Input: synaptics-rmi4 - fix use after free in rmi_unregister_function()
Priority LOW 34CWE-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: 16 fixed, 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: synaptics-rmi4 - fix use after free in rmi_unregister_function() The put_device() calls rmi_release_function() which frees "fn" so the dereference on the next line "fn->num_of_irqs" is a use after free. Move the put_device() to the end to fix this.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00242 15th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.19.299, 5.4.261, 5.10.201 +5Red Hat: 4 advisoriesRed Hat: 16 fixed, 2 without a fix
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 | Linux | 4.18 and later | 4.19.299, 5.4.261, 5.10.201, 5.15.139, 6.1.63, 6.5.12, 6.6.2, 6.7 | Patch available | CNA |
- Linux VendorLinux Affected 4.18 and later Fixed in 4.19.299, 5.4.261, 5.10.201, 5.15.139, 6.1.63, 6.5.12, 6.6.2, 6.7 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.18 to before 4.19.299; 4.20 to before 5.4.261; 5.5 to before 5.10.201; 5.11 to before 5.15.139; 5.16 to before 6.1.63; 6.2 to before 6.5.12; 6.6 to before 6.6.2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.18 to before 4.19.299; 4.20 to before 5.4.261; 5.5 to before 5.10.201; 5.11 to before 5.15.139; 5.16 to before 6.1.63; 6.2 to before 6.5.12; 6.6 to before 6.6.2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.19.299, 5.4.261, 5.10.201, 5.15.139, 6.1.63, 6.5.12, 6.6.2, 6.7
Red Hat 4 advisories
- RHSA-2025:8248 Released 2025-05-28 · Red Hat rating Importantkernel security update
- Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.70.1.el9_4, libperf-5.14.0-427.70.1.el9_4
- Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.70.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.70.1.el9_4, kernel-64k-devel-5.14.0-427.70.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.70.1.el9_4, kernel-5.14.0-427.70.1.el9_4, kernel-64k-5.14.0-427.70.1.el9_4 +29
- Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.70.1.el9_4, kernel-rt-core-5.14.0-427.70.1.el9_4, kernel-rt-debug-5.14.0-427.70.1.el9_4 +9
- Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.70.1.el9_4, kernel-rt-core-5.14.0-427.70.1.el9_4, kernel-rt-debug-5.14.0-427.70.1.el9_4 +11
- RHSA-2024:9315 Released 2024-11-12 · Red Hat rating Moderatekernel security update
- Red Hat CodeReady Linux Builder (v. 9) kernel-cross-headers-5.14.0-503.11.1.el9_5, kernel-tools-libs-devel-5.14.0-503.11.1.el9_5, libperf-5.14.0-503.11.1.el9_5
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-503.11.1.el9_5, kernel-64k-debug-devel-matched-5.14.0-503.11.1.el9_5, kernel-64k-devel-5.14.0-503.11.1.el9_5 +12
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.4.0-503.11.1.el9_5, kernel-5.14.0-503.11.1.el9_5, kernel-64k-5.14.0-503.11.1.el9_5 +30
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +9
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-503.11.1.el9_5, kernel-rt-core-5.14.0-503.11.1.el9_5, kernel-rt-debug-5.14.0-503.11.1.el9_5 +11
- RHSA-2024:7000 Released 2024-09-24 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.22.1.el8_10, kernel-4.18.0-553.22.1.el8_10, kernel-abi-stablelists-4.18.0-553.22.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.22.1.el8_10
Show 1 more Red Hat advisories
- RHSA-2024:7001 Released 2024-09-24 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-core-4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-debug-4.18.0-553.22.1.rt7.363.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-core-4.18.0-553.22.1.rt7.363.el8_10, kernel-rt-debug-4.18.0-553.22.1.rt7.363.el8_10 +7
Vendor assessments
Red Hat
Red Hat rating: Low. 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 |
| RHOAI-2.13-RHEL-8 | Fixed | — |
| RHOAI-2.14-RHEL-8 | Fixed | — |
| Red Hat CodeReady Linux Builder (v. 9) | Fixed | RHSA-2024:9315 |
| Red Hat CodeReady Linux Builder EUS (v.9.4) | Fixed | RHSA-2025:8248 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:9315 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2025:8248 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2024:7000 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2024:9315 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.4) | Fixed | RHSA-2025:8248 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2024:7000 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2024:7001 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2024:7001 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2024:9315 |
| Red Hat Enterprise Linux Real Time EUS (v.9.4) | Fixed | RHSA-2025:8248 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2024:9315 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) | Fixed | RHSA-2025:8248 |
Not affected: 2 products
- Red Hat CodeReady Linux Builder (v. 9)
- Red Hat Enterprise Linux AppStream (v. 9)
Timeline
- 2026-10-02 Threatist record created from CVE-2023-52840
- 2026-10-03 Alias added: GHSA-rc69-h6px-vf8q
- 2026-10-29 Affected versions changed · Red Hat
- 2026-10-31 Fix available: RHOAI-2.13-RHEL-8, RHOAI-2.14-RHEL-8 · Red Hat
References
Patch 8
- https://git.kernel.org/stable/c/2f236d8638f5b43e0c72919a6a27fe286c32053f
- https://git.kernel.org/stable/c/50d12253666195a14c6cd2b81c376e2dbeedbdff
- https://git.kernel.org/stable/c/6c71e065befb2fae8f1461559b940c04e1071bd5
- https://git.kernel.org/stable/c/303766bb92c5c225cf40f9bbbe7e29749406e2f2
- https://git.kernel.org/stable/c/7082b1fb5321037bc11ba1cf2d7ed23c6b2b521f
- https://git.kernel.org/stable/c/cc56c4d17721dcb10ad4e9c9266e449be1462683
- https://git.kernel.org/stable/c/c8e639f5743cf4b01f8c65e0df075fe4d782b585
- https://git.kernel.org/stable/c/eb988e46da2e4eae89f5337e047ce372fe33d5b1
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Sources
- CVE-2023-52840 · CVE Program
- CVE-2023-52840 · NVD
- FIRST EPSS
- GHSA-rc69-h6px-vf8q · GitHub Advisory Database · CC BY 4.0
- CVE-2023-52840 · Red Hat security data · CC BY 4.0
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