CVE-2022-48755

published 2024-06-20

CVE-2022-48755: In the Linux kernel, the following vulnerability has been resolved: powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06 Johan reported the…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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 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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.16.7-1 (bookworm)	linux 5.16.7-1 (bookworm)
linux	linux	—	—
linux	linux	>= 156d0e290e969caba25f1851c52417c14d141b24 < 129c71829d7f46423d95c19e8d87ce956d4c6e1c	129c71829d7f46423d95c19e8d87ce956d4c6e1c
linux	linux	>= 156d0e290e969caba25f1851c52417c14d141b24 < 3bfbc00587dc883eaed383558ae512a351c2cd09	3bfbc00587dc883eaed383558ae512a351c2cd09
linux	linux	>= 156d0e290e969caba25f1851c52417c14d141b24 < aaccfeeee1630b155e8ff0d6c449d3de1ef86e73	aaccfeeee1630b155e8ff0d6c449d3de1ef86e73
linux	linux	>= 156d0e290e969caba25f1851c52417c14d141b24 < 3f5f766d5f7f95a69a630da3544a1a0cee1cdddf	3f5f766d5f7f95a69a630da3544a1a0cee1cdddf
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.103-1	5.10.103-1
linux	linux_kernel	>= 0 < 5.16.7-1	5.16.7-1
linux	linux_kernel	>= 0 < 5.16.7-1	5.16.7-1
linux	linux_kernel	>= 0 < 5.16.7-1	5.16.7-1
linux	linux_kernel	>= 4.8 < 5.10.96	5.10.96
linux	linux_kernel	>= 5.11 < 5.15.19	5.15.19
linux	linux_kernel	>= 5.16 < 5.16.5	5.16.5

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-1281