# CVE-2022-50320: linux: In the Linux kernel, the following vulnerability has been resolved:  ACPI: tables: FPDT: Don't call acpi_os_map_memor...

CVE-2022-50320 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50320, released September 15, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-50320
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 15, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  ACPI: tables: FPDT: Don't call acpi_os_map_memory() on invalid phys address  On a Packard Bell Dot SC (Intel Atom N2600 model) there is a FPDT table which contains invalid physical addresses, with high bits set which fall outside the range of the CPU-s supported physical address range.  Calling acpi_os_map_memory() on such an invalid phys address leads to the below WARN_ON in ioremap triggering resulting in an oops/stacktrace.  Add code to verify the physical address before calling acpi_os_map_memory() to fix / avoid the oops.  [    1.226900] ioremap: invalid physical address 3001000000000000 [    1.226949] ------------[ cut here ]------------ [    1.226962] WARNING: CPU: 1 PID: 1 at arch/x86/mm/ioremap.c:200 __ioremap_caller.cold+0x43/0x5f [    1.226996] Modules linked in: [    1.227016] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.0.0-rc3+ #490 [    1.227029] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013 [    1.227038] RIP: 0010:__ioremap_caller.cold+0x43/0x5f [    1.227054] Code: 96 00 00 e9 f8 af 24 ff 89 c6 48 c7 c7 d8 0c 84 99 e8 6a 96 00 00 e9 76 af 24 ff 48 89 fe 48 c7 c7 a8 0c 84 99 e8 56 96 00 00 <0f> 0b e9 60 af 24 ff 48 8b 34 24 48 c7 c7 40 0d 84 99 e8 3f 96 00 [    1.227067] RSP: 0000:ffffb18c40033d60 EFLAGS: 00010286 [    1.227084] RAX: 0000000000000032 RBX: 3001000000000000 RCX: 0000000000000000 [    1.227095] RDX: 0000000000000001 RSI: 00000000ffffdfff RDI: 00000000ffffffff [    1.227105] RBP: 3001000000000000 R08: 0000000000000000 R09: ffffb18c40033c18 [    1.227115] R10: 0000000000000003 R11: ffffffff99d62fe8 R12: 0000000000000008 [    1.227124] R13: 0003001000000000 R14: 0000000000001000 R15: 3001000000000000 [    1.227135] FS:  0000000000000000(0000) GS:ffff913a3c080000(0000) knlGS:0000000000000000 [    1.227146] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [    1.227156] CR2: 0000000000000000 CR3: 0000000018c26000 CR4: 00000000000006e0 [    1.227167] Call Trace: [    1.227176]  <TASK> [    1.227185]  ? acpi_os_map_iomem+0x1c9/0x1e0 [    1.227215]  ? kmem_cache_alloc_trace+0x187/0x370 [    1.227254]  acpi_os_map_iomem+0x1c9/0x1e0 [    1.227288]  acpi_init_fpdt+0xa8/0x253 [    1.227308]  ? acpi_debugfs_init+0x1f/0x1f [    1.227339]  do_one_initcall+0x5a/0x300 [    1.227406]  ? rcu_read_lock_sched_held+0x3f/0x80 [    1.227442]  kernel_init_freeable+0x28b/0x2cc [    1.227512]  ? rest_init+0x170/0x170 [    1.227538]  kernel_init+0x16/0x140 [    1.227552]  ret_from_fork+0x1f/0x30 [    1.227639]  </TASK> [    1.227647] irq event stamp: 186819 [    1.227656] hardirqs last  enabled at (186825): [<ffffffff98184a6e>] __up_console_sem+0x5e/0x70 [    1.227672] hardirqs last disabled at (186830): [<ffffffff98184a53>] __up_console_sem+0x43/0x70 [    1.227686] softirqs last  enabled at (186576): [<ffffffff980fbc9d>] __irq_exit_rcu+0xed/0x160 [    1.227701] softirqs last disabled at (186569): [<ffffffff980fbc9d>] __irq_exit_rcu+0xed/0x160 [    1.227715] ---[ end trace 0000000000000000 ]---

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.3-1 | [DEBIAN-CVE-2022-50320](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50320.md) | Sep 15, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.3-1 | [DEBIAN-CVE-2022-50320](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50320.md) | Sep 15, 2025 |
| Linux | linux Debian 14 | 6.0.3-1 | [DEBIAN-CVE-2022-50320](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50320.md) | Sep 15, 2025 |

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