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NVD / CVE Program· CNA Linux

CVE-2021-46963: scsi: qla2xxx: Fix crash in qla2xxx_mqueuecommand()

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: 0.24% (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 4.19.191, 5.4, 5.4.118.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 4.19.191, 5.4, 5.4.118 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: scsi: qla2xxx: Fix crash in qla2xxx_mqueuecommand() RIP: 0010:kmem_cache_free+0xfa/0x1b0 Call Trace: qla2xxx_mqueuecommand+0x2b5/0x2c0 [qla2xxx] scsi_queue_rq+0x5e2/0xa40 __blk_mq_try_issue_directly+0x128/0x1d0 blk_mq_request_issue_directly+0x4e/0xb0 Fix incorrect call to free srb in qla2xxx_mqueuecommand(), as srb is now allocated by upper layers. This fixes smatch warning of srb unintended free.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 27, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 16th 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.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2021-46963

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 kernel4.19.90 and later · before 4.19.191
  • linux linux kernel5.4.4 and later · before 5.4.118
  • linux linux kernel5.5 and later · before 5.10.36
  • linux linux kernel5.11 and later · before 5.11.20
  • linux linux kernel5.12 and later · before 5.12.3

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

    • 4a1cc2f71bc57cf8dee6f58e7d2355a43aabb312, 5.5affected
    • 64a8c5018a4b21b04a756a56c495ef47c14e92d9 and later · before c5ab9b67d8b061de74e2ca51bf787ee599bd7f89affected · git
    • dea6ee7173039d489977c9ed92e3749154615db4 and later · before 77509a238547863040a42d57c72403f7d4c89a8faffected · git
    • af2a0c51b1205327f55a7e82e530403ae1d42cbb and later · before 702cdaa2c6283c135ef16d52e0e4e3c1005aa538affected · git
    • af2a0c51b1205327f55a7e82e530403ae1d42cbb and later · before 80ef24175df2cba3860d0369d1c662b49ee2de56affected · git
    • af2a0c51b1205327f55a7e82e530403ae1d42cbb and later · before a73208e3244127ef9f2cdf24e4adb947aaa32053affected · git
    • af2a0c51b1205327f55a7e82e530403ae1d42cbb and later · before 6641df81ab799f28a5d564f860233dd26cca0d93affected · git
    • 4.19.90 and later · before 4.19.191affected · semver
    • 5.4.4 and later · before 5.4.118affected · semver
    • 5.3.17 and later · before 5.4affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.10.38-15.10.38-1
SUSE:Linux Enterprise High Availability Extension 12 SP5kernel-defaultbefore 4.12.14-122.216.14.12.14-122.216.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-default-basebefore 5.3.18-150200.24.188.1.150200.9.95.35.3.18-150200.24.188.1.150200.9.95.3
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-docsbefore 5.3.18-150200.24.188.15.3.18-150200.24.188.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-obs-buildbefore 5.3.18-150200.24.188.15.3.18-150200.24.188.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-preemptbefore 5.3.18-150200.24.188.15.3.18-150200.24.188.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-sourcebefore 5.3.18-150200.24.188.15.3.18-150200.24.188.1
SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSkernel-symsbefore 5.3.18-150200.24.188.15.3.18-150200.24.188.1
SUSE:Linux Enterprise Live Patching 12 SP5kgraft-patch-SLE12-SP5_Update_56before 1-8.3.11-8.3.1
SUSE:Linux Enterprise Live Patching 15 SP2kernel-defaultbefore 5.3.18-150200.24.188.15.3.18-150200.24.188.1
SUSE:Linux Enterprise Live Patching 15 SP2kernel-livepatch-SLE15-SP2_Update_47before 1-150200.5.3.31-150200.5.3.3
SUSE:Linux Enterprise Real Time 12 SP5kernel-rtbefore 4.12.14-10.182.14.12.14-10.182.1
SUSE:Linux Enterprise Real Time 12 SP5kernel-rt_debugbefore 4.12.14-10.182.14.12.14-10.182.1
SUSE:Linux Enterprise Real Time 12 SP5kernel-source-rtbefore 4.12.14-10.182.14.12.14-10.182.1
SUSE:Linux Enterprise Real Time 12 SP5kernel-syms-rtbefore 4.12.14-10.182.14.12.14-10.182.1
SUSE:Linux Enterprise Server 12 SP5kernel-azurebefore 4.12.14-16.182.14.12.14-16.182.1
SUSE:Linux Enterprise Server 12 SP5kernel-sourcebefore 4.12.14-122.216.14.12.14-122.216.1
SUSE:Linux Enterprise Server 12 SP5kernel-source-azurebefore 4.12.14-16.182.14.12.14-16.182.1
SUSE:Linux Enterprise Server 12 SP5kernel-symsbefore 4.12.14-122.216.14.12.14-122.216.1
SUSE:Linux Enterprise Server 12 SP5kernel-syms-azurebefore 4.12.14-16.182.14.12.14-16.182.1
SUSE:Linux Enterprise Software Development Kit 12 SP5kernel-docsbefore 4.12.14-122.216.14.12.14-122.216.1
SUSE:Linux Enterprise Software Development Kit 12 SP5kernel-obs-buildbefore 4.12.14-122.216.14.12.14-122.216.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2021-46961Feb 27, 2024 · irqchip/gic-v3: Do not enable irqs when handling spurious interrups
    22Monitor
  • ← EarlierCVE-2021-46962Feb 27, 2024 · mmc: uniphier-sd: Fix a resource leak in the remove function
    22Monitor
  • Later →CVE-2021-46964Feb 27, 2024 · scsi: qla2xxx: Reserve extra IRQ vectors
    22Monitor

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 Linux4.19.191Vendor (CNA)
Linux Linux5.4Vendor (CNA)
Linux Linux5.4.118Vendor (CNA)
Linux Linux6641df81ab799f28a5d564f860233dd26cca0d93Vendor (CNA)
Linux Linux702cdaa2c6283c135ef16d52e0e4e3c1005aa538Vendor (CNA)
Linux Linux77509a238547863040a42d57c72403f7d4c89a8fVendor (CNA)
Linux Linux80ef24175df2cba3860d0369d1c662b49ee2de56Vendor (CNA)
Linux Linuxa73208e3244127ef9f2cdf24e4adb947aaa32053Vendor (CNA)
Linux Linuxc5ab9b67d8b061de74e2ca51bf787ee599bd7f89Vendor (CNA)
debian:linux5.10.38-1 · Debian:12Package registry (OSV)
suse:kernel-azure4.12.14-16.182.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-default5.3.18-150200.24.188.1 · SUSE:Linux Enterprise Live Patching 15 SP2Package registry (OSV)
suse:kernel-default-base5.3.18-150200.24.188.1.150200.9.95.3 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSPackage registry (OSV)
suse:kernel-docs5.3.18-150200.24.188.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP2_Update_471-150200.5.3.3 · SUSE:Linux Enterprise Live Patching 15 SP2Package registry (OSV)
suse:kernel-obs-build5.3.18-150200.24.188.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSPackage registry (OSV)
suse:kernel-preempt5.3.18-150200.24.188.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSPackage registry (OSV)
suse:kernel-rt4.12.14-10.182.1 · SUSE:Linux Enterprise Real Time 12 SP5Package registry (OSV)
suse:kernel-source5.3.18-150200.24.188.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSPackage registry (OSV)
suse:kernel-source-azure4.12.14-16.182.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-syms5.3.18-150200.24.188.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSPackage registry (OSV)
suse:kernel-syms-azure4.12.14-16.182.1 · SUSE:Linux Enterprise Server 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.

No history yet (it accumulates with the daily EPSS job).

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