🛡️ CVE-2022-48755 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2022-48755 is recorded against 2 packages.

  • kernel (from 5.16.0 up to 5.16.5)
  • linux-kernel

Timeline and source

Published on 20 June 2024 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2022-48755 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-06-20
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 5.16.0 5.16.5
linux-kernel — —

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