CVE-2026-93239arm64: mm: Fix the lockless page-table walk in show_pte()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: arm64: mm: Fix the lockless page-table walk in show_pte() show_pte() walks page tables locklessly and can run with interrupts enabled. A concurrent teardown can free a table page while it is being walked. It can also clear a parent entry after show_pte() checked it; the regular pXd_offset() helpers then reread the cleared entry and can derive a bogus lower-level pointer and fault again. Use the lockless offset helpers with the saved parent entries, as gup_fast() does, and pass the saved PMD to pte_offset_map(). For task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable local interrupts around the walk to hold off RCU-deferred table frees and block the tlb_remove_table_sync_one() IPI until the walk is finished. Place the IRQ guard after the header print. This does not make the output a consistent snapshot, but prevents the task page-table walk from dereferencing a released table page or deriving a pointer from a different parent value.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1d18c47c735e8adfe531fc41fae31e98f86b68fe before 08d931a0a850ad16a64f2cd23a19f40795cdbdf7; from 1d18c47c735e8adfe531fc41fae31e98f86b68fe before b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1; from 1d18c47c735e8adfe531fc41fae31e98f86b68fe before 68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3; 1d18c47c735e8adfe531fc41fae31e98f86b68fe builds before 0f05d95b99164a9ccc4cf4a4920e0ff0228138ad; from 1d18c47c735e8adfe531fc41fae31e98f86b68fe before a77644d009dece1104b6fcc6e322b0e4503db0d6 | CNA record |
References
- https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7
- https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1
- https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3
- https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad
- https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.