CVE-2022-48755

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

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.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.05%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/129c71829d7f46423d95c19e8d87ce956d4c6e1c	patch
https://git.kernel.org/stable/c/3bfbc00587dc883eaed383558ae512a351c2cd09	patch
https://git.kernel.org/stable/c/aaccfeeee1630b155e8ff0d6c449d3de1ef86e73	patch
https://git.kernel.org/stable/c/3f5f766d5f7f95a69a630da3544a1a0cee1cdddf	patch

Frequently Asked Questions

What is the severity of CVE-2022-48755?: CVE-2022-48755 has been scored as a medium severity vulnerability.
How to fix CVE-2022-48755?: To fix CVE-2022-48755, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-48755 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-48755 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-48755?: CVE-2022-48755 affects Linux Linux, Linux Linux.