efivarfs: Rate limit statfs() handler
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 115409cbb6a296d73702a62c54c5b1b11cb88b3d · fixed in 97d71ebee48cd1b29091762b3e5cca4f815dd84c; From d86ff3333cb1d5f42d8898fb5fdb304e143c0237 · fixed in 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae; From d86ff3333cb1d5f42d8898fb5fdb304e143c0237 · fixed in 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41; From d86ff3333cb1d5f42d8898fb5fdb304e143c0237 · fixed in 92895a14329cc9533e2a74a265214f690ba3851a; From d86ff3333cb1d5f42d8898fb5fdb304e143c0237 · fixed in 0dbc2e94b81df5a1264068b6ed3605c654b8afcb; From d86ff3333cb1d5f42d8898fb5fdb304e143c0237 · fixed in b2326338dc683e8c1067c0cbf7a47986c4190902; From 6.1.178 · fixed in 6.1.188
- Linux Linux
6.5
- KernelLinux
fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.5.0 · fixed in 6.12.109; From 6.7.0 · fixed in 6.18.50; From 6.13.0 · fixed in 7.2.4