CVE-2026-53264: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: use RCU with deferred

Q: How do I fix CVE-2026-53264?

linux kernel: upgrade to 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13. Exact commands for each OS are on this page.

Q: Is CVE-2026-53264 being exploited?

CVE-2026-53264 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-53264 affect?

CVE-2026-53264 affects linux kernel. Severity is high (CVSS 7.8). In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: use RCU with deferred freeing for action lifecycle When NEWTFILTER and DELFILTER are run concurrently it is possible to create a race with an associat

Q: How urgent is CVE-2026-53264?

Priority 43/100. High severity; On your watchlist

This month

HIGH 7.8WATCHLISTUPGRADE

CVE-2026-53264 is a high-severity flaw (CVSS 7.8) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: use RCU with deferred freeing for action lifecycle When NEWTFILTER and DELFILTER are run concurrently it is possible to create a race with an associated action. Let's illustrate with CPU0 running NEWTFILTER and CPU1 running DELFILTER: 0: mutex_lock() <-- holds the idr lock 0: rcu_read_lock() 0: p = idr_find(idr, index) <-- action p is valid (RCU protect

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-06-25
Last modified	2026-10-15

Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 09:16 UTCPublished CVE record published
2026-10-15 02:20 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 4.14 and < 5.10.259 · >= 5.11 and < 5.15.210 · >= 5.16 and < 6.1.176 · >= 6.2 and < 6.6.143 · >= 6.7 and < 6.12.94 · >= 6.13 and < 6.18.36 · >= 6.19 and < 7.0.13 · 7.1 rc1

Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53264?

linux kernel: upgrade to 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13. Exact commands for each OS are on this page.

Is CVE-2026-53264 being exploited?

CVE-2026-53264 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53264 affect?

CVE-2026-53264 affects linux kernel. Severity is high (CVSS 7.8). In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: use RCU with deferred freeing for action lifecycle When NEWTFILTER and DELFILTER are run concurrently it is possible to create a race with an associat

How urgent is CVE-2026-53264?

Priority 43/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities

Related CVEs

CVE-2026-63893 HIGH 8.1 UPGRADE In the Linux kernel, the following vulnerability has been resolved: thunderbolt: property: Reject u32 wrap in
CVE-2026-63888 CRITICAL 9.8 UPGRADE In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix CRC overread and
CVE-2026-63885 HIGH 8.8 UPGRADE In the Linux kernel, the following vulnerability has been resolved: drm/gem: fix race between change_handle a
CVE-2026-63884 HIGH 7.8 UPGRADE In the Linux kernel, the following vulnerability has been resolved: drm/i915: Fix potential UAF in TTM object
CVE-2026-63881 HIGH 7.8 UPGRADE In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix a vulnerability of intege

References

← Back to latest CVEs