CVE-2026-46035 (GCVE-0-2026-46035)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-05-27 12:56
VLAI
Title
mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP On UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that unconditionally succeeds even when the lock is already held. As a result, alloc_frozen_pages_nolock() called from NMI context can re-enter rmqueue() and acquire the zone lock that the interrupted context is already holding, corrupting the freelists. With CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with the slub_kunit test module: BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243 [...] Call Trace: <NMI> dump_stack_lvl+0x3f/0x60 do_raw_spin_trylock+0x41/0x50 _raw_spin_trylock+0x24/0x50 rmqueue.isra.0+0x2a9/0xa70 get_page_from_freelist+0xeb/0x450 alloc_frozen_pages_nolock_noprof+0x111/0x1e0 allocate_slab+0x42a/0x500 ___slab_alloc+0xa7/0x4c0 kmalloc_nolock_noprof+0x164/0x310 [...] </NMI> Fix this by returning NULL early when invoked from NMI on a UP kernel.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d7242af8643409aae32243450341ef25b28d8a8c , < 05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4 (git)
Affected: d7242af8643409aae32243450341ef25b28d8a8c , < a6d57efeaae3f3b3656514f600eac96be713d90e (git)
Affected: d7242af8643409aae32243450341ef25b28d8a8c , < 620b46ed6ae17c8438d889c8c0cfddab36a1476c (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/page_alloc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.1-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.27",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc2",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP\n\nOn UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that\nunconditionally succeeds even when the lock is already held. As a\nresult, alloc_frozen_pages_nolock() called from NMI context can\nre-enter rmqueue() and acquire the zone lock that the interrupted\ncontext is already holding, corrupting the freelists.\n\nWith CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with\nthe slub_kunit test module:\n\n  BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243\n  [...]\n  Call Trace:\n   \u003cNMI\u003e\n   dump_stack_lvl+0x3f/0x60\n   do_raw_spin_trylock+0x41/0x50\n   _raw_spin_trylock+0x24/0x50\n   rmqueue.isra.0+0x2a9/0xa70\n   get_page_from_freelist+0xeb/0x450\n   alloc_frozen_pages_nolock_noprof+0x111/0x1e0\n   allocate_slab+0x42a/0x500\n   ___slab_alloc+0xa7/0x4c0\n   kmalloc_nolock_noprof+0x164/0x310\n   [...]\n   \u003c/NMI\u003e\n\nFix this by returning NULL early when invoked from NMI on a UP kernel."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:56:44.260Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6d57efeaae3f3b3656514f600eac96be713d90e"
        },
        {
          "url": "https://git.kernel.org/stable/c/620b46ed6ae17c8438d889c8c0cfddab36a1476c"
        }
      ],
      "title": "mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46035",
    "datePublished": "2026-05-27T12:56:44.260Z",
    "dateReserved": "2026-05-13T15:03:33.093Z",
    "dateUpdated": "2026-05-27T12:56:44.260Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46035",
      "date": "2026-05-28",
      "epss": "0.00017",
      "percentile": "0.04322"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46035\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:17:22.617\",\"lastModified\":\"2026-05-27T14:48:03.013\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP\\n\\nOn UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that\\nunconditionally succeeds even when the lock is already held. As a\\nresult, alloc_frozen_pages_nolock() called from NMI context can\\nre-enter rmqueue() and acquire the zone lock that the interrupted\\ncontext is already holding, corrupting the freelists.\\n\\nWith CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with\\nthe slub_kunit test module:\\n\\n  BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243\\n  [...]\\n  Call Trace:\\n   \u003cNMI\u003e\\n   dump_stack_lvl+0x3f/0x60\\n   do_raw_spin_trylock+0x41/0x50\\n   _raw_spin_trylock+0x24/0x50\\n   rmqueue.isra.0+0x2a9/0xa70\\n   get_page_from_freelist+0xeb/0x450\\n   alloc_frozen_pages_nolock_noprof+0x111/0x1e0\\n   allocate_slab+0x42a/0x500\\n   ___slab_alloc+0xa7/0x4c0\\n   kmalloc_nolock_noprof+0x164/0x310\\n   [...]\\n   \u003c/NMI\u003e\\n\\nFix this by returning NULL early when invoked from NMI on a UP kernel.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/620b46ed6ae17c8438d889c8c0cfddab36a1476c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6d57efeaae3f3b3656514f600eac96be713d90e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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