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NVD / CVE Program· CNA Linux

CVE-2023-53815: posix-timers: Prevent RT livelock in itimer_delete()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 0670c4c567b27bd8f999a943028f4fe60d1a1106, 9d9e522010eb5685d8b53e8a24320653d9d4cbbf, c1968bb8a28625cc95d2ad3ca872ab98c9c36d59.

Low priority for now. Upgrade to Linux Linux 0670c4c567b27bd8f999a943028f4fe60d1a1106, 9d9e522010eb5685d8b53e8a24320653d9d4cbbf, c1968bb8a28625cc95d2ad3ca872ab98c9c36d59 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: posix-timers: Prevent RT livelock in itimer_delete() itimer_delete() has a retry loop when the timer is concurrently expired. On non-RT kernels this just spin-waits until the timer callback has completed, except for posix CPU timers which have HAVE_POSIX_CPU_TIMERS_TASK_WORK enabled. In that case and on RT kernels the existing task could live lock when preempting the task which does the timer delivery. Replace spin_unlock() with an invocation of timer_wait_running() to handle it the same way as the other retry loops in the posix timer code.

—No exploit Fix available
Published
Dec 8, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.4affected
    • ec8f954a40da8cd3d159713b608e901f0cd909a9 and later · before f1be1ed32daa053484222f7f9beb2b16c624dffdaffected · git
    • ec8f954a40da8cd3d159713b608e901f0cd909a9 and later · before 0670c4c567b27bd8f999a943028f4fe60d1a1106affected · git
    • ec8f954a40da8cd3d159713b608e901f0cd909a9 and later · before e7aff15ba29ba4b3052786b1636fa5c4aa39e179affected · git
    • ec8f954a40da8cd3d159713b608e901f0cd909a9 and later · before f9bd298e3e4d3fd6e19f017789a42d0f332cd555affected · git
    • ec8f954a40da8cd3d159713b608e901f0cd909a9 and later · before c1968bb8a28625cc95d2ad3ca872ab98c9c36d59affected · git
    • ec8f954a40da8cd3d159713b608e901f0cd909a9 and later · before 9d9e522010eb5685d8b53e8a24320653d9d4cbbfaffected · git
    • before 5.4not affected · semver
    • 5.10.188 and later · up to and including 5.10.*not affected · semver
    • 5.15.121 and later · up to and including 5.15.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.4-16.4.4-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-53813Dec 8, 2025 · ext4: fix rbtree traversal bug in ext4_mb_use_preallocated
    0Monitor
  • ← EarlierCVE-2023-53814Dec 8, 2025 · PCI: Fix dropping valid root bus resources with .end = zero
    0Monitor
  • Later →CVE-2023-53817Dec 8, 2025 · crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui()
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0670c4c567b27bd8f999a943028f4fe60d1a1106Vendor (CNA)
Linux Linux9d9e522010eb5685d8b53e8a24320653d9d4cbbfVendor (CNA)
Linux Linuxc1968bb8a28625cc95d2ad3ca872ab98c9c36d59Vendor (CNA)
Linux Linuxe7aff15ba29ba4b3052786b1636fa5c4aa39e179Vendor (CNA)
Linux Linuxf1be1ed32daa053484222f7f9beb2b16c624dffdVendor (CNA)
Linux Linuxf9bd298e3e4d3fd6e19f017789a42d0f332cd555Vendor (CNA)
debian:linux6.1.52-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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