{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-68257", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-68257", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-12-16T14:44:59.535Z", "updatedAt": "2026-05-11T21:49:52.497Z", "importedAt": "2026-10-24T01:57:44.935Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "comedi: check device's attached status in compat ioctls", "summary": "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 \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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "4836ba483a22ebd076c8faaf8293a7295fad4142" }, { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "7141915bf0c41cb57d83cdbaf695b8c731b16b71" }, { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "f13895c03620933a58907e3250016f087e39b78c" }, { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "b975f91de5f8f63cf490f0393775cc795f8b0557" }, { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "f6e629dfe6f590091c662a87c9fcf118b1c1c7dc" }, { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "573b07d2e3d473ee7eb625ef87519922cf01168d" }, { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "aac80e912de306815297a3b74f0426873ffa7dc3" }, { "version": "3fbfd2223a271426509830e6340c386a1054cfad", "status": "affected", "versionType": "git", "lessThan": "0de7d9cd07a2671fa6089173bccc0b2afe6b93ee" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.8" }, { "version": "5.10.248", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.198", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.160", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.120", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.62", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.17.12", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.17.*" }, { "version": "6.18.1", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }