CVE-2026-43125: dlm: validate length in dlm_search_rsb_tree
Vulnerability summary
CVE-2026-43125 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 45.3% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 32 · Related 20Timeline
- 06-05-2026PublishedVulnerability first disclosed.
- 30-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: dlm: validate length in dlm_search_rsb_tree The len parameter in dlm_dump_rsb_name() is not validated and comes from network messages. When it exceeds DLM_RESNAME_MAXLEN, it can cause out-of-bounds write in dlm_search_rsb_tree(). Add length validation to prevent potential buffer overflow.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.54%
Chance of exploitation in the next 30 days
Percentile
45%
Versus all other CVEs
30-day change
Increase +0.11 pp
From 0.43% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
- CWE-130Improper Handling of Length Parameter InconsistencyThe product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu107 products
- linux< 6.17.0-40.40
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.17.0-1019.19
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 7210cb7a72a22303cdb225bd1aea28697a17bbae, < 0270664871616eb3a5c864b9aa17be76fd35b920 | ≥ 7210cb7a72a22303cdb225bd1aea28697a17bbae, < c98d071a1ca903b705316225e47006aaa20e989c | ≥ 7210cb7a72a22303cdb225bd1aea28697a17bbae, < 2deafd015ea9a0e75ee5764e20eb1e16bd73efd8 | ≥ 7210cb7a72a22303cdb225bd1aea28697a17bbae, < 67288113c5e6cf9e659b4065c0ed6f16100e0c71 | ≥ 7210cb7a72a22303cdb225bd1aea28697a17bbae, < 082083c9fbd99422a0370fe2102144a231c9f5d6 | ≥ 7210cb7a72a22303cdb225bd1aea28697a17bbae, < 5f053a2e7209d326cbbc07738fa6d6893d307438 | ≥ 7210cb7a72a22303cdb225bd1aea28697a17bbae, < 080e5563f878c64e697b89e7439d730d0daad882 | 3.4
- linux_kernel≥ 3.4, < 6.12.75 | ≥ 6.13, < 6.18.16 | ≥ 6.19, < 6.19.6
Debian1 product
- linuxAll versions (No fix recorded) | < 6.12.85-1 | < 6.19.6-1
3 vendors · 110 products
