CVE-2026-53288 (GCVE-0-2026-53288)

Vulnerability from cvelistv5 – Published: 2026-06-26 19:40 – Updated: 2026-06-26 19:40
VLAI
Title
arm64: Reserve an extra page for early kernel mapping
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: Reserve an extra page for early kernel mapping The final part of [data, end) segment may overflow into the next page of init_pg_end[1] which is the gap page before early_init_stack[2]: [1] crash_arm64_v9.0.1> vtop ffffffed00601000 VIRTUAL PHYSICAL ffffffed00601000 83401000 PAGE DIRECTORY: ffffffecffd62000 PGD: ffffffecffd62da0 => 10000000833fb003 PMD: ffffff80033fb018 => 10000000833fe003 PTE: ffffff80033fe008 => 68000083401f03 PAGE: 83401000 PTE PHYSICAL FLAGS 68000083401f03 83401000 (VALID|SHARED|AF|NG|PXN|UXN) PAGE PHYSICAL MAPPING INDEX CNT FLAGS fffffffec00d0040 83401000 0 0 1 4000 reserved [2] ffffffed002c8000 (r) __pi__data ffffffed0054e000 (d) __pi___bss_start ffffffed005f5000 (b) __pi_init_pg_dir ffffffed005fe000 (b) __pi_init_pg_end ffffffed005ff000 (B) early_init_stack ffffffed00608000 (b) __pi__end For 4K pages, the early kernel mapping may use 2MB block entries but the kernel segments are only 64KB aligned. Segment boundaries that fall within a 2MB block therefore require a PTE table so that different attributes can be applied on either side of the boundary. KERNEL_SEGMENT_COUNT still correctly counts the five permanent kernel VMAs registered by declare_kernel_vmas(). However, since commit 5973a62efa34 ("arm64: map [_text, _stext) virtual address range non-executable+read-only"), the early mapper also maps [_text, _stext) separately from [_stext, _etext). This adds one more early-only split and can require one more page-table page than the existing EARLY_SEGMENT_EXTRA_PAGES allowance reserves. Increase the 4K-page early mapping allowance by one page to cover that additional split. [catalin.marinas@arm.com: rewrote part of the commit log] [catalin.marinas@arm.com: expanded the code comment]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fdd380a5950503a07aaaf74536a0c2f223475eb0 , < a4ff33053da0a34b14abb5c96dc5a48379e26fce (git)
Affected: 5973a62efa34c80c9a4e5eac1fca6f6209b902af , < dcb89deed40ba55ff7020061712fdabf098cc2cc (git)
Affected: 5973a62efa34c80c9a4e5eac1fca6f6209b902af , < 9fe9e3acaa14921b0cf0d6cc2de5b562499bf721 (git)
Affected: 5973a62efa34c80c9a4e5eac1fca6f6209b902af , < 4d8e74ad4585672489da6145b3328d415f50db82 (git)
Affected: 88025faf2aa08c7468d68d8cb31a53b55aae6ee0 (git)
Affected: 6.12.54 , < 6.12.91 (semver)
Affected: 6.17.4 , < 6.18 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "current_release_date": "2026-06-29T09:58:43+00:00",
      "cve": "CVE-2026-53288",
      "id": "CVE-2026-53288",
      "initial_release_date": "2026-06-26T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: arm64: Reserve an extra page for early kernel mapping",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53288.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-07-01T03:16:27Z",
      "cve": "CVE-2026-53288",
      "id": "CVE-2026-53288",
      "initial_release_date": "2026-06-28T01:09:18Z",
      "product_status:known_not_affected": "291",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53288",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53288.json",
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}



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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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