CVE-2026-53288 is a vulnerability in Linux Kernel
Published on June 26, 2026
arm64: Reserve an extra page for early kernel mapping
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]
Products Associated with CVE-2026-53288
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Affected Versions
Linux:- Version fdd380a5950503a07aaaf74536a0c2f223475eb0 and below a4ff33053da0a34b14abb5c96dc5a48379e26fce is affected.
- Version 5973a62efa34c80c9a4e5eac1fca6f6209b902af and below dcb89deed40ba55ff7020061712fdabf098cc2cc is affected.
- Version 5973a62efa34c80c9a4e5eac1fca6f6209b902af and below 9fe9e3acaa14921b0cf0d6cc2de5b562499bf721 is affected.
- Version 5973a62efa34c80c9a4e5eac1fca6f6209b902af and below 4d8e74ad4585672489da6145b3328d415f50db82 is affected.
- Version 88025faf2aa08c7468d68d8cb31a53b55aae6ee0 is affected.
- Version 6.12.54 and below 6.12.91 is affected.
- Version 6.17.4 and below 6.18 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.12.91, <= 6.12.* is unaffected.
- Version 6.18.33, <= 6.18.* is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.