CVE-2024-47809dlm: fix possible lkb_resource null dereference
- 5.5MediumCVSS base score
- 0.24%Exploitation in 30 daysEPSS · top 84% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 2 days later
· 2 days later
Published
- 22 months later
· 22 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 84% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 – < e1ffea6bec96d4349dbfcc42ad3e436259f64243
- affected 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 – < 8d55ce46dd543c6965970ce70c22c3076dd35b1e
- affected 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 – < 6fbdc3980b70e9c1c86eccea7d5ee68108008fa7
- affected 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 – < 2db11504ef82a60c1a2063ba7431a5cd013ecfcb
- affected 43279e5376017c40b4be9af5bc79cbb4ef6f53d7 – < b98333c67daf887c724cd692e88e2db9418c0861
- affected 2.6.30
- unaffected < 2.6.30
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.66 – ≤ 6.6.*
- unaffected 6.12.5 – ≤ 6.12.*
- unaffected 6.13 – ≤ *
References
References9
- https://git.kernel.org/stable/c/e1ffea6bec96d4349dbfcc42ad3e436259f64243 (opens in a new tab)
- https://git.kernel.org/stable/c/8d55ce46dd543c6965970ce70c22c3076dd35b1e (opens in a new tab)
- https://git.kernel.org/stable/c/6fbdc3980b70e9c1c86eccea7d5ee68108008fa7 (opens in a new tab)
- https://git.kernel.org/stable/c/2db11504ef82a60c1a2063ba7431a5cd013ecfcb (opens in a new tab)
- https://git.kernel.org/stable/c/b98333c67daf887c724cd692e88e2db9418c0861 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-42879 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-47809)Record last updated .