Review reviewCritical

CVE-2026-64216

Linux

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages() netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it is wanting to unlock and compares that to rreq->no_unlock_folio so that it doesn't unlock a folio being read for netfs_perform_write() or netfs_write_begin(). However, given that netfs_unlock_abandoned_read_pages() is called _after_ NETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to dereference is the one specified by ->no_unlock_folio as ownership immediately rev...

CVSS: 9.8
EPSS: -
CISA KEV: Not listed
Published: 2026.07.25

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= ee4cdf7ba857a894ad1650d6ab77669cbbfa329e < 6080fa3ecfbb4448a3b47368629534c09b6ec750, >= ee4cdf7ba857a894ad1650d6ab77669cbbfa329e < 3866d015f33aeedf81338dd99154703bef33faef, >= ee4cdf7ba857a894ad1650d6ab77669cbbfa329e < dbe556972100fabb8e5a1b3d2163831ff07b1e8e, >= 6.12
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: Not available