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CVE-2026-43285

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

mm/slab: do not access current->mems_allowed_seq if !allow_spin

Lockdep complains when get_from_any_partial() is called in an NMI context, because current->mems_allowed_seq is seqcount_spinlock_t and not NMI-safe:

According to Documentation/locking/seqlock.rst, seqcount_t is not NMI-safe and seqcount_latch_t should be used when read path can interrupt the write-side critical section. In this case, do not access current->mems_allowed_seq and avoid retry.

Detalles técnicos trazas, registros y código del informe original
  ================================
  WARNING: inconsistent lock state
  6.19.0-rc5-kfree-rcu+ #315 Tainted: G                 N
  --------------------------------
  inconsistent {INITIAL USE} -> {IN-NMI} usage.
  kunit_try_catch/9989 [HC1[1]:SC0[0]:HE0:SE1] takes:
  ffff889085799820 (&____s->seqcount#3){.-.-}-{0:0}, at: ___slab_alloc+0x58f/0xc00
  {INITIAL USE} state was registered at:
    lock_acquire+0x185/0x320
    kernel_init_freeable+0x391/0x1150
    kernel_init+0x1f/0x220
    ret_from_fork+0x736/0x8f0
    ret_from_fork_asm+0x1a/0x30
  irq event stamp: 56
  hardirqs last  enabled at (55): [<ffffffff850a68d7>] _raw_spin_unlock_irq+0x27/0x70
  hardirqs last disabled at (56): [<ffffffff850858ca>] __schedule+0x2a8a/0x6630
  softirqs last  enabled at (0): [<ffffffff81536711>] copy_process+0x1dc1/0x6a10
  softirqs last disabled at (0): [<0000000000000000>] 0x0

  other info that might help us debug this:
   Possible unsafe locking scenario:

         CPU0
         ----
    lock(&____s->seqcount#3);
    <Interrupt>
      lock(&____s->seqcount#3);

   *** DEADLOCK ***

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-43285",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "programFiles": [
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          "defaultStatus": "unaffected"
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              "version": "7.0",
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          "programFiles": [
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          "defaultStatus": "affected"
        }
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  "published": "2026-05-08T14:16:35.337",
  "references": [
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      "tags": [
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    },
    {
      "url": "https://git.kernel.org/stable/c/353dd9934447b9193643ae1afd938607a74d4915",
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slab: do not access current->mems_allowed_seq if !allow_spin\n\nLockdep complains when get_from_any_partial() is called in an NMI\ncontext, because current->mems_allowed_seq is seqcount_spinlock_t and\nnot NMI-safe:\n\n  ================================\n  WARNING: inconsistent lock state\n  6.19.0-rc5-kfree-rcu+ #315 Tainted: G                 N\n  --------------------------------\n  inconsistent {INITIAL USE} -> {IN-NMI} usage.\n  kunit_try_catch/9989 [HC1[1]:SC0[0]:HE0:SE1] takes:\n  ffff889085799820 (&____s->seqcount#3){.-.-}-{0:0}, at: ___slab_alloc+0x58f/0xc00\n  {INITIAL USE} state was registered at:\n    lock_acquire+0x185/0x320\n    kernel_init_freeable+0x391/0x1150\n    kernel_init+0x1f/0x220\n    ret_from_fork+0x736/0x8f0\n    ret_from_fork_asm+0x1a/0x30\n  irq event stamp: 56\n  hardirqs last  enabled at (55): [<ffffffff850a68d7>] _raw_spin_unlock_irq+0x27/0x70\n  hardirqs last disabled at (56): [<ffffffff850858ca>] __schedule+0x2a8a/0x6630\n  softirqs last  enabled at (0): [<ffffffff81536711>] copy_process+0x1dc1/0x6a10\n  softirqs last disabled at (0): [<0000000000000000>] 0x0\n\n  other info that might help us debug this:\n   Possible unsafe locking scenario:\n\n         CPU0\n         ----\n    lock(&____s->seqcount#3);\n    <Interrupt>\n      lock(&____s->seqcount#3);\n\n   *** DEADLOCK ***\n\nAccording to Documentation/locking/seqlock.rst, seqcount_t is not\nNMI-safe and seqcount_latch_t should be used when read path can interrupt\nthe write-side critical section. In this case, do not access\ncurrent->mems_allowed_seq and avoid retry."
    }
  ],
  "lastModified": "2026-06-17T10:49:18.703",
  "configurations": [
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      "nodes": [
        {
          "negate": false,
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}