Use after free in D-Bus Development branch
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined behaviors
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | D-Bus Development branch | <= 1.13.16 (Fixed: >= 1.13.18) | — | No fix listed | CNA |
| — | dbus-1.12.x stable branch | <= 1.12.18 (Fixed: >= 1.12.20) | — | No fix listed | CNA |
| — | dbus-1.10.x and older branches (EOL) | <= 1.10.30 (Fixed: 1.10.32) | — | No fix listed | CNA |
- D-Bus Development branch Vendor— Affected <= 1.13.16 (Fixed: >= 1.13.18) Fixed in — No fix listed CNA
- dbus-1.12.x stable branch Vendor— Affected <= 1.12.18 (Fixed: >= 1.12.20) Fixed in — No fix listed CNA
- dbus-1.10.x and older branches (EOL) Vendor— Affected <= 1.10.30 (Fixed: 1.10.32) Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:freedesktop:dbus:1.12.20:*:*:*:*:*:*:* | 1.12.20 | Vulnerable | Freedesktop |
| cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Linux |
- cpe:2.3:a:freedesktop:dbus:1.12.20:*:*:*:*:*:*:* Versions 1.12.20 Vulnerable ·Freedesktop
- cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
Not affected: 1 product
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2020-35512
- 2026-10-03 Alias added: GHSA-f5qm-fxvw-fwjg
References
More Freedesktop Dbus vulnerabilities
- TI-2022-20347 An issue was discovered in D-Bus before 1.12.24, 1.13.x and 1.14.x before 1.14.4, and… CVSS 3.1MEDIUM 6.5
- TI-2019-09538 dbus before 1.10.28, 1.12.x before 1.12.16, and 1.13.x before 1.13.12, as used in… CVSS 3.1HIGH 7.1
- TI-2023-17459 D-Bus before 1.15.6 sometimes allows unprivileged users to crash dbus-daemon. CVSS 3.1MEDIUM 6.5
- TI-2022-20346 An issue was discovered in D-Bus before 1.12.24, 1.13.x and 1.14.x before 1.14.4, and… CVSS 3.1MEDIUM 6.5
- TI-2022-20345 An issue was discovered in D-Bus before 1.12.24, 1.13.x and 1.14.x before 1.14.4, and… CVSS 3.1MEDIUM 6.5
- TI-2020-09707 An issue was discovered in dbus >= 1.3.0 before 1.12.18. CVSS 3.1MEDIUM 5.5
Sources
- CVE-2020-35512 · CVE Program
- CVE-2020-35512 · NVD
- FIRST EPSS
- GHSA-f5qm-fxvw-fwjg · GitHub Advisory Database · CC BY 4.0
- CVE-2020-35512 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences