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CVE-2021-47434· NVD / CVE Program· CNA Linux

xhci: Fix command ring pointer corruption while aborting a command

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 01c2dcb67e71c351006dd17cbba86c26b7f61eaf, 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0, 3.1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 01c2dcb67e71c351006dd17cbba86c26b7f61eaf, 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0, 3.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: xhci: Fix command ring pointer corruption while aborting a command The command ring pointer is located at [6:63] bits of the command ring control register (CRCR). All the control bits like command stop, abort are located at [0:3] bits. While aborting a command, we read the CRCR and set the abort bit and write to the CRCR. The read will always give command ring pointer as all zeros. So we essentially write only the control bits. Since we split the 64 bit write into two 32 bit writes, there is a possibility of xHC command ring stopped before the upper dword (all zeros) is written. If that happens, xHC updates the upper dword of its internal command ring pointer with all zeros. Next time, when the command ring is restarted, we see xHC memory access failures. Fix this issue by only writing to the lower dword of CRCR where all control bits are located.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 22, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 13th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-47434

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 4.14.252
  • linux linux kernel4.15 and later · before 4.19.213
  • linux linux kernel4.20 and later · before 5.4.155
  • linux linux kernel5.5 and later · before 5.10.75
  • linux linux kernel5.11 and later · before 5.14.14
  • linux linux kernel5.15

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • bc47204b268516ae4085ebdc81a34ddda71b77c4, 88bd928daafb5912c269af628b1e5347620c9a62, 2818247b6565b7adfbcd53b74509448a8e1fad84, ef6273930e170a4f70a2c7f57a214813c5cf30bb, f83994f3e2438b982fb9821d948199b3327638d8, 3.7affected
    • b92cc66c047ff7cf587b318fe377061a353c120f and later · before 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0affected · git
    • b92cc66c047ff7cf587b318fe377061a353c120f and later · before 62c182b5e763e5f4062e72678e72ce3e02dd4d1baffected · git
    • b92cc66c047ff7cf587b318fe377061a353c120f and later · before 01c2dcb67e71c351006dd17cbba86c26b7f61eafaffected · git
    • b92cc66c047ff7cf587b318fe377061a353c120f and later · before dec944bb7079b37968cf69c8a438f91f15c4cc61affected · git
    • b92cc66c047ff7cf587b318fe377061a353c120f and later · before e54abefe703ab7c4e5983e889babd1447738ca42affected · git
    • b92cc66c047ff7cf587b318fe377061a353c120f and later · before ff0e50d3564f33b7f4b35cadeabd951d66cfc570affected · git
    • 3.0.49 and later · before 3.1affected · semver
    • 3.2.32 and later · before 3.3affected · semver
    • 3.4.13 and later · before 3.5affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.16-15.14.16-1
SUSE:Linux Enterprise Real Time 12 SP5kernel-rtbefore 4.12.14-10.191.14.12.14-10.191.1
SUSE:Linux Enterprise Real Time 12 SP5kernel-rt_debugbefore 4.12.14-10.191.14.12.14-10.191.1
SUSE:Linux Enterprise Real Time 12 SP5kernel-source-rtbefore 4.12.14-10.191.14.12.14-10.191.1
SUSE:Linux Enterprise Real Time 12 SP5kernel-syms-rtbefore 4.12.14-10.191.14.12.14-10.191.1
SUSE:Linux Enterprise Server 12 SP5kernel-azurebefore 4.12.14-16.191.14.12.14-16.191.1
SUSE:Linux Enterprise Server 12 SP5kernel-source-azurebefore 4.12.14-16.191.14.12.14-16.191.1
SUSE:Linux Enterprise Server 12 SP5kernel-syms-azurebefore 4.12.14-16.191.14.12.14-16.191.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-47316May 21, 2024 · nfsd: fix NULL dereference in nfs3svc_encode_getaclres
    22Monitor
  • ← EarlierCVE-2021-47433May 22, 2024 · btrfs: fix abort logic in btrfs_replace_file_extents
    22Monitor
  • Later →CVE-2021-47435May 22, 2024 · dm: fix mempool NULL pointer race when completing IO
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux01c2dcb67e71c351006dd17cbba86c26b7f61eafVendor (CNA)
Linux Linux22bcb65ea41072ab5d03c0c6290e04e0df6d09a0Vendor (CNA)
Linux Linux3.1Vendor (CNA)
Linux Linux3.3Vendor (CNA)
Linux Linux3.5Vendor (CNA)
Linux Linux3.6Vendor (CNA)
Linux Linux3.7Vendor (CNA)
Linux Linux62c182b5e763e5f4062e72678e72ce3e02dd4d1bVendor (CNA)
Linux Linuxdec944bb7079b37968cf69c8a438f91f15c4cc61Vendor (CNA)
Linux Linuxe54abefe703ab7c4e5983e889babd1447738ca42Vendor (CNA)
Linux Linuxff0e50d3564f33b7f4b35cadeabd951d66cfc570Vendor (CNA)
debian:linux5.14.16-1 · Debian:12Package registry (OSV)
suse:kernel-azure4.12.14-16.191.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-rt4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-rt_debug4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-source-azure4.12.14-16.191.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-source-rt4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-syms-azure4.12.14-16.191.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-syms-rt4.12.14-10.191.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records