7.8

CVE-2023-40283: canonical ubuntu_linux Use After Free

Modified
AliasesUBUNTU-CVE-2023-40283DEBIAN-CVE-2023-40283
Published 14-08-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-40283 is a high (CVSS 7.8) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 46% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.55%
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 45 · Related 26
DLA-3623-1DLA-3710-1DSA-5480-1DSA-5492-1LSN-0098-1LSN-0099-1

Timeline

  1. 14-08-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in l2cap_sock_release in net/bluetooth/l2cap_sock.c in the Linux kernel before 6.4.10. There is a use-after-free because the children of an sk are mishandled.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.55% 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.

Ubuntu104 products
  • linuxAll versions (No fix recorded) | < 4.4.0-245.279 | < 4.15.0-218.229 | < 5.4.0-163.180 | < 5.15.0-84.93
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1123.129 | < 4.4.0-1161.176 | < 4.15.0-1161.174 | < 5.4.0-1110.119 | < 5.15.0-1045.50
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.52-1 | < 6.4.11-1
  • debian_linuxEOL10.0 | 11.0 | 12.0
Canonical1 product
Linux1 product
  • linux_kernel≥ 3.5, < 4.14.322 | ≥ 4.15, < 4.19.291 | ≥ 4.20, < 5.4.253 | ≥ 5.5, < 5.10.190 | ≥ 5.11, < 5.15.126 | ≥ 5.16, < 6.1.45 | ≥ 6.2, < 6.4.10

4 vendors · 108 products

References

30 links
Show all 30 references