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CVE Record

CVE-2022-48874: misc: fastrpc: Fix use-after-free and race in fastrpc_map_find

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix use-after-free and race in fastrpc_map_find Currently, there is a race window between the point when the mutex is unlocked in fastrpc_map_lookup and the reference count increasing (fastrpc_map_get) in fastrpc_map_find, which can also lead to use-after-free. So lets merge fastrpc_map_find into fastrpc_map_lookup which allows us to both protect the maps list by also taking the &fl->lock spinlock and the reference count, since the spinlock will be released only after. Add take_ref argument to make this suitable for all callers.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2022-48874 is a Linux kernel memory-safety bug in the fastrpc component. A race condition can cause a use-after-free, which is the kind of flaw that may crash affected systems or create deeper kernel risk. The public sources do not provide CVSS, attacker prerequisites, or confirmed exploitation.

Executive priority

Track and remediate through normal kernel patch management unless local exposure analysis finds fastrpc use on sensitive systems. The bug is in kernel memory handling, but the public record lacks severity scoring, exploit evidence, and concrete impact detail.

Technical view

The issue is a race between unlocking a mutex in fastrpc_map_lookup and incrementing a reference count in fastrpc_map_find. The kernel fix merges fastrpc_map_find into fastrpc_map_lookup so list protection and reference handling occur under the appropriate spinlock before release.

Likely exposure

Exposure appears limited to Linux kernels in the affected version ranges where the fastrpc code is present and used. The source lists Linux kernel versions including 5.18, 6.1.8, and 6.2 as affected, but does not describe distributions, configurations, or default deployment exposure.

Exploitation context

The source bundle does not show CISA KEV listing, public exploitation, exploit availability, or attacker access requirements. Treat exploitation status as unconfirmed. Researchers should avoid assuming local or remote reachability without validating how fastrpc is exposed on the target system.

Researcher notes

The strongest evidence is the upstream fix description: a use-after-free race in fastrpc_map_find/lookup fixed by changing locking and reference-count flow. Impact and prerequisites are not described in the provided sources, so validation should focus on affected kernel code presence and vendor backport status.

Mitigation direction

  • Check vendor or distribution advisories for CVE-2022-48874 coverage.
  • Apply kernel updates that include the referenced stable fixes.
  • Confirm distribution backports, not just upstream version numbers.
  • Limit reliance on affected fastrpc functionality where operationally feasible.
  • Prioritize systems using affected Linux kernel branches.

Validation and detection

  • Inventory running Linux kernel versions across managed systems.
  • Identify systems where the fastrpc driver or functionality is present.
  • Compare kernel builds against vendor advisories for this CVE.
  • Verify patched builds include the referenced upstream stable fixes.
  • Correlate scanner findings with actual kernel package backport status.
Prepared
Confidence
medium
Sources
4

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.

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CVE-2022-48874 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
1ADP providers
3Source 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

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux8f6c1d8c4f0cc316b0456788fff8373554d1d99d, 8f6c1d8c4f0cc316b0456788fff8373554d1d99dunaffected
LinuxLinux5.18, 0, 6.1.8, 6.2affected
Weakness

CWE details

No CWE listed

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