CVE-2024-47809: dlm: fix possible lkb_resource null 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: 0.24% (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 2db11504ef82a60c1a2063ba7431a5cd013ecfcb, 6fbdc3980b70e9c1c86eccea7d5ee68108008fa7, 8d55ce46dd543c6965970ce70c22c3076dd35b1e; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.76.1-1; azl3 kernel 6.6.76.1-1 on Azure Linux 3.0 6.6.76.1-1.
Low priority for now. Upgrade to Linux Linux 2db11504ef82a60c1a2063ba7431a5cd013ecfcb, 6fbdc3980b70e9c1c86eccea7d5ee68108008fa7, 8d55ce46dd543c6965970ce70c22c3076dd35b1e; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.76.1-1; azl3 kernel 6.6.76.1-1 on Azure Linux 3.0 6.6.76.1-1 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: dlm: fix possible lkb_resource null dereference This patch fixes a possible null pointer dereference when this function is called from request_lock() as lkb->lkb_resource is not assigned yet, only after validate_lock_args() by calling attach_lkb(). Another issue is that a resource name could be a non printable bytearray and we cannot assume to be ASCII coded. The log functionality is probably never being hit when DLM is used in normal way and no debug logging is enabled. The null pointer dereference can only occur on a new created lkb that does not have the resource assigned yet, it probably never hits the null pointer dereference but we should be sure that other changes might not change this behaviour and we actually can hit the mentioned null pointer dereference. In this patch we just drop the printout of the resource name, the lkb id is enough to make a possible connection to a resource name if this exists.
- Published
- Jan 11, 2025
- Updated
- Oct 15, 2026
- EPSS
- 0.2% · 15th 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 · 0.2%
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
- 5.5
- 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.
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 6.6.66
- linux linux kernel6.7 and later · before 6.12.5
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
- 2.6.30affected
- 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 and later · before e1ffea6bec96d4349dbfcc42ad3e436259f64243affected · git
- 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 and later · before 8d55ce46dd543c6965970ce70c22c3076dd35b1eaffected · git
- 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 and later · before 6fbdc3980b70e9c1c86eccea7d5ee68108008fa7affected · git
- 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 and later · before 2db11504ef82a60c1a2063ba7431a5cd013ecfcbaffected · git
- 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 and later · before b98333c67daf887c724cd692e88e2db9418c0861affected · git
- before 2.6.30not affected · semver
- 5.15.209 and later · up to and including 5.15.*not affected · semver
- 6.1.167 and later · up to and including 6.1.*not affected · semver
- 6.6.66 and later · up to and including 6.6.*not 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 6.1.170-1 | 6.1.170-1 |
| Debian:13 | linux | before 6.12.5-1 | 6.12.5-1 |
| openSUSE:Leap 15.6 | dtb-aarch64 | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-64kb | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-azure | before 6.4.0-150600.8.26.1 | 6.4.0-150600.8.26.1 |
| openSUSE:Leap 15.6 | kernel-debug | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-default | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-default-base | before 6.4.0-150600.23.38.1.150600.12.16.2 | 6.4.0-150600.23.38.1.150600.12.16.2 |
| openSUSE:Leap 15.6 | kernel-docs | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-kvmsmall | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-obs-build | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-obs-qa | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-rt | before 6.4.0-150600.10.26.1 | 6.4.0-150600.10.26.1 |
| openSUSE:Leap 15.6 | kernel-rt_debug | before 6.4.0-150600.10.26.1 | 6.4.0-150600.10.26.1 |
| openSUSE:Leap 15.6 | kernel-source | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-source-azure | before 6.4.0-150600.8.26.1 | 6.4.0-150600.8.26.1 |
| openSUSE:Leap 15.6 | kernel-source-rt | before 6.4.0-150600.10.26.1 | 6.4.0-150600.10.26.1 |
| openSUSE:Leap 15.6 | kernel-syms | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| openSUSE:Leap 15.6 | kernel-syms-azure | before 6.4.0-150600.8.26.1 | 6.4.0-150600.8.26.1 |
| openSUSE:Leap 15.6 | kernel-syms-rt | before 6.4.0-150600.10.26.1 | 6.4.0-150600.10.26.1 |
| openSUSE:Leap 15.6 | kernel-zfcpdump | before 6.4.0-150600.23.38.1 | 6.4.0-150600.23.38.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kernel-default | before 4.12.14-122.247.1 | 4.12.14-122.247.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_65 | before 1-8.3.1 | 1-8.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_8 | before 1-150600.13.3.2 | 1-150600.13.3.2 |
+23
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-2024-47408Jan 11, 2025 · net/smc: check smcd_v2_ext_offset when receiving proposal msg22Monitor
- ← EarlierCVE-2024-47794Jan 11, 2025 · bpf: Prevent tailcall infinite loop caused by freplace22Monitor
- Later →CVE-2024-48881Jan 11, 2025 · bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again22Monitor
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 | 2db11504ef82a60c1a2063ba7431a5cd013ecfcb | Vendor (CNA) |
| Linux Linux | 6fbdc3980b70e9c1c86eccea7d5ee68108008fa7 | Vendor (CNA) |
| Linux Linux | 8d55ce46dd543c6965970ce70c22c3076dd35b1e | Vendor (CNA) |
| Linux Linux | b98333c67daf887c724cd692e88e2db9418c0861 | Vendor (CNA) |
| Linux Linux | e1ffea6bec96d4349dbfcc42ad3e436259f64243 | Vendor (CNA) |
| azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 | 6.6.76.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 kernel 6.6.76.1-1 on Azure Linux 3.0 | 6.6.76.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.170-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-azure | 6.4.0-150600.8.26.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-debug | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-default | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-default-base | 6.4.0-150600.23.38.1.150600.12.16.2 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-docs | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-obs-build | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 6.4.0-150600.23.38.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-source-azure | 6.4.0-150600.8.26.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-syms-azure | 6.4.0-150600.8.26.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.38.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-azure | 6.4.0-150600.8.26.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | Package registry (OSV) |
| suse:kernel-default | 6.4.0-150600.23.38.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.38.1.150600.12.16.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-docs | 6.4.0-150600.23.38.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_8 | 1-150600.13.3.2 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.38.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-source | 6.4.0-150600.23.38.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-source-azure | 6.4.0-150600.8.26.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | Package registry (OSV) |
| suse:kernel-syms | 6.4.0-150600.23.38.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
+2
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).
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 (8 more)Show less
- git.kernel.org/stable/c/6fbdc3980b70e9c1c86eccea7d5ee68108008fa7
- git.kernel.org/stable/c/8d55ce46dd543c6965970ce70c22c3076dd35b1e
- git.kernel.org/stable/c/b98333c67daf887c724cd692e88e2db9418c0861
- git.kernel.org/stable/c/e1ffea6bec96d4349dbfcc42ad3e436259f64243
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-082556.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.