CVE-2023-0468: linux linux_kernel Use After Free

Modified

AliasesUBUNTU-CVE-2023-0468DEBIAN-CVE-2023-0468

Published 25-01-2023Last modified 01-04-2025

Vulnerability summary

CVE-2023-0468 is a medium (CVSS 4.7) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 20.5% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Routine

Not severe (CVSS 4.7, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

4.7/10

010

Medium · v3.1 (CVE.org)

EPSS score

0.28%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 9 · Related 8

LSN-0094-1 USN-5912-1 USN-5935-1 USN-5938-1 USN-5941-1 USN-5962-1+3 more

Timeline

25-01-2023
PublishedVulnerability first disclosed.
01-04-2025
Last modifiedVulnerability information updated.

Description

A use-after-free flaw was found in io_uring/poll.c in io_poll_check_events in the io_uring subcomponent in the Linux Kernel due to a race condition of poll_refs. This flaw may cause a NULL pointer dereference.

CVSS metrics

4 scores · 4 sources · 1 version

v3.14.7

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found

referenceUnverified
Exploit Reference (bugzilla.redhat.com)
Maturity: unknown

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu70 products

linux< 5.15.0-67.74
linux-aws< 5.15.0-1031.35
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)
linux-aws-5.13All versions (No fix recorded)

linux-aws-5.15< 5.15.0-1031.35~20.04.1
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.8All versions (No fix recorded)
linux-azureAll versions (No fix recorded) | < 5.15.0-1034.41
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1034.41~20.04.1
linux-azure-5.19< 5.19.0-1023.24~22.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde< 5.15.0-1034.41.1
linux-azure-fde-5.15< 5.15.0-1034.41~20.04.1.2
linux-bluefield< 5.15.0-1014.16
linux-gcpAll versions (No fix recorded) | < 5.15.0-1030.37
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1030.37~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.8All versions (No fix recorded)
linux-gke< 5.15.0-1028.33
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15< 5.15.0-1028.33~20.04.1
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.15.0-1016.21
linux-gkeop-5.15< 5.15.0-1016.21~20.04.1
linux-gkeop-5.4All versions (No fix recorded)
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-67.74~20.04.1
linux-hwe-5.19< 5.19.0-40.41~22.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.15.0-1026.29
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtime< 5.15.0-1022.27
linux-intel-iotg< 5.15.0-1026.31
linux-intel-iotg-5.15< 5.15.0-1026.31~20.04.1
linux-kvm< 5.15.0-1029.34
linux-lowlatency< 5.15.0-67.74
linux-lowlatency-hwe-5.15< 5.15.0-67.74~20.04.1
linux-lowlatency-hwe-5.19< 5.19.0-1022.23~22.04.1
linux-nvidia< 5.15.0-1023.23
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.17< 5.17.0-1031.32
linux-oem-5.6All versions (No fix recorded)
linux-oem-6.0< 6.0.0-1015.15
linux-oracle< 5.15.0-1030.36
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15< 5.15.0-1030.36~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.15.0-1025.27
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1033.36
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1030.34~20.04.1
linux-riscv-5.8All versions (No fix recorded)

Show all 70

Debian1 product

linux< 6.0.12-1

Linux1 product

linux_kernel< 6.1 | 6.1 | 6.1:rc1 | 6.1:rc2 | 6.1:rc3 | 6.1:rc4 | 6.1:rc5 | 6.1:rc6

3 vendors · 72 products

References

15 links

bugzilla.redhat.com/show_bug.cgi?id=2164024ExploitIssue TrackingPatchThird Party Advisory
ubuntu.com/security/CVE-2023-0468REPORT
git.kernel.org/linus/12ad3d2d6c5b0131a6052de91360849e3e154846REPORT
git.kernel.org/linus/a26a35e9019fd70bf3cf647dcfdae87abc7baceaREPORT
ubuntu.com/security/notices/USN-5912-1Advisory
ubuntu.com/security/notices/USN-5935-1Advisory
ubuntu.com/security/notices/USN-5938-1Advisory
ubuntu.com/security/notices/USN-5941-1Advisory
ubuntu.com/security/notices/USN-5962-1Advisory
ubuntu.com/security/notices/USN-6024-1Advisory

Show all 15 references

ubuntu.com/security/notices/USN-6071-1Advisory
ubuntu.com/security/notices/USN-6072-1Advisory
www.cve.org/CVERecord?id=CVE-2023-0468REPORT
security-tracker.debian.org/tracker/CVE-2023-0468Advisory
nvd.nist.gov/vuln/detail/CVE-2023-0468OvalAdvisory