CVE-2023-54220
serial: 8250: Fix oops for port->pm on uart_change_pm()
Reported by linux · Published December 30, 2025
In the Linux kernel, the following vulnerability has been resolved: serial: 8250: Fix oops for port->pm on uart_change_pm() Unloading a hardware specific 8250 driver can produce error "Unable to handle kernel paging request at virtual address" about ten seconds after unloading the driver. This happens on uart_hangup() calling uart_change_pm(). Turns out commit 04e82793f068 ("serial: 8250: Reinit port->pm on port specific driver unbind") was only a partial fix. If the hardware specific driver has initialized port->pm function, we need to clear port->pm too. Just reinitializing port->ops does not do this. Otherwise serial8250_pm() will call port->pm() instead of serial8250_do_pm().
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| kernel-tools | Amazon Linux | 6.1.49-69.116.amzn2023 |
| kernel-livepatch-6.1.49-69.116 | Amazon Linux | 1.0-0.amzn2023 |
| kernel | Amazon Linux | 4.14.326-245.539.amzn2 |
| kernel-libbpf-devel | Amazon Linux | 6.1.49-69.116.amzn2023 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 490bf37eaabb0a857ed1ae8e75d8854e41662f1c, c9e080c3005fd183c56ff8f4d75edb5da0765d2c, d5cd2928d31042a7c0a01464f9a8d95be736421d |
| Linux | Linux | 6.4, 0, 4.14.324 |
| amazon:2023 | kernel-tools | 0 |
| amazon:2023 | kernel-livepatch-6.1.49-69.116 | 0 |
| amazon:2 | kernel | 0 |
| amazon:2023 | kernel-libbpf-devel | 0 |
| Linux | Linux | 5.10.181, 5.4.244, 4.19.284 |
| amazon:2 | kernel-headers | 0 |
| amazon:2 | kernel-devel | 0 |
| amazon:2023 | kernel-devel | 0 |
| amazon:2 | kernel-tools-devel | 0 |
| amazon:2023 | kernel-headers | 0 |
| amazon:2 | perf | 0 |
| amazon:2023 | kernel | 0 |
| amazon:2 | python-perf | 0 |
| amazon:2023 | bpftool | 0 |
| amazon:2023 | perf | 0 |
| amazon:2 | kernel-tools | 0 |
| amazon:2023 | kernel-libbpf | 0 |
| amazon:2023 | kernel-tools-devel | 0 |
…and 4 more
Timeline
- Dec 30, 2025 CVE Published
- Dec 31, 2025 EPSS Score (30 in total, the first dated here)
- Jun 2, 2026 Security Advisory (25 in total, the first dated here)
- Jul 27, 2026 Coalition ESS Score
- Oct 4, 2026 Distribution Patch (24 in total, the first dated here)
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