Use after free in Linux Kernel
Priority LOW 22CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. However, a running routine may be unaware of this and cause the use-after-free of the mdev->addrs object, potentially leading to a denial of service.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00336 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- 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 |
|---|---|---|---|---|---|
| — | Linux Kernel (mctp) | Fixed in kernel 5.18-rc5 | — | No fix listed | CNA |
- Linux Kernel (mctp) Vendor— Affected Fixed in kernel 5.18-rc5 Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.15 – 5.17 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:* | 5.18 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.18:rc2:*:*:*:*:*:* | 5.18 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.18:rc3:*:*:*:*:*:* | 5.18 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:* | 5.18 rc4 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.15 – 5.17 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:* Versions 5.18 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.18:rc2:*:*:*:*:*:* Versions 5.18 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.18:rc3:*:*:*:*:*:* Versions 5.18 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:* Versions 5.18 rc4 Vulnerable ·Linux
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2023-3439
- 2026-10-03 Alias added: GHSA-wh7q-2hgq-2xj7
References
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2023-3439 · CVE Program
- CVE-2023-3439 · NVD
- FIRST EPSS
- GHSA-wh7q-2hgq-2xj7 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-3439 · 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