CVE-2021-47374: dma-debug: prevent an error message from causing runtime problems
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: 0.50% (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 510e1a724ab1bf38150be2c1acabb303f98d0047, de4afec2d2946c92c62a15ab341c70b287289e6a.
- Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 510e1a724ab1bf38150be2c1acabb303f98d0047, de4afec2d2946c92c62a15ab341c70b287289e6a 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: dma-debug: prevent an error message from causing runtime problems For some drivers, that use the DMA API. This error message can be reached several millions of times per second, causing spam to the kernel's printk buffer and bringing the CPU usage up to 100% (so, it should be rate limited). However, since there is at least one driver that is in the mainline and suffers from the error condition, it is more useful to err_printk() here instead of just rate limiting the error message (in hopes that it will make it easier for other drivers that suffer from this issue to be spotted).
- Published
- May 21, 2024
- Updated
- Aug 5, 2026
- EPSS
- 0.5% · 43th percentile
- CWE
- CWE-770
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
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
- 7.5
- 2.0 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
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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.
We use this product, ask for helpAffected 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 kernelbefore 5.14.9
- 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
- 5.14affected
- 2b4bbc6231d789f58676d2ccc42177df163e1c4a and later · before de4afec2d2946c92c62a15ab341c70b287289e6aaffected · git
- 2b4bbc6231d789f58676d2ccc42177df163e1c4a and later · before 510e1a724ab1bf38150be2c1acabb303f98d0047affected · git
- before 5.14not affected · semver
- 5.14.9 and later · up to and including 5.14.*not affected · semver
- 5.15 and laternot affected · original_commit_for_fix
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 5.14.9-1 | 5.14.9-1 |
| openSUSE:Leap 15.5 | dtb-aarch64 | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-64kb | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-debug | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-default | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-default-base | before 5.14.21-150500.55.68.1.150500.6.31.1 | 5.14.21-150500.55.68.1.150500.6.31.1 |
| openSUSE:Leap 15.5 | kernel-docs | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-kvmsmall | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-obs-build | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-obs-qa | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-source | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-syms | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap 15.5 | kernel-zfcpdump | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| openSUSE:Leap Micro 5.3 | kernel-rt | before 5.14.21-150400.15.82.1 | 5.14.21-150400.15.82.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_15 | before 1-150500.11.3.1 | 1-150500.11.3.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-rt | before 5.14.21-150400.15.82.1 | 5.14.21-150400.15.82.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source-rt | before 5.14.21-150400.15.82.1 | 5.14.21-150400.15.82.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.68.1.150500.6.31.1 | 5.14.21-150500.55.68.1.150500.6.31.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP5 | kernel-64kb | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP5 | kernel-source | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP5 | kernel-zfcpdump | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP5 | kernel-docs | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP5 | kernel-obs-build | before 5.14.21-150500.55.68.1 | 5.14.21-150500.55.68.1 |
+1
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2021-47372May 21, 2024 · net: macb: fix use after free on rmmod31Monitor
- ← EarlierCVE-2021-47373May 21, 2024 · irqchip/gic-v3-its: Fix potential VPE leak on error22Monitor
- Later →CVE-2021-47375May 21, 2024 · blktrace: Fix uaf in blk_trace access after removing by sysfs24Monitor
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 | 510e1a724ab1bf38150be2c1acabb303f98d0047 | Vendor (CNA) |
| Linux Linux | de4afec2d2946c92c62a15ab341c70b287289e6a | Vendor (CNA) |
| debian:linux | 5.14.9-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-64kb | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-debug | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-default | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-default-base | 5.14.21-150500.55.68.1.150500.6.31.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-docs | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-obs-build | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-rt | 5.14.21-150400.15.82.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:kernel-source | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-syms | 5.14.21-150500.55.68.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150500.55.68.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP5 | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150500.55.68.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150500.55.68.1.150500.6.31.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150500.55.68.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP5 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_15 | 1-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150500.55.68.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP5 | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150400.15.82.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150500.55.68.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP5 | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150400.15.82.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150500.55.68.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP5 | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150500.55.68.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP5 | 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 researchersFinders, 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-2021-4713757 days apartnet: lantiq: fix memory corruption in RX ring39Monitor
- CVE-2024-359691 days apartipv6: fix race condition between ipv6_get_ifaddr and ipv6_del_addr35Monitor
- CVE-2021-475513 days apartdrm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again31Monitor
- CVE-2024-3402734 days apartf2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock31Monitor
- CVE-2021-4713067 days apartnvmet: fix freeing unallocated p2pmem30Monitor
- CVE-2024-2689434 days apartACPI: processor_idle: Fix memory leak in acpi_processor_power_exit()24Monitor
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-24-0519 · May 22, 2024(Linux Kernel Güncellemesi)
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)
CWE-770 · Allocation of Resources Without Limits or ThrottlingCVSS 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.
Attack patterns (CAPEC)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (1 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.