CVE-2026-46093

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46093", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.097Z", "datePublished": "2026-05-27T12:58:43.458Z", "dateUpdated": "2026-08-05T12:29:35.424Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:35.424Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vmalloc: take vmap_purge_lock in shrinker\n\ndecay_va_pool_node() can be invoked concurrently from two paths:\n__purge_vmap_area_lazy() when pools are being purged, and the shrinker via\nvmap_node_shrink_scan().\n\nHowever, decay_va_pool_node() is not safe to run concurrently, and the\nshrinker path currently lacks serialization, leading to races and possible\nleaks.\n\nProtect decay_va_pool_node() by taking vmap_purge_lock in the shrinker\npath to ensure serialization with purge users."}], "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 race is in core MM internals (vmap pool decay) reached only via local memory-management activity \u2014 inducing vmalloc/vfree churn (purge path) and memory pressure (shrinker path). No network-delivered data reaches the vulnerable function.\nAC:L - An unprivileged attacker controls both sides: one thread forces direct reclaim (shrinker\u2192decay) while another drives vmalloc/vfree churn past the lazy-free threshold (purge\u2192decay), and both can loop indefinitely to repeatedly attempt and win the narrow race.\nPR:L - Any unprivileged local process can allocate/free memory and induce reclaim; no capabilities or root are required to drive either racing path.\nUI:N - The race is triggered entirely by the attacker's own memory activity; no victim action is needed.\nS:U - The corruption stays within the kernel's own memory-management structures and does not cross into another security authority (no VM/IOMMU boundary escape).\nC:H - The data race corrupts the vmap pool linked list and free-area tree metadata; per kernel guidance, allocator memory corruption can be leveraged to read freed/adjacent kernel memory.\nI:H - Concurrent unserialized list_replace_init plus double-merge of vmap_area objects into the global free tree corrupts kernel free-list/tree state, a write/corruption primitive over allocator metadata.\nA:H - Corrupted lists and inconsistent len accounting (and the documented leaks) cause kernel crashes/oops and resource exhaustion when the corrupted pool is subsequently traversed or reused."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/vmalloc.c"], "versions": [{"version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "lessThan": "c15ff206ba78820bf2873d0c668a882e99f4b631", "status": "affected", "versionType": "git"}, {"version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "lessThan": "687ccdf582169cd680aeaf24cc953807c4cd4345", "status": "affected", "versionType": "git"}, {"version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "lessThan": "12f2341b4c235d5593a433abac201c1c6725787f", "status": "affected", "versionType": "git"}, {"version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "lessThan": "ec05f51f1e65bce95528543eb73fda56fd201d94", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/vmalloc.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.9", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.0.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c15ff206ba78820bf2873d0c668a882e99f4b631"}, {"url": "https://git.kernel.org/stable/c/687ccdf582169cd680aeaf24cc953807c4cd4345"}, {"url": "https://git.kernel.org/stable/c/12f2341b4c235d5593a433abac201c1c6725787f"}, {"url": "https://git.kernel.org/stable/c/ec05f51f1e65bce95528543eb73fda56fd201d94"}], "title": "mm/vmalloc: take vmap_purge_lock in shrinker", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/vmalloc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c15ff206ba78820bf2873d0c668a882e99f4b631", "status": "affected", "version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "versionType": "git"}, {"lessThan": "687ccdf582169cd680aeaf24cc953807c4cd4345", "status": "affected", "version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "versionType": "git"}, {"lessThan": "12f2341b4c235d5593a433abac201c1c6725787f", "status": "affected", "version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "versionType": "git"}, {"lessThan": "ec05f51f1e65bce95528543eb73fda56fd201d94", "status": "affected", "version": "7679ba6b36dbb300b757b672d6a32a606499e14b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/vmalloc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.96", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.27", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "474906DE-0215-49E1-B77B-B91C11FE152E", "versionEndExcluding": "6.18.27", "versionStartIncluding": "6.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vmalloc: take vmap_purge_lock in shrinker\n\ndecay_va_pool_node() can be invoked concurrently from two paths:\n__purge_vmap_area_lazy() when pools are being purged, and the shrinker via\nvmap_node_shrink_scan().\n\nHowever, decay_va_pool_node() is not safe to run concurrently, and the\nshrinker path currently lacks serialization, leading to races and possible\nleaks.\n\nProtect decay_va_pool_node() by taking vmap_purge_lock in the shrinker\npath to ensure serialization with purge users."}], "id": "CVE-2026-46093", "lastModified": "2026-07-18T16:17:13.530", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-27T14:17:30.860", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/12f2341b4c235d5593a433abac201c1c6725787f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/687ccdf582169cd680aeaf24cc953807c4cd4345"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c15ff206ba78820bf2873d0c668a882e99f4b631"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec05f51f1e65bce95528543eb73fda56fd201d94"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/vmalloc: take vmap_purge_lock in shrinker", "id": "2481938", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481938"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-414", "details": ["A flaw was found in the Linux kernel's memory management (vmalloc subsystem). The `decay_va_pool_node()` function, when invoked concurrently from the shrinker path, lacks proper serialization. This oversight can lead to race conditions, potentially resulting in memory leaks and affecting system stability."], "name": "CVE-2026-46093", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46093\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46093\nhttps://lore.kernel.org/linux-cve-announce/2026052703-CVE-2026-46093-30ab@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7679ba6b36dbb300b757b672d6a32a606499e14b,687ccdf582169cd680aeaf24cc953807c4cd4345)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7679ba6b36dbb300b757b672d6a32a606499e14b,12f2341b4c235d5593a433abac201c1c6725787f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7679ba6b36dbb300b757b672d6a32a606499e14b,ec05f51f1e65bce95528543eb73fda56fd201d94)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.27,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.4,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-27T21:30:34.718913+00:00", "updated": "2026-08-12T03:30:04.360846+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}