CVE-2026-89604efivarfs: Rate limit statfs() handler
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: efivarfs: Rate limit statfs() handler Ravi reports that statfs() may be called by unprivileged users on the efivarfs mount point, which may result in a flood of calls to the QueryVariableInfo() runtime service. These calls are disproportionately costly on x86 systems where the variable store is backed by SMM, as each SMM entry requires a rendez-vous of all the CPUs. So rate limit the calls to QueryVariableInfo() at twice per second, and return the most recently obtained value for calls that are elided.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 115409cbb6a296d73702a62c54c5b1b11cb88b3d builds before 97d71ebee48cd1b29091762b3e5cca4f815dd84c; from d86ff3333cb1d5f42d8898fb5fdb304e143c0237 before 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae; from d86ff3333cb1d5f42d8898fb5fdb304e143c0237 before 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41; from d86ff3333cb1d5f42d8898fb5fdb304e143c0237 before 92895a14329cc9533e2a74a265214f690ba3851a; from d86ff3333cb1d5f42d8898fb5fdb304e143c0237 before 0dbc2e94b81df5a1264068b6ed3605c654b8afcb; from d86ff3333cb1d5f42d8898fb5fdb304e143c0237 before b2326338dc683e8c1067c0cbf7a47986c4190902; from 6.1.178 before 6.1.188 | CNA record |
References
- https://git.kernel.org/stable/c/97d71ebee48cd1b29091762b3e5cca4f815dd84c
- https://git.kernel.org/stable/c/3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae
- https://git.kernel.org/stable/c/8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41
- https://git.kernel.org/stable/c/92895a14329cc9533e2a74a265214f690ba3851a
- https://git.kernel.org/stable/c/0dbc2e94b81df5a1264068b6ed3605c654b8afcb
- https://git.kernel.org/stable/c/b2326338dc683e8c1067c0cbf7a47986c4190902
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.