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CVE Record

CVE-2022-48770: bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack()

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack() task_pt_regs() can return NULL on powerpc for kernel threads. This is then used in __bpf_get_stack() to check for user mode, resulting in a kernel oops. Guard against this by checking return value of task_pt_regs() before trying to obtain the call chain.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel bug can crash the kernel when BPF stack collection touches missing register state on powerpc kernel threads. The source describes a kernel oops, so the business risk is availability disruption, not confirmed data theft or privilege escalation.

Executive priority

Treat as a targeted availability risk for relevant Linux fleets, especially powerpc systems. Prioritize patch confirmation over emergency response unless internal evidence shows crashes or vendor advisories rate it higher.

Technical view

bpf_get_task_stack() can reach __bpf_get_stack() with task_pt_regs() returning NULL on powerpc kernel threads. The missing NULL check can lead to dereferencing absent pt_regs while checking user mode, causing a kernel oops. Stable kernel commits add a guard before obtaining the call chain.

Likely exposure

Exposure appears limited to Linux systems running affected kernels where powerpc kernel-thread stack collection through BPF paths is reachable. The bundle does not identify affected distributions, appliances, cloud images, or package names.

Exploitation context

No active exploitation is stated in the provided sources, and the CVE is not marked KEV. The available evidence supports a crash/oops condition, but does not describe public exploitation, remote reachability, or weaponized procedures.

Researcher notes

The source evidence is narrow: a NULL pt_regs path on powerpc kernel threads during BPF stack collection. There is no CVSS, CWE, exploit report, or distribution matrix in the bundle, so exposure assessment should rely on kernel provenance and vendor backports.

Mitigation direction

  • Apply Linux stable kernel updates containing the referenced fixes.
  • Check distribution vendor advisories for backported kernel packages.
  • Prioritize powerpc Linux systems using BPF tracing or observability.
  • Schedule maintenance where kernel replacement requires reboot.
  • Do not assume non-powerpc impact without vendor confirmation.

Validation and detection

  • Inventory Linux kernel versions and CPU architectures.
  • Confirm installed kernels include a referenced stable fix or vendor backport.
  • Review kernel logs for oops events involving BPF stack collection.
  • Test BPF tracing workflows after kernel update.
  • Track distro advisory status for each deployed kernel stream.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2022-48770 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxfa28dcb82a38f8e3993b0fae9106b1a80b59e4f0, fa28dcb82a38f8e3993b0fae9106b1a80b59e4f0, fa28dcb82a38f8e3993b0fae9106b1a80b59e4f0, fa28dcb82a38f8e3993b0fae9106b1a80b59e4f0unaffected
LinuxLinux5.9, 0, 5.10.96, 5.15.19, 5.16.5, 5.17affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.