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Linux KernelOperating system · Linux

CVE-2022-48755

MEDIUM · 5.5 CVSS v3.1 Published 2024-06-20
Fix available
A fix is available. Upgrade to 5.10.96 / 5.15.19 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 4.8, < 5.10.96>= 5.11, < 5.15.19>= 5.16, < 5.16.5= 5.17

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 5.10.96 / 5.15.19 / 5.16.5 or later
Fixed in 5.10.965.15.195.16.5
Vendor patch git.kernel.org →
Recommended fix High confidence

Kernel version >= 5.10.96, >= 5.15.19, >= 5.16.5, or >= 5.18 (or later stable releases)

  1. Identify the current kernel version using 'uname -r' or 'cat /proc/version'
  2. Determine which major kernel branch you are running (e.g., 5.10.x, 5.15.x, 5.16.x, 5.17.x)
  3. If running kernel 5.10.x: upgrade to kernel version 5.10.96 or later
  4. If running kernel 5.11.x through 5.15.x: upgrade to kernel version 5.15.19 or later
  5. If running kernel 5.16.x: upgrade to kernel version 5.16.5 or later
  6. If running kernel 5.17.x: upgrade to kernel version 5.18 or later
  7. For ppc64le systems with older PowerPC processors (pre-ISA v2.06 like e5500), ensure the new kernel is compiled with the appropriate POWERPC_CPU options
  8. Verify the fix by checking that the 'ldbrx' instruction is properly guarded in the kernel source or that BPF JIT works without crashes on the affected hardware
Caveat Upgrading kernel major versions may require rebuilding out-of-tree kernel modules; ensure compatibility of hardware drivers and specialized firmware with the new kernel version

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-48755 in production — separate from our analysis above.

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