arm64: mm: Fix the lockless page-table walk in show_pte()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93239
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:19 UTC
Updated2026-09-24 16:17:19 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe 08d931a0a850ad16a64f2cd23a19f40795cdbdf7 git Not specified
CNA Linux Linux affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1 git Not specified
CNA Linux Linux affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe 68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3 git Not specified
CNA Linux Linux affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe 0f05d95b99164a9ccc4cf4a4920e0ff0228138ad git Not specified
CNA Linux Linux affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe a77644d009dece1104b6fcc6e322b0e4503db0d6 git Not specified
CNA Linux Linux affected 3.7 Not specified
CNA Linux Linux unaffected 3.7 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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