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CVE-2026-93239

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

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 22:05:33 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

8 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before b8f06b73ad146d84a33c124563c93eeef4f5b674

git versions

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before b3535b6cb2c48f97b8c3378eb9ea12538425bf14

git versions

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before e1b06278a7e241da0cd3187871e67255f956d184

git versions

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before 08d931a0a850ad16a64f2cd23a19f40795cdbdf7

git versions

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1

git versions

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before 68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3

git versions

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before 0f05d95b99164a9ccc4cf4a4920e0ff0228138ad

git versions

1d18c47c735e8adfe531fc41fae31e98f86b68fe → before a77644d009dece1104b6fcc6e322b0e4503db0d6

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

10 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

3.7

unaffected

0 → before 3.7

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.157 → through 6.6.*

semver versions

6.12.110 → through 6.12.*

semver versions

6.18.51 → through 6.18.*

semver versions

7.2.5 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

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.

Linux guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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.

References

8 sources
git.kernel.org/stable/c/b8f06b73ad146d84a33c124563c93eeef4f5b674
Source referenceLinux
git.kernel.org/stable/c/b3535b6cb2c48f97b8c3378eb9ea12538425bf14
Source referenceLinux
git.kernel.org/stable/c/e1b06278a7e241da0cd3187871e67255f956d184
Source referenceLinux
git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7
Source referenceLinux
git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1
Source referenceLinux
git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad
Source referenceLinux
git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-93239

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 6.6.157

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 6.12.110

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 6.18.51

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 7.2.5

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.7

Before: 7.3

Applicability preview
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    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "3.7",
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          {
            "vulnerable": true,
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          {
            "vulnerable": true,
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            "versionStartIncluding": "3.7",
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          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          {
            "vulnerable": true,
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  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.