CVE-2026-46093 (GCVE-0-2026-46093)
Vulnerability from cvelistv5
Published
2026-05-27 12:58
Modified
2026-08-05 12:29
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: take vmap_purge_lock in shrinker decay_va_pool_node() can be invoked concurrently from two paths: __purge_vmap_area_lazy() when pools are being purged, and the shrinker via vmap_node_shrink_scan(). However, decay_va_pool_node() is not safe to run concurrently, and the shrinker path currently lacks serialization, leading to races and possible leaks. Protect decay_va_pool_node() by taking vmap_purge_lock in the shrinker path to ensure serialization with purge users.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7679ba6b36dbb300b757b672d6a32a606499e14b
Version: 7679ba6b36dbb300b757b672d6a32a606499e14b
Version: 7679ba6b36dbb300b757b672d6a32a606499e14b
Version: 7679ba6b36dbb300b757b672d6a32a606499e14b
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/vmalloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "c15ff206ba78820bf2873d0c668a882e99f4b631",
              "status": "affected",
              "version": "7679ba6b36dbb300b757b672d6a32a606499e14b",
              "versionType": "git"
            },
            {
              "lessThan": "687ccdf582169cd680aeaf24cc953807c4cd4345",
              "status": "affected",
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            },
            {
              "lessThan": "12f2341b4c235d5593a433abac201c1c6725787f",
              "status": "affected",
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              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.27",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\u0027s own memory activity; no victim action is needed.\nS:U - The corruption stays within the kernel\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:29:35.424Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46093",
    "datePublished": "2026-05-27T12:58:43.458Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
    "dateUpdated": "2026-08-05T12:29:35.424Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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