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ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set, a user fault may trigger show_pte() without any lock. If another thread in the same process concurrently calls munmap(), the page table pages may be freed while show_pte() is still traversing them, causing a use-after-free in show_pte(). If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table of PMD are freed when show_pte() is running. Acquire mmap_write_lock() around show_pte() for user faults to fix the contention. For user faults, additionally restrict that show_pte() is called only when the addr is a user-space address (addr < TASK_SIZE). This is because the lock of tsk->mm only protects the virtual memory of user address space, furthermore, dumping the page tables of a kernel-space address for user faults is unnecessary and may have security implications. Keep everything unchanged for kernel faults, because the kernel is already in the "oops" state, acquiring a lock may risk a deadlock.

Announced Source revision 1
Original source ↗

CVE-2026-90303

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90303

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "ab14f07952adfe735d86a53518f8cd576dfd5892",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "07e4d5380f2a844ab7a1b440dde350caf561cbb0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "2a14d7797a49a47bccd1a9327fd69da838dcb0dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "63e3c958a602d0896a101a897c2361878c266ca7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "59bbf86d0ff9373bfa033ca123c1e924f09f1eba",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "c71f9a56520b419e55d173052629f2324deb5549",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "720408d98d9fb3c91a12090436734c8c61f04545",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
        "lessThan": "1039bffd6ae9c75b42b7d148d6c1106134107b66",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/arm/mm/fault.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/arm/mm/fault.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90303

Source reference: /cveMetadata/cveId

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Event
#36657 · Revision 1
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