CVE-2026-74564
HIGH 7.1 ALL-YEARSIn the Linux kernel, the following vulnerability has been resolved: netfilter: xt_hashlimit: validate hashtable supports XT_HASHLIMIT_RATE_MATCH The XT_HASHLIMIT_RATE_MATCH flag mode changes the semantics of the dsthash_ent structure which represents an entry in the hashtable. There is a union area which uses a different layout to express the rate match mode. Update .checkentry path to validate the XT_HASHLIMIT_RATE_MATCH mode flag is requested by two or more different rules that refer to the same hashtable. Otherwise, uninitialized access to the burst field in the union is possible. Reject the use of the XT_HASHLIMIT_RATE_MATCH mode flag if set on by revision less than 3 too.
Severe if exploited (CVSS 7.1), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
0.1%chance of exploitation in 30 days · 2nd percentile
Impact if exploited
7.1CVSS 3.1 · HIGH · CNA
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityNone
What an attacker needs
- ⚠Access: Requires local access to the host
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Weakness (CWE)
Not classified.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References and research data (JSON)
All CVSS metrics
- HIGH 7.1 v3.1 · CNA Primary
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - HIGH 7.1 v3.1 · NVD Secondary
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-59629 EUVD · EUVD-2026-59629
Technical & other
- https://git.kernel.org/stable/c/402befce5854c195058cf4bab7c78ca286068a26CVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793 - https://git.kernel.org/stable/c/dee686b5e7f21180538ff719867702f411c8eb5cCVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793 - https://git.kernel.org/stable/c/f76ab783e7d8d33e33dd7dfa697297f70d57b0e8CVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793 - https://git.kernel.org/stable/c/24683fea1f06bd3bd2707b99460e859bc6464c22CVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793 - https://git.kernel.org/stable/c/32ec8d4aba2cf22e12bdc28df8c4bd833c195fc0CVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793 - https://git.kernel.org/stable/c/d186f77d18bdfb252d401ff992ca3001a6a65a0fCVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793 - https://git.kernel.org/stable/c/06a76334243ccd875a981aa8bb46c0f931ef1e3bCVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793 - https://git.kernel.org/stable/c/305b63e1402267459fdabb183af4527f6799eebfCVE record · Linux · Updated 2026-08-19T16:39:04.869Z
NVD · CVE-2026-74564 · Updated 2026-10-16T20:17:37.793
Sources: NVD · CVE.org · All sources and attribution · EPSS