{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46327", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.112Z", "datePublished": "2026-06-09T12:25:54.781Z", "dateUpdated": "2026-08-05T12:31:22.716Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:22.716Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix unlocked test for dm_suspended_md\n\nThe function dm_blk_report_zones tests if the device is suspended with\nthe \"dm_suspended_md\" call. However, this function is called without\nholding any locks, so the device may be suspended just after it.\n\nMove the call to dm_suspended_md after dm_get_live_table, so that the\ndevice can't be suspended after the suspended state was tested." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached only through local block-layer ioctls (BLKREPORTZONE/BLKREPORTZONEV2 via blkdev_report_zones_ioctl) and device-mapper control ioctls that trigger dm_swap_table/dm_revalidate_zones; there is no network-facing entry point.\nAC:L - Exploitation is a TOCTOU race between concurrent BLKREPORTZONE calls and a zoned dm table activation/revalidation; an attacker can control both sides by running parallel threads and retrying until the window is hit, without depending on uncontrollable timing or memory layout.\nPR:L - Triggering dm table load/swap and zone revalidation requires CAP_SYS_ADMIN, which is obtainable by an unprivileged user inside a user namespace (unshare -Urn); BLKREPORTZONE additionally requires read access to the dm block device, which the same attacker can grant when creating the device.\nUI:N - No victim interaction is required once the attacker has the needed privileges and device access; the race can be driven entirely by attacker-controlled ioctl threads during dm-crypt zoned table setup.\nS:U - The use-after-free corrupts kernel heap metadata and zone-write-plug structures within kernel memory; it does not cross a VM, container, or IOMMU security boundary to affect a separate authority.\nC:H - The bug revives the CVE-2025-38141 class use-after-free where disk_free_zone_resources() can free zone_wplugs_hash/zones_cond while dm_blk_report_zones() still reads them through the live table path, enabling disclosure of freed kernel heap contents.\nI:H - Use-after-free on zone write plug and zone-condition structures provides attacker-influencable heap corruption primitives that can be developed into arbitrary kernel memory writes or control-flow hijack, not merely a bounded modification.\nA:H - Concurrent access to freed zone resources during failed blk_revalidate_disk_zones() can cause kernel oops/panic from dereferencing freed zone_wplugs_hash, zones_cond, or related structures, even when full exploitation is not attempted." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm-zone.c" ], "versions": [ { "version": "f9c1bdf24615303d48a2d0fd629c88f3189563aa", "lessThan": "175ac0a6115400278d3900f5a04a58b17b3f6cd0", "status": "affected", "versionType": "git" }, { "version": "37f53a2c60d03743e0eacf7a0c01c279776fef4e", "lessThan": "7a3385e97af2b6f485fef11e82d8c29adee4be93", "status": "affected", "versionType": "git" }, { "version": "37f53a2c60d03743e0eacf7a0c01c279776fef4e", "lessThan": "d809a36692ee1394cac85ce6ba7cf8ea58da5812", "status": "affected", "versionType": "git" }, { "version": "37f53a2c60d03743e0eacf7a0c01c279776fef4e", "lessThan": "24c405fdbe215c45e57bba672cc42859038491ee", "status": "affected", "versionType": "git" }, { "version": "d19bc1b4dd5f322980b1f05f79b2ea4f0db10920", "status": "affected", "versionType": "git" }, { "version": "6.12.34", "lessThan": "6.12.75", "status": "affected", "versionType": "semver" }, { "version": "6.15.3", "lessThan": "6.16", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm-zone.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.12.34", "versionEndExcluding": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/175ac0a6115400278d3900f5a04a58b17b3f6cd0" }, { "url": "https://git.kernel.org/stable/c/7a3385e97af2b6f485fef11e82d8c29adee4be93" }, { "url": "https://git.kernel.org/stable/c/d809a36692ee1394cac85ce6ba7cf8ea58da5812" }, { "url": "https://git.kernel.org/stable/c/24c405fdbe215c45e57bba672cc42859038491ee" } ], "title": "dm: fix unlocked test for dm_suspended_md", "x_generator": { "engine": "bippy-1.2.0" } } } }