GHSA-5WWM-GPR7-9RM3
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-93239"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T16:17:19Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Fix the lockless page-table walk in show_pte()\n\nshow_pte() walks page tables locklessly and can run with interrupts\nenabled. A concurrent teardown can free a table page while it is being\nwalked. It can also clear a parent entry after show_pte() checked it; the\nregular pXd_offset() helpers then reread the cleared entry and can derive a\nbogus lower-level pointer and fault again.\n\nUse the lockless offset helpers with the saved parent entries, as\ngup_fast() does, and pass the saved PMD to pte_offset_map().\n\nFor task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable\nlocal interrupts around the walk to hold off RCU-deferred table frees and\nblock the tlb_remove_table_sync_one() IPI until the walk is finished.\n\nPlace the IRQ guard after the header print. This does not make the output a\nconsistent snapshot, but prevents the task page-table walk from\ndereferencing a released table page or deriving a pointer from a different\nparent value.",
"id": "GHSA-5wwm-gpr7-9rm3",
"modified": "2026-09-24T18:31:23Z",
"published": "2026-09-24T18:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93239"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1"
}
],
"schema_version": "1.4.0",
"severity": []
}
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