arm64: mm: Fix the lockless page-table walk in show_pte()
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.
CVE-2026-93239
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93239
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1d18c47c735e8adfe531fc41fae31e98f86b68fe",
"lessThan": "08d931a0a850ad16a64f2cd23a19f40795cdbdf7",
"versionType": "git"
},
{
"status": "affected",
"version": "1d18c47c735e8adfe531fc41fae31e98f86b68fe",
"lessThan": "b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1",
"versionType": "git"
},
{
"status": "affected",
"version": "1d18c47c735e8adfe531fc41fae31e98f86b68fe",
"lessThan": "68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3",
"versionType": "git"
},
{
"status": "affected",
"version": "1d18c47c735e8adfe531fc41fae31e98f86b68fe",
"lessThan": "0f05d95b99164a9ccc4cf4a4920e0ff0228138ad",
"versionType": "git"
},
{
"status": "affected",
"version": "1d18c47c735e8adfe531fc41fae31e98f86b68fe",
"lessThan": "a77644d009dece1104b6fcc6e322b0e4503db0d6",
"versionType": "git"
}
],
"programFiles": [
"arch/arm64/mm/fault.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/arm64/mm/fault.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93239
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37937 · Revision 1
- Added to Heist Feed
- Publisher date