CVE-2021-47587: net: systemport: Add global locking for descriptor lifecycle
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: 0.54% (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 595a684fa6f23b21958379a18cfa83862c73c2e1, 6e1011cd183faae8daff275c72444edcdfe0d473, 8b8e6e782456f1ce02a7ae914bbd5b1053f0b034.
- Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 5.5.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 595a684fa6f23b21958379a18cfa83862c73c2e1, 6e1011cd183faae8daff275c72444edcdfe0d473, 8b8e6e782456f1ce02a7ae914bbd5b1053f0b034 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: net: systemport: Add global locking for descriptor lifecycle The descriptor list is a shared resource across all of the transmit queues, and the locking mechanism used today only protects concurrency across a given transmit queue between the transmit and reclaiming. This creates an opportunity for the SYSTEMPORT hardware to work on corrupted descriptors if we have multiple producers at once which is the case when using multiple transmit queues. This was particularly noticeable when using multiple flows/transmit queues and it showed up in interesting ways in that UDP packets would get a correct UDP header checksum being calculated over an incorrect packet length. Similarly TCP packets would get an equally correct checksum computed by the hardware over an incorrect packet length. The SYSTEMPORT hardware maintains an internal descriptor list that it re-arranges when the driver produces a new descriptor anytime it writes to the WRITE_PORT_{HI,LO} registers, there is however some delay in the hardware to re-organize its descriptors and it is possible that concurrent TX queues eventually break this internal allocation scheme to the point where the length/status part of the descriptor gets used for an incorrect data buffer. The fix is to impose a global serialization for all TX queues in the short section where we are writing to the WRITE_PORT_{HI,LO} registers which solves the corruption even with multiple concurrent TX queues being used.
- Published
- Jun 19, 2024
- Updated
- Aug 5, 2026
- EPSS
- 0.5% · 45th percentile
- CWE
- CWE-667
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
- 9.8
- 4.3 point gap
CVSS:3.1/AV:N/AC:L/PR:N/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.
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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 kernel3.16 and later · before 4.4.296
- linux linux kernel4.5 and later · before 4.9.294
- linux linux kernel4.10 and later · before 4.14.259
- linux linux kernel4.15 and later · before 4.19.222
- linux linux kernel4.20 and later · before 5.4.168
- linux linux kernel5.5 and later · before 5.10.88
- linux linux kernel5.11 and later · before 5.15.11
- linux linux kernel5.16
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
- 3.16affected
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before 8ed2f5d08d6e59f8c78b2869bfb95d0be32c094caffected · git
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before de57f62f76450b934de8203711bdc4f7953c3421affected · git
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before f3fde37d3f0d429f0fcce214cb52588a9e21260eaffected · git
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before 595a684fa6f23b21958379a18cfa83862c73c2e1affected · git
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before c675256a7f131f5ba3f331efb715e8f31ea0e392affected · git
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before 6e1011cd183faae8daff275c72444edcdfe0d473affected · git
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before eb4687c7442942e115420a30185f8d83faf37696affected · git
- 80105befdb4b8cea924711b40b2462b87df65b62 and later · before 8b8e6e782456f1ce02a7ae914bbd5b1053f0b034affected · git
- before 3.16not 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 5.15.15-1 | 5.15.15-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.128.1 | 5.14.21-150400.24.128.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.128.1 | 5.14.21-150400.24.128.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.128.1 | 5.14.21-150400.24.128.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-source | before 5.14.21-150400.24.128.1 | 5.14.21-150400.24.128.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.128.1 | 5.14.21-150400.24.128.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_29 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.128.1 | 5.14.21-150400.24.128.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.128.1.150400.24.62.1 | 5.14.21-150400.24.128.1.150400.24.62.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-rt | before 5.14.21-150400.15.88.1 | 5.14.21-150400.15.88.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source-rt | before 5.14.21-150400.15.88.1 | 5.14.21-150400.15.88.1 |
| SUSE:Linux Enterprise Server 15 SP4-LTSS | kernel-zfcpdump | before 5.14.21-150400.24.128.1 | 5.14.21-150400.24.128.1 |
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-2021-47585Jun 19, 2024 · btrfs: fix memory leak in __add_inode_ref()22Monitor
- ← EarlierCVE-2021-47586Jun 19, 2024 · net: stmmac: dwmac-rk: fix oob read in rk_gmac_setup22Monitor
- Later →CVE-2021-47588Jun 19, 2024 · sit: do not call ipip6_dev_free() from sit_init_net()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 / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 595a684fa6f23b21958379a18cfa83862c73c2e1 | Vendor (CNA) |
| Linux Linux | 6e1011cd183faae8daff275c72444edcdfe0d473 | Vendor (CNA) |
| Linux Linux | 8b8e6e782456f1ce02a7ae914bbd5b1053f0b034 | Vendor (CNA) |
| Linux Linux | 8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c | Vendor (CNA) |
| Linux Linux | c675256a7f131f5ba3f331efb715e8f31ea0e392 | Vendor (CNA) |
| Linux Linux | de57f62f76450b934de8203711bdc4f7953c3421 | Vendor (CNA) |
| Linux Linux | eb4687c7442942e115420a30185f8d83faf37696 | Vendor (CNA) |
| Linux Linux | f3fde37d3f0d429f0fcce214cb52588a9e21260e | Vendor (CNA) |
| debian:linux | 5.15.15-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150400.24.128.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.128.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.128.1.150400.24.62.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150400.24.128.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_29 | 1-150400.9.3.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150400.24.128.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150400.15.88.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150400.24.128.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150400.15.88.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150400.24.128.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150400.24.128.1 · SUSE:Linux Enterprise Server 15 SP4-LTSS | 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.
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.
- TR-24-0733 · Jun 24, 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-667 · Improper LockingCVSS 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.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/6e1011cd183faae8daff275c72444edcdfe0d473
- git.kernel.org/stable/c/8b8e6e782456f1ce02a7ae914bbd5b1053f0b034
- git.kernel.org/stable/c/8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c
- git.kernel.org/stable/c/c675256a7f131f5ba3f331efb715e8f31ea0e392
- git.kernel.org/stable/c/de57f62f76450b934de8203711bdc4f7953c3421
- git.kernel.org/stable/c/eb4687c7442942e115420a30185f8d83faf37696
- git.kernel.org/stable/c/f3fde37d3f0d429f0fcce214cb52588a9e21260e
Vendor advisories and official records. Exploit/PoC links are deliberately left out.