net: ch9200: fix uninitialised access during mii_nway_restart
Priority LOW 24CWE-908Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 35 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-908 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ch9200: fix uninitialised access during mii_nway_restart In mii_nway_restart() the code attempts to call mii->mdio_read which is ch9200_mdio_read(). ch9200_mdio_read() utilises a local buffer called "buff", which is initialised with control_read(). However "buff" is conditionally initialised inside control_read(): if (err == size) { memcpy(data, buf, size); } If the condition of "err == size" is not met, then "buff" remains uninitialised. Once this happens the uninitialised "buff" is accessed and returned during ch9200_mdio_read(): return (buff[0] | buff[1] << 8); The problem stems from the fact that ch9200_mdio_read() ignores the return value of control_read(), leading to uinit-access of "buff". To fix this we should check the return value of control_read() and return early on error.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00206 10th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.295, 5.10.239, 5.15.186 +5Red Hat: 13 advisoriesRed Hat: 35 fixed, 1 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 | 4.3 and later | 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4, 6.16 | Patch available | CNA |
- Linux VendorLinux Affected 4.3 and later Fixed in 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4, 6.16 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.3.1 to before 5.4.295; 5.5 to before 5.10.239; 5.11 to before 5.15.186; 5.16 to before 6.1.142; 6.2 to before 6.6.95; 6.7 to before 6.12.35; 6.13 to before 6.15.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.3:-:*:*:*:*:*:* | 4.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.3:rc3:*:*:*:*:*:* | 4.3 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.3:rc4:*:*:*:*:*:* | 4.3 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.3:rc5:*:*:*:*:*:* | 4.3 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.3:rc6:*:*:*:*:*:* | 4.3 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.3:rc7:*:*:*:*:*:* | 4.3 rc7 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.3.1 to before 5.4.295; 5.5 to before 5.10.239; 5.11 to before 5.15.186; 5.16 to before 6.1.142; 6.2 to before 6.6.95; 6.7 to before 6.12.35; 6.13 to before 6.15.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.3:-:*:*:*:*:*:* Versions 4.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.3:rc3:*:*:*:*:*:* Versions 4.3 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.3:rc4:*:*:*:*:*:* Versions 4.3 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.3:rc5:*:*:*:*:*:* Versions 4.3 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.3:rc6:*:*:*:*:*:* Versions 4.3 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.3:rc7:*:*:*:*:*:* Versions 4.3 rc7 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.95, 6.12.35, 6.15.4, 6.16
Red Hat 13 advisories
- RHSA-2025:14418 Released 2025-08-25 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.106.1.el8_8, kernel-4.18.0-477.106.1.el8_8, kernel-abi-stablelists-4.18.0-477.106.1.el8_8 +14
- Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.106.1.el8_8, kernel-4.18.0-477.106.1.el8_8, kernel-abi-stablelists-4.18.0-477.106.1.el8_8 +14
- RHSA-2025:14136 Released 2025-08-20 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.164.1.el8_2, kernel-4.18.0-193.164.1.el8_2, kernel-abi-whitelists-4.18.0-193.164.1.el8_2 +14
- RHSA-2025:14094 Released 2025-08-19 · Red Hat rating Moderatekernel-rt security update
- Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-core-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-5.14.0-70.142.1.rt21.214.el9_0 +9
- Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-core-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-5.14.0-70.142.1.rt21.214.el9_0 +7
Show 10 more Red Hat advisories
- RHSA-2025:14054 Released 2025-08-19 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.142.1.el9_0, kernel-debug-devel-matched-5.14.0-70.142.1.el9_0, kernel-devel-5.14.0-70.142.1.el9_0 +5
- Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.142.1.el9_0, kernel-5.14.0-70.142.1.el9_0, kernel-abi-stablelists-5.14.0-70.142.1.el9_0 +14
- RHSA-2025:13946 Released 2025-08-18 · Red Hat rating Moderatekernel security update
- Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.83.1.el9_4, libperf-5.14.0-427.83.1.el9_4
- Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.83.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.83.1.el9_4, kernel-64k-devel-5.14.0-427.83.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.83.1.el9_4, kernel-5.14.0-427.83.1.el9_4, kernel-64k-5.14.0-427.83.1.el9_4 +29
- Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.83.1.el9_4, kernel-rt-core-5.14.0-427.83.1.el9_4, kernel-rt-debug-5.14.0-427.83.1.el9_4 +9
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- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.168.1.el8_4, kernel-4.18.0-305.168.1.el8_4, kernel-abi-stablelists-4.18.0-305.168.1.el8_4 +14
- RHSA-2025:13781 Released 2025-08-13 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.130.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.130.1.el9_2, kernel-64k-devel-5.14.0-284.130.1.el9_2 +10
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- RHSA-2025:13776 Released 2025-08-13 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.157.1.el8_6, kernel-4.18.0-372.157.1.el8_6, kernel-abi-stablelists-4.18.0-372.157.1.el8_6 +14
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- RHSA-2025:13633 Released 2025-08-11 · Red Hat rating Moderatekernel-rt security update
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- RHSA-2025:12662 Released 2025-08-04 · Red Hat rating Importantkernel security update
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- RHSA-2025:11861 Released 2025-07-28 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.30.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.30.1.el9_6, kernel-64k-devel-5.14.0-570.30.1.el9_6 +12
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Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.9.4) | Fixed | RHSA-2025:13946 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2025:11861 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2025:14054 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2025:13781 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2025:13946 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:11455 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2025:11861 |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:14136 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2025:13805 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2025:13776 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2025:13776 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2025:14418 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2025:14054 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2025:13781 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.4) | Fixed | RHSA-2025:13946 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2025:13805 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2025:13776 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2025:14418 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2025:11455 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2025:11861 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2025:11456 |
| Red Hat Enterprise Linux NFV E4S (v.9.0) | Fixed | RHSA-2025:14094 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2025:11456 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2025:11861 |
| Red Hat Enterprise Linux Real Time E4S (v.9.0) | Fixed | RHSA-2025:14094 |
| Red Hat Enterprise Linux Real Time E4S (v.9.2) | Fixed | RHSA-2025:13633 |
| Red Hat Enterprise Linux Real Time EUS (v.9.4) | Fixed | RHSA-2025:13946 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2025:11861 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) | Fixed | RHSA-2025:13633 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) | Fixed | RHSA-2025:13946 |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2025-38086
- 2026-10-03 Alias added: GHSA-33v2-gr7f-4wmr
- 2026-11-05 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/119766de4930ff40db9f36b960cb53b0c400e81b
- https://git.kernel.org/stable/c/33163c68d2e3061fa3935b5f0a1867958b1cdbd2
- https://git.kernel.org/stable/c/9da3e442714f7f4393ff01c265c4959c03e88c2f
- https://git.kernel.org/stable/c/9a350f30d65197354706b7759b5c89d6c267b1a9
- https://git.kernel.org/stable/c/6bd2569d0b2f918e9581f744df0263caf73ee76c
- https://git.kernel.org/stable/c/4da7fcc098218ff92b2e83a43f545c02f714cedd
- https://git.kernel.org/stable/c/cdaa6d1cb2ff1219c6c822b27655dd170ffb0f72
- https://git.kernel.org/stable/c/9ad0452c0277b816a435433cca601304cfac7c21
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Sources
- CVE-2025-38086 · CVE Program
- CVE-2025-38086 · NVD
- FIRST EPSS
- GHSA-33v2-gr7f-4wmr · GitHub Advisory Database · CC BY 4.0
- CVE-2025-38086 · Red Hat security data · CC BY 4.0
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