{"id":"CVE-2026-74379","title":"dax/kmem: account for partial discontiguous resource upon removal","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndax/kmem: account for partial discontiguous resource upon removal\n\nWhen dev_dax_kmem_probe() partially succeeds (at least one range is\nmapped) but a subsequent range fa…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < ef4fc53898bd6c4d0119cc6d419ebef7f2560f31","Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb","Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < d47b0b8a69a13e06afafa54723f3e8c99b0c788f","Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 799e54c510a03a65a57627018a817838d72f35bd","Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 598ed7393a639c7547b28ff3e14db9f1ac37c132","Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 30ea97affbcce236c57287c82dc6ef7a29c63b76","Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 8aa442cfce79e2d69e72fc8e0c0864ac2971149d","Linux 5.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:56:42.795588Z"},"published":"2026-08-15","updated":"2026-11-06","sourceUpdated":"2026-11-06T17:05:44.980Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74379","references":[{"url":"https://git.kernel.org/stable/c/ef4fc53898bd6c4d0119cc6d419ebef7f2560f31"},{"url":"https://git.kernel.org/stable/c/5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb"},{"url":"https://git.kernel.org/stable/c/d47b0b8a69a13e06afafa54723f3e8c99b0c788f"},{"url":"https://git.kernel.org/stable/c/799e54c510a03a65a57627018a817838d72f35bd"},{"url":"https://git.kernel.org/stable/c/598ed7393a639c7547b28ff3e14db9f1ac37c132"},{"url":"https://git.kernel.org/stable/c/30ea97affbcce236c57287c82dc6ef7a29c63b76"},{"url":"https://git.kernel.org/stable/c/8aa442cfce79e2d69e72fc8e0c0864ac2971149d"}],"tags":["cve.org"],"epss":0.00173,"epssPercentile":0.06717,"ingestedAt":"2026-11-06T18:00:12.565Z","slug":"CVE-2026-74379","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndax/kmem: account for partial discontiguous resource upon removal\n\nWhen dev_dax_kmem_probe() partially succeeds (at least one range is\nmapped) but a subsequent range fails request_mem_region() or\nadd_memory_driver_managed(), the probe silently continues, ultimately\nreturning success, but with the corresponding range resource NULL'ed out.\n\ndev_dax_kmem_remove() iterates over all dax_device ranges regardless of if\nthe underlying resource exists.  When remove_memory() is called later, it\nreturns 0 because the memory was never added which causes\ndev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can\nbe removed and attempts cleanup on a NULL pointer.\n\nFix this by skipping these ranges altogether, noting that these cases are\nconsidered success, such that the cleanup is still reached when all\nactually-added ranges are successfully removed.\n\n## Affected\n\n- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < ef4fc53898bd6c4d0119cc6d419ebef7f2560f31`\n- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb`\n- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < d47b0b8a69a13e06afafa54723f3e8c99b0c788f`\n- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 799e54c510a03a65a57627018a817838d72f35bd`\n- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 598ed7393a639c7547b28ff3e14db9f1ac37c132`\n- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 30ea97affbcce236c57287c82dc6ef7a29c63b76`\n- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 8aa442cfce79e2d69e72fc8e0c0864ac2971149d`\n- `Linux 5.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}