CVE-2026-90303 (GCVE-0-2026-90303)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-10-19 09:01
VLAI
Title
ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < ab14f07952adfe735d86a53518f8cd576dfd5892 (git)
Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < 07e4d5380f2a844ab7a1b440dde350caf561cbb0 (git)
Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < 2a14d7797a49a47bccd1a9327fd69da838dcb0dd (git)
Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < 63e3c958a602d0896a101a897c2361878c266ca7 (git)
Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < 59bbf86d0ff9373bfa033ca123c1e924f09f1eba (git)
Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < c71f9a56520b419e55d173052629f2324deb5549 (git)
Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < 720408d98d9fb3c91a12090436734c8c61f04545 (git)
Affected: 6d021b724481fbb908eb29384898deb9f00dfe70 , < 1039bffd6ae9c75b42b7d148d6c1106134107b66 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.0
Unaffected: 0 , < 4.0 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "cve": "CVE-2026-90303",
      "id": "CVE-2026-90303",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "250",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90303.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:38:54Z",
      "cve": "CVE-2026-90303",
      "id": "CVE-2026-90303",
      "initial_release_date": "2026-09-18T00:18:29Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "348",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90303",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90303.json",
      "version": "6"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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