CVE-2021-47183: scsi: lpfc: Fix link down processing to address NULL pointer dereference
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: 0.33% (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 04c1af683270e4709a594bb1691b8800b945035a, 1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6, 28de48a7cea495ab48082d9ff4ef63f7cb4e563a.
- Severity is disputed: the assigning authority (CNA) scores it 8.8, NVD 5.5.
- Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 04c1af683270e4709a594bb1691b8800b945035a, 1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6, 28de48a7cea495ab48082d9ff4ef63f7cb4e563a 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: lpfc: Fix link down processing to address NULL pointer dereference If an FC link down transition while PLOGIs are outstanding to fabric well known addresses, outstanding ABTS requests may result in a NULL pointer dereference. Driver unload requests may hang with repeated "2878" log messages. The Link down processing results in ABTS requests for outstanding ELS requests. The Abort WQEs are sent for the ELSs before the driver had set the link state to down. Thus the driver is sending the Abort with the expectation that an ABTS will be sent on the wire. The Abort request is stalled waiting for the link to come up. In some conditions the driver may auto-complete the ELSs thus if the link does come up, the Abort completions may reference an invalid structure. Fix by ensuring that Abort set the flag to avoid link traffic if issued due to conditions where the link failed.
- Published
- Apr 10, 2024
- Updated
- Aug 5, 2026
- EPSS
- 0.3% · 27th percentile
- CWE
- CWE-476
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 · 0.3%
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
- 8.8
- 3.3 point gap
CVSS:3.1/AV:A/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 kernelbefore 5.15.5
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
- 2.6.38affected
- 70f3c073362ef7b5e55c92b83eb2dd9a7fb4e9bf and later · before 04c1af683270e4709a594bb1691b8800b945035aaffected · git
- 70f3c073362ef7b5e55c92b83eb2dd9a7fb4e9bf and later · before 28de48a7cea495ab48082d9ff4ef63f7cb4e563aaffected · git
- 70f3c073362ef7b5e55c92b83eb2dd9a7fb4e9bf and later · before 1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6affected · git
- before 2.6.38not affected · semver
- 5.10.241 and later · up to and including 5.10.*not affected · semver
- 5.15.5 and later · up to and including 5.15.*not affected · semver
- 5.16 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:11 | linux | before 5.10.244-1 | 5.10.244-1 |
| Debian:12 | linux | before 5.15.5-1 | 5.15.5-1 |
| openSUSE:Leap 15.5 | dtb-aarch64 | before 5.14.21-150500.55.62.1 | 5.14.21-150500.55.62.1 |
| openSUSE:Leap 15.5 | kernel-64kb | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap 15.5 | kernel-debug | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap 15.5 | kernel-default | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap 15.5 | kernel-default-base | before 5.14.21-150500.55.62.2.150500.6.27.2 | 5.14.21-150500.55.62.2.150500.6.27.2 |
| openSUSE:Leap 15.5 | kernel-docs | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap 15.5 | kernel-kvmsmall | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap 15.5 | kernel-obs-build | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap 15.5 | kernel-obs-qa | before 5.14.21-150500.55.62.1 | 5.14.21-150500.55.62.1 |
| openSUSE:Leap 15.5 | kernel-rt | before 5.14.21-150500.13.52.1 | 5.14.21-150500.13.52.1 |
| openSUSE:Leap 15.5 | kernel-rt_debug | before 5.14.21-150500.13.52.1 | 5.14.21-150500.13.52.1 |
| openSUSE:Leap 15.5 | kernel-source | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap 15.5 | kernel-source-rt | before 5.14.21-150500.13.52.1 | 5.14.21-150500.13.52.1 |
| openSUSE:Leap 15.5 | kernel-syms | before 5.14.21-150500.55.62.1 | 5.14.21-150500.55.62.1 |
| openSUSE:Leap 15.5 | kernel-syms-rt | before 5.14.21-150500.13.52.1 | 5.14.21-150500.13.52.1 |
| openSUSE:Leap 15.5 | kernel-zfcpdump | before 5.14.21-150500.55.62.2 | 5.14.21-150500.55.62.2 |
| openSUSE:Leap Micro 5.3 | kernel-default | before 5.14.21-150400.24.119.1 | 5.14.21-150400.24.119.1 |
| openSUSE:Leap Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.119.1.150400.24.56.1 | 5.14.21-150400.24.119.1.150400.24.56.1 |
| openSUSE:Leap Micro 5.3 | kernel-rt | before 5.14.21-150400.15.79.1 | 5.14.21-150400.15.79.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.119.1 | 5.14.21-150400.24.119.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.119.1 | 5.14.21-150400.24.119.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.119.1 | 5.14.21-150400.24.119.1 |
+22
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-2021-47181Apr 10, 2024 · usb: musb: tusb6010: check return value after calling platform_get_resource()22Monitor
- ← EarlierCVE-2021-47182Apr 10, 2024 · scsi: core: Fix scsi_mode_sense() buffer length handling22Monitor
- Later →CVE-2021-47184Apr 10, 2024 · i40e: Fix NULL ptr dereference on VSI filter sync22Monitor
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 | 04c1af683270e4709a594bb1691b8800b945035a | Vendor (CNA) |
| Linux Linux | 1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6 | Vendor (CNA) |
| Linux Linux | 28de48a7cea495ab48082d9ff4ef63f7cb4e563a | Vendor (CNA) |
| debian:linux | 5.15.5-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 5.14.21-150500.55.62.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-64kb | 5.14.21-150500.55.62.2 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-debug | 5.14.21-150500.55.62.2 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-default | 5.14.21-150400.24.119.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:kernel-default-base | 5.14.21-150400.24.119.1.150400.24.56.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:kernel-docs | 5.14.21-150500.55.62.2 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 5.14.21-150500.55.62.2 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-obs-build | 5.14.21-150500.55.62.2 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 5.14.21-150500.55.62.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-rt | 5.14.21-150400.15.79.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:kernel-source | 5.14.21-150500.55.62.2 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:kernel-syms | 5.14.21-150500.55.62.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150400.24.119.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.119.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.119.1.150400.24.56.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150400.24.119.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_26 | 1-150400.9.3.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_13 | 1-150500.11.3.2 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150400.24.119.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150400.15.79.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150400.24.119.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150400.15.79.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150400.24.119.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150400.24.119.1 · 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-24-0494 · May 16, 2024(Linux Kernel Güncellemesi)
- TR-24-0284 · Apr 15, 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-476 · NULL Pointer DereferenceCVSS 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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (3 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.