7.1

CVE-2023-1838: linux linux_kernel Use After Free

Modified
AliasesUBUNTU-CVE-2023-1838DEBIAN-CVE-2023-1838
Published 05-04-2023Last modified 08-10-2026

Vulnerability summary

CVE-2023-1838 is a high (CVSS 7.1) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.1, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.1/10
010
High · v3.1 (NVD)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 15 · Related 10
RHSA-2023:6583RHSA-2024:0412RHSA-2024:0575RHSA-2024:0881RHSA-2024:0897SUSE-SU-2023:1895-1

Timeline

  1. 05-04-2023
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

Description

A use-after-free flaw was found in vhost_net_set_backend in drivers/vhost/net.c in virtio network subcomponent in the Linux kernel due to a double fget. This flaw could allow a local attacker to crash the system, and could even lead to a kernel information leak problem.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.25% 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

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

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

Ubuntu79 products
  • linux< 4.15.0-224.236 | < 5.4.0-126.142 | < 5.15.0-47.51
  • linux-aws< 4.15.0-1167.180 | < 5.4.0-1085.92 | < 5.15.0-1019.23
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
Netapp5 products
Debian1 product
  • linux< 5.17.11-1
Linux1 product
  • linux_kernel≥ 4.13, < 4.14.317 | ≥ 4.15, < 4.19.245 | ≥ 4.20, < 5.4.196 | ≥ 5.5, < 5.10.118 | ≥ 5.11, < 5.15.42 | ≥ 5.16, < 5.17.10

4 vendors · 86 products

References

9 links