# CVE-2022-48755: linux: In the Linux kernel, the following vulnerability has been resolved:  powerpc64/bpf: Limit 'ldbrx' to processors compl...

CVE-2022-48755 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48755, released June 20, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48755
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 20, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06  Johan reported the below crash with test_bpf on ppc64 e5500:    test_bpf: #296 ALU_END_FROM_LE 64: 0x0123456789abcdef -> 0x67452301 jited:1   Oops: Exception in kernel mode, sig: 4 [#1]   BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500   Modules linked in: test_bpf(+)   CPU: 0 PID: 76 Comm: insmod Not tainted 5.14.0-03771-g98c2059e008a-dirty #1   NIP:  8000000000061c3c LR: 80000000006dea64 CTR: 8000000000061c18   REGS: c0000000032d3420 TRAP: 0700   Not tainted (5.14.0-03771-g98c2059e008a-dirty)   MSR:  0000000080089000 <EE,ME>  CR: 88002822  XER: 20000000 IRQMASK: 0   <...>   NIP [8000000000061c3c] 0x8000000000061c3c   LR [80000000006dea64] .__run_one+0x104/0x17c [test_bpf]   Call Trace:    .__run_one+0x60/0x17c [test_bpf] (unreliable)    .test_bpf_init+0x6a8/0xdc8 [test_bpf]    .do_one_initcall+0x6c/0x28c    .do_init_module+0x68/0x28c    .load_module+0x2460/0x2abc    .__do_sys_init_module+0x120/0x18c    .system_call_exception+0x110/0x1b8    system_call_common+0xf0/0x210   --- interrupt: c00 at 0x101d0acc   <...>   ---[ end trace 47b2bf19090bb3d0 ]---    Illegal instruction  The illegal instruction turned out to be 'ldbrx' emitted for BPF_FROM_[L|B]E, which was only introduced in ISA v2.06. Guard use of the same and implement an alternative approach for older processors.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.7-1 | [DEBIAN-CVE-2022-48755](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48755.md) | Jun 20, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.7-1 | [DEBIAN-CVE-2022-48755](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48755.md) | Jun 20, 2024 |
| Linux | linux Debian 14 | 5.16.7-1 | [DEBIAN-CVE-2022-48755](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48755.md) | Jun 20, 2024 |

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