","versionType":"git"},{"version":"00aba6e7b5653a6607238ecdab7172318059d984","lessThan":"d948c53dec36dafe182631457597c49c1f1df5ea","status":"affected","versionType":"git"},{"version":"00aba6e7b5653a6607238ecdab7172318059d984","lessThan":"877adccfacb32687b90714a27cfb09f444fdfa16","status":"affected","versionType":"git"},{"version":"00aba6e7b5653a6607238ecdab7172318059d984","lessThan":"a51f025b5038abd3d22eed2ede4cd46793d89565","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/drivers/pcl818.c"],"versions":[{"version":"3.15","status":"affected"},{"version":"0","lessThan":"3.15","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":"3.15","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.12.62"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.17.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.18.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b2a5b172dc05be6c4f2c5542c1bbc6b14d60ff16"},{"url":"https://git.kernel.org/stable/c/935ad4b3c325c24fff2c702da403283025ffc722"},{"url":"https://git.kernel.org/stable/c/88d99ca5adbd01ff088f5fb2ddeba5755e085e52"},{"url":"https://git.kernel.org/stable/c/5caa40e7c6a43e08e3574f990865127705c22861"},{"url":"https://git.kernel.org/stable/c/d948c53dec36dafe182631457597c49c1f1df5ea"},{"url":"https://git.kernel.org/stable/c/877adccfacb32687b90714a27cfb09f444fdfa16"},{"url":"https://git.kernel.org/stable/c/a51f025b5038abd3d22eed2ede4cd46793d89565"}],"title":"comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()","x_generator":{"engine":"bippy-1.2.0"}}}}