{ "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-2025-40134", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-40134", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-11-12T10:23:22.771Z", "updatedAt": "2026-05-11T21:43:24.586Z", "importedAt": "2026-10-24T01:57:34.152Z", "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": "dm: fix NULL pointer dereference in __dm_suspend()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix NULL pointer dereference in __dm_suspend()\n\nThere is a race condition between dm device suspend and table load that\ncan lead to null pointer dereference. The issue occurs when suspend is\ninvoked before table load completes:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000054\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 6 PID: 6798 Comm: dmsetup Not tainted 6.6.0-g7e52f5f0ca9b #62\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014\nRIP: 0010:blk_mq_wait_quiesce_done+0x0/0x50\nCall Trace:\n \n blk_mq_quiesce_queue+0x2c/0x50\n dm_stop_queue+0xd/0x20\n __dm_suspend+0x130/0x330\n dm_suspend+0x11a/0x180\n dev_suspend+0x27e/0x560\n ctl_ioctl+0x4cf/0x850\n dm_ctl_ioctl+0xd/0x20\n vfs_ioctl+0x1d/0x50\n __se_sys_ioctl+0x9b/0xc0\n __x64_sys_ioctl+0x19/0x30\n x64_sys_call+0x2c4a/0x4620\n do_syscall_64+0x9e/0x1b0\n\nThe issue can be triggered as below:\n\nT1 \t\t\t\t\t\tT2\ndm_suspend\t\t\t\t\ttable_load\n__dm_suspend\t\t\t\t\tdm_setup_md_queue\n\t\t\t\t\t\tdm_mq_init_request_queue\n\t\t\t\t\t\tblk_mq_init_allocated_queue\n\t\t\t\t\t\t=> q->mq_ops = set->ops; (1)\ndm_stop_queue / dm_wait_for_completion\n=> q->tag_set NULL pointer!\t(2)\n\t\t\t\t\t\t=> q->tag_set = set; (3)\n\nFix this by checking if a valid table (map) exists before performing\nrequest-based suspend and waiting for target I/O. When map is NULL,\nskip these table-dependent suspend steps.\n\nEven when map is NULL, no I/O can reach any target because there is\nno table loaded; I/O submitted in this state will fail early in the\nDM layer. Skipping the table-dependent suspend logic in this case\nis safe and avoids NULL pointer dereferences.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "9dc43ea6a20ff83fe9a5fe4be47ae0fbf2409b98" }, { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "30f95b7eda5966b81cb221bd569c0f095a068cf6" }, { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "a0e54bd8d7ea79127fe9920df3ae36f85e79ac7c" }, { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "a802901b75e13cc306f1b7ab0f062135c8034e9e" }, { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "846cafc4725ca727d94f9c4b5f789c1a7c8fb6fe" }, { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "19ca4528666990be376ac3eb6fe667b03db5324d" }, { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "331c2dd8ca8bad1a3ac10cce847ffb76158eece4" }, { "version": "c4576aed8d85d808cd6443bda58393d525207d01", "status": "affected", "versionType": "git", "lessThan": "8d33a030c566e1f105cd5bf27f37940b6367f3be" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.0" }, { "version": "5.4.301", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.246", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.195", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.156", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.112", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.53", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.17.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.17.*" }, { "version": "6.18", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }