7.8

CVE-2023-1386: Qemu: 9pfs: suid/sgid bits not dropped on file write

Modified
AliasesUBUNTU-CVE-2023-1386DEBIAN-CVE-2023-1386CGA-45qq-6qxf-9w4m
Published 24-07-2023Last modified 25-09-2024

Vulnerability summary

CVE-2023-1386 is a high (CVSS 7.8) Improper Preservation of Permissions vulnerability in fedoraproject fedora. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.3, 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 (NVD)
EPSS score
0.24%
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

Timeline

  1. 24-07-2023
    PublishedVulnerability first disclosed.
  2. 25-09-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU. When a local user in the guest writes an executable file with SUID or SGID, none of these privileged bits are correctly dropped. As a result, in rare circumstances, this flaw could be used by malicious users in the guest to elevate their privileges within the guest and help a host local user to elevate privileges on the host.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% 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.

Chainguard14 products
  • qemuAll versions (No fix recorded)
  • qemu-block-iscsiAll versions (No fix recorded)
  • qemu-block-rbdAll versions (No fix recorded)
  • qemu-edk2-aarch64All versions (No fix recorded)
  • qemu-edk2-x86_64All versions (No fix recorded)
Wolfi14 products
  • qemuAll versions (No fix recorded)
  • qemu-block-iscsiAll versions (No fix recorded)
  • qemu-block-rbdAll versions (No fix recorded)
  • qemu-edk2-aarch64All versions (No fix recorded)
  • qemu-edk2-x86_64All versions (No fix recorded)
Ubuntu2 products
  • qemuAll versions (No fix recorded)
  • qemu-hweAll versions (No fix recorded)
Debian1 product
  • qemuAll versions (No fix recorded)
Fedoraproject1 product

5 vendors · 32 products

References

8 links