{"id":"CVE-2026-74379","state":"PUBLISHED","title":"dax/kmem: account for partial discontiguous resource upon removal","description":"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 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.","publishedAt":"2026-08-15T05:58:57.024Z","updatedAt":"2026-08-17T05:18:16.387Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"ef4fc53898bd6c4d0119cc6d419ebef7f2560f31","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"d47b0b8a69a13e06afafa54723f3e8c99b0c788f","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"799e54c510a03a65a57627018a817838d72f35bd","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"598ed7393a639c7547b28ff3e14db9f1ac37c132","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"30ea97affbcce236c57287c82dc6ef7a29c63b76","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"8aa442cfce79e2d69e72fc8e0c0864ac2971149d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/kmem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/kmem.c"]}],"references":["https://git.kernel.org/stable/c/ef4fc53898bd6c4d0119cc6d419ebef7f2560f31","https://git.kernel.org/stable/c/5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb","https://git.kernel.org/stable/c/d47b0b8a69a13e06afafa54723f3e8c99b0c788f","https://git.kernel.org/stable/c/799e54c510a03a65a57627018a817838d72f35bd","https://git.kernel.org/stable/c/598ed7393a639c7547b28ff3e14db9f1ac37c132","https://git.kernel.org/stable/c/30ea97affbcce236c57287c82dc6ef7a29c63b76","https://git.kernel.org/stable/c/8aa442cfce79e2d69e72fc8e0c0864ac2971149d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74379.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74379","state":"PUBLISHED","datePublished":"2026-08-15T05:58:57.024Z","dateUpdated":"2026-08-17T05:18:16.387Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.890Z"},"containers":{"cna":{"title":"dax/kmem: account for partial discontiguous resource upon removal","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"ef4fc53898bd6c4d0119cc6d419ebef7f2560f31","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"d47b0b8a69a13e06afafa54723f3e8c99b0c788f","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"799e54c510a03a65a57627018a817838d72f35bd","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"598ed7393a639c7547b28ff3e14db9f1ac37c132","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"30ea97affbcce236c57287c82dc6ef7a29c63b76","versionType":"git"},{"version":"60e93dc097f7f13a16a7e4b75b8803eb2adbb721","status":"affected","lessThan":"8aa442cfce79e2d69e72fc8e0c0864ac2971149d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/kmem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/kmem.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:18:16.387Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}