GHSA-8376-779w-5hcf · Severity: medium — In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject...
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject mismatching sum of field_len with set key length The field length description provides the length of each separated key field in the concatenation, each field gets rounded up to 32-bits to calculate the pipapo rule width from pipapo_init(). The set key length provides the total size of the key aligned to 32-bits. Register-based arithmetics still allows for combining mismatching set key length and field length description, eg. set key length 10 and field description [ 5, 4 ] leading to pipapo width of 12.
Conclusion & alert: CVE-2025-21826 is rated Low Risk (26.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-14 | 0.05% | 0.04% | -0.01% |
| 2 | 2025-11-18 | 0.04% | 0.05% | +0.01% |
| 3 | 2025-10-31 | — | 0.04% | — |
Full EPSS history (5 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.5 | 3.1 | MEDIUM |
|
1.8 | 3.6 | [email protected] |
GHSA-8376-779w-5hcf · Severity: medium — In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject...
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2025-21826 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. | https://security-tracker.debian.org/tracker/CVE-2025-21826 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-21826 |
suse
|
medium | CVE-2025-21826 severity moderate: SUSE including 52 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 293 product×package rows across 54 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Availability Extension 12 SP5, … (54 product lines)): Known Not Affected 267, Fixed 26. | https://www.suse.com/security/cve/CVE-2025-21826/ |
ubuntu
|
medium | CVE-2025-21826 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, released 168, ignored 148, not-affected 89, needed 1. | https://ubuntu.com/security/CVE-2025-21826 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| linux | linux_kernel | >= 5.10.209, < 5.10.235 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 5.15.148, < 5.15.179 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.1.75, < 6.1.129 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.6.14, < 6.6.76 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.7.2, < 6.12.13 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.13, < 6.13.2 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |