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CVE-2026-89604— efivarfs: Rate limit statfs() handler

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于efivarfs的statfs()处理程序未进行速率限制，可能导致非特权用户在efivarfs挂载点触发大量QueryVariableInfo()运行时服务调用，造成拒绝服务。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 15

VendorProduct Version RangeStatus
Linux Linux 115409cbb6a296d73702a62c54c5b1b11cb88b3d< 97d71ebee48cd1b29091762b3e5cca4f815dd84c affected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237< 3cd611c9f1dbcc116c8af5112e3c1783c8cde2ae affected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237< 8953bdd1b9c0e748d5408d3d0b8e7aeee5c9cd41 affected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237< 92895a14329cc9533e2a74a265214f690ba3851a affected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237< 0dbc2e94b81df5a1264068b6ed3605c654b8afcb affected
d86ff3333cb1d5f42d8898fb5fdb304e143c0237< b2326338dc683e8c1067c0cbf7a47986c4190902 affected
6.1.178< 6.1.188 affected
6.5 affected
… +7 more rows
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I. Basic Information for CVE-2026-89604

Vulnerability Information
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Vulnerability Title
efivarfs: Rate limit statfs() handler
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于efivarfs的statfs()处理程序未进行速率限制，可能导致非特权用户在efivarfs挂载点触发大量QueryVariableInfo()运行时服务调用，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 115409cbb6a296d73702a62c54c5b1b11cb88b3d ~ 97d71ebee48cd1b29091762b3e5cca4f815dd84c -
Linux Linux 6.5 -

II. Public POCs for CVE-2026-89604

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III. Intelligence Information for CVE-2026-89604

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Patches & Fixes for CVE-2026-89604 (6)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89604

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