Use after free in kernel
Priority LOW 38CWE-416Published · Updated
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
- Partial Red Hat: 4 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
A flaw was found in the Linux kernel’s futex implementation. This flaw allows a local attacker to corrupt system memory or escalate their privileges when creating a futex on a filesystem that is about to be unmounted. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0083 57th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 4 fixed, 2 without a fix
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 |
|---|---|---|---|---|---|
| — | kernel | Linux kernel 5.6-rc6 | — | No fix listed | CNA |
- kernel Vendor— Affected Linux kernel 5.6-rc6 Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 5.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.6:-:*:*:*:*:*:* | 5.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.6:rc1:*:*:*:*:*:* | 5.6 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.6:rc2:*:*:*:*:*:* | 5.6 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.6:rc3:*:*:*:*:*:* | 5.6 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.6:rc4:*:*:*:*:*:* | 5.6 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.6:rc5:*:*:*:*:*:* | 5.6 rc5 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.6:-:*:*:*:*:*:* Versions 5.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.6:rc1:*:*:*:*:*:* Versions 5.6 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.6:rc2:*:*:*:*:*:* Versions 5.6 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.6:rc3:*:*:*:*:*:* Versions 5.6 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.6:rc4:*:*:*:*:*:* Versions 5.6 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.6:rc5:*:*:*:*:*:* Versions 5.6 rc5 Vulnerable ·Linux
Remediation
Red Hat 2 advisories
- RHSA-2020:4609 Released 2020-11-04 · Red Hat rating Moderatekernel-rt security and bug fix update
- Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-240.rt7.54.el8, kernel-rt-core-4.18.0-240.rt7.54.el8, kernel-rt-debug-4.18.0-240.rt7.54.el8 +7
- Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-240.rt7.54.el8, kernel-rt-core-4.18.0-240.rt7.54.el8, kernel-rt-debug-4.18.0-240.rt7.54.el8 +9
- RHSA-2020:4431 Released 2020-11-04 · Red Hat rating Moderatekernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-240.el8
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-240.el8, kernel-4.18.0-240.el8, kernel-abi-whitelists-4.18.0-240.el8 +19
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise MRG 2 | Affected | No fix planned: Out of support scope |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2020:4431 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2020:4431 |
| Red Hat Enterprise Linux Real Time (v. 8) | Fixed | RHSA-2020:4609 |
| Red Hat Enterprise Linux Real Time for NFV (v. 8) | Fixed | RHSA-2020:4609 |
Not affected: 2 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2020-14381
- 2026-10-03 Alias added: GHSA-69w4-9w32-v3qh
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-2020-14381 · CVE Program
- CVE-2020-14381 · NVD
- FIRST EPSS
- GHSA-69w4-9w32-v3qh · GitHub Advisory Database · CC BY 4.0
- CVE-2020-14381 · Red Hat security data · CC BY 4.0
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