NVD / CVE Program· CNA Linux

CVE-2021-47485: IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields

Noroxi assessment

Priority: Monitor (action score 31/100)

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 0d4395477741608d123dad51def9fe50b7ebe952, 0f8cdfff06829a0b0348b6debc29ff6a61967724, 3f57c3f67fd93b4da86aeffea1ca32c484d054ad.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0d4395477741608d123dad51def9fe50b7ebe952, 0f8cdfff06829a0b0348b6debc29ff6a61967724, 3f57c3f67fd93b4da86aeffea1ca32c484d054ad 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: IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields Overflowing either addrlimit or bytes_togo can allow userspace to trigger a buffer overflow of kernel memory. Check for overflows in all the places doing math on user controlled buffers.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 22, 2024
Updated: Aug 5, 2026
EPSS: 0.2% · 14th percentile
CWE: CWE-120

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 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: 7.8
CNA · Linux: 7.8; agree

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.

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel2.6.35 and later · before 4.4.292
linux linux kernel4.5 and later · before 4.9.290
linux linux kernel4.10 and later · before 4.14.255
linux linux kernel4.15 and later · before 4.19.216
linux linux kernel4.20 and later · before 5.4.157
linux linux kernel5.5 and later · before 5.10.77
linux linux kernel5.11 and later · before 5.14.16
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
- 2.6.35affected
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before bda41654b6e0c125a624ca35d6d20beb8015b5d0affected · git
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before 3f57c3f67fd93b4da86aeffea1ca32c484d054adaffected · git
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before 60833707b968d5ae02a75edb7886dcd4a957cf0daffected · git
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before 73d2892148aa4397a885b4f4afcfc5b27a325c42affected · git
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before 0f8cdfff06829a0b0348b6debc29ff6a61967724affected · git
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before c3e17e58f571f34c51aeb17274ed02c2ed5cf780affected · git
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before 0d4395477741608d123dad51def9fe50b7ebe952affected · git
- f931551bafe1f10ded7f5282e2aa162c267a2e5d and later · before d39bf40e55e666b5905fdbd46a0dced030ce87beaffected · git
- before 2.6.35not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 5.15.3-1	5.15.3-1
SUSE:Linux Enterprise Micro 5.1	kernel-rt	before 5.3.18-150300.211.1	5.3.18-150300.211.1
SUSE:Linux Enterprise Micro 5.1	kernel-source-rt	before 5.3.18-150300.211.1	5.3.18-150300.211.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-default	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-ec2	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-source	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-syms	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-trace	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-xen	before 3.0.101-108.156.1	3.0.101-108.156.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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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-2021-47483May 22, 2024 · regmap: Fix possible double-free in regcache_rbtree_exit()
31Monitor
← EarlierCVE-2021-47484May 22, 2024 · octeontx2-af: Fix possible null pointer dereference.
22Monitor
Later →CVE-2021-47486May 22, 2024 · riscv, bpf: Fix potential NULL dereference
30Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	0d4395477741608d123dad51def9fe50b7ebe952	Vendor (CNA)
Linux Linux	0f8cdfff06829a0b0348b6debc29ff6a61967724	Vendor (CNA)
Linux Linux	3f57c3f67fd93b4da86aeffea1ca32c484d054ad	Vendor (CNA)
Linux Linux	60833707b968d5ae02a75edb7886dcd4a957cf0d	Vendor (CNA)
Linux Linux	73d2892148aa4397a885b4f4afcfc5b27a325c42	Vendor (CNA)
Linux Linux	bda41654b6e0c125a624ca35d6d20beb8015b5d0	Vendor (CNA)
Linux Linux	c3e17e58f571f34c51aeb17274ed02c2ed5cf780	Vendor (CNA)
Linux Linux	d39bf40e55e666b5905fdbd46a0dced030ce87be	Vendor (CNA)
debian:linux	5.15.3-1 · Debian:12	Package registry (OSV)
suse:kernel-default	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-ec2	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-rt	5.3.18-150300.211.1 · SUSE:Linux Enterprise Micro 5.1	Package registry (OSV)
suse:kernel-source	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-source-rt	5.3.18-150300.211.1 · SUSE:Linux Enterprise Micro 5.1	Package registry (OSV)
suse:kernel-syms	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-trace	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-xen	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package 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.

CVE-2023-44466236 days apartAn issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5.
49Plan
CVE-2023-527351 days apartbpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself
36Monitor
CVE-2024-2692724 days apartASoC: SOF: Add some bounds checking to firmware data
33Monitor
CVE-2021-473471 days apartwl1251: Fix possible buffer overflow in wl1251_cmd_scan
31Monitor
CVE-2024-274075 days apartfs/ntfs3: Fixed overflow check in mi_enum_attr()
31Monitor
CVE-2024-2704521 days apartdrm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()'
31Monitor

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.

TR-24-0527 · May 23, 2024(Linux Kernel Güncellemesi)

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

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

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

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

References

git.kernel.org/stable/c/0d4395477741608d123dad51def9fe50b7ebe952

Show all references (7 more)

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

All records