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CVE Record

CVE-2022-50329: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq Commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'") will access 'bic->bfqq' in bic_set_bfqq(), however, bfq_exit_icq_bfqq() can free bfqq first, and then call bic_set_bfqq(), which will cause uaf. Fix the problem by moving bfq_exit_bfqq() behind bic_set_bfqq().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2022-50329 is a Linux kernel memory-safety bug in the BFQ block I/O scheduler. The kernel could reference a BFQ queue after it was freed. Business urgency depends on whether your Linux fleet runs affected kernel builds and uses BFQ. The provided sources include no CVSS score or confirmed exploitation.

Executive priority

Treat this as a kernel patch-management item, not a confirmed emergency. Prioritize validation on critical Linux infrastructure, storage-heavy systems, and hosts where kernel updates lag. Escalate if your Linux vendor rates the issue higher or confirms affected shipped kernels.

Technical view

The issue is a use-after-free in bfq_exit_icq_bfqq(). A prior change made bic_set_bfqq() access bic->bfqq, but bfq_exit_icq_bfqq() could free bfqq before that call. The kernel fix changes ordering so bic_set_bfqq() runs before bfq_exit_bfqq().

Likely exposure

Potentially exposed systems are Linux hosts running affected kernel commits or listed kernel releases, especially where BFQ is enabled or selectable. The source bundle lists Linux kernel commits and versions 5.15.86, 6.0.16, and 6.1.2, but does not provide distribution-specific package mappings.

Exploitation context

No active exploitation is reported in the provided sources, and the CVE is not marked as CISA KEV. The sources do not describe exploit prerequisites, attacker position, or impact beyond the kernel use-after-free condition.

Researcher notes

The evidence is limited to the CVE record and upstream stable commits. There is no CVSS, CWE, exploit confirmation, or distribution advisory detail in the bundle. Analysis should focus on mapping the BFQ fix into downstream kernel packages and verifying whether BFQ is reachable in target environments.

Mitigation direction

  • Check Linux vendor advisories for patched kernel packages covering CVE-2022-50329.
  • Prioritize kernel updates on systems using or allowing the BFQ scheduler.
  • Track distribution backports rather than relying only on upstream version numbers.
  • Confirm change-control coverage for appliances and container hosts running Linux kernels.

Validation and detection

  • Inventory kernel versions and vendor package builds across Linux assets.
  • Check whether BFQ is enabled, loaded, or configured as an I/O scheduler.
  • Compare fleet kernels against vendor advisories and upstream stable references.
  • Verify patched builds include the referenced BFQ ordering fix.
Prepared
Confidence
medium
Sources
7

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-2022-50329 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
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a, 094f3d9314d67691cb21ba091c1b528f6e3c4893, b22fd72bfebda3956efc4431b60ddfc0a51e03e0, 761564d93c8265f65543acf0a576b32d66bfa26a, 64dc8c732f5c2b406cc752e6aaa1bd5471159cabunaffected
LinuxLinux5.15.86, 6.0.16, 6.1.2unaffected
Weakness

CWE details

No CWE listed

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