socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on…
Priority MEDIUM 62CWE-732Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.
Summary
socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0054 45th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| 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 |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-24626
- 2026-10-03 Alias added: GHSA-wr4w-95gx-6cfr
References
More GNU Screen vulnerabilities
- TI-2021-08542 encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of… CVSS 3.1CRITICAL 9.8
- TI-2003-00878 Integer signedness error in ansi.c for GNU screen 4.0.1 and earlier, and 3.9.15 and… CVSS 2.0HIGH 10.0
- TI-2020-07488 A buffer overflow was found in the way GNU Screen before 4.8.0 treated the special escape… CVSS 3.1CRITICAL 9.8
- TI-2017-03620 GNU screen before 4.5.1 allows local users to modify arbitrary files and consequently… CVSS 3.0HIGH 7.8
- TI-2007-02947 GNU screen 4.0.3 allows local users to unlock the screen via a CTRL-C sequence at the… CVSS 2.0HIGH 7.2
- TI-2002-01524 Buffer overflow in the Braille module for GNU screen 3.9.11, when HAVE_BRAILLE is… CVSS 2.0MEDIUM 4.6
Sources
- CVE-2023-24626 · CVE Program
- CVE-2023-24626 · NVD
- FIRST EPSS
- GHSA-wr4w-95gx-6cfr · GitHub Advisory Database · CC BY 4.0
- CVE-2023-24626 · Red Hat security data · CC BY 4.0
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