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CVE-2026-89609— ecryptfs: hold msg ctx list lock when cleaning daemon queue

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 7.3-rc1之前版本存在安全漏洞，该漏洞源于ecryptfs_exorcise_daemon()在清理守护进程队列时未持有ecryptfs_msg_ctx_lists_mux锁，可能导致与全局msg ctx列表用户发生竞争条件。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f66e883eb6186bc43a79581b67aff7d1a69d0ff1< 64d8998e36cfd2bb7114f3af0aa51c5a559a39b3 affected
f66e883eb6186bc43a79581b67aff7d1a69d0ff1< 4d50b8aea11ad9594c8704a4c647e11311ab7b19 affected
f66e883eb6186bc43a79581b67aff7d1a69d0ff1< 956541efd125a10442f9514668bc5c852702c93b affected
f66e883eb6186bc43a79581b67aff7d1a69d0ff1< ec1627bcb5b51ddd46b1ef27a9d5a9834abb0a6a affected
f66e883eb6186bc43a79581b67aff7d1a69d0ff1< 7e48afafe7abc275f7b6916613bb18b821e7d94a affected
f66e883eb6186bc43a79581b67aff7d1a69d0ff1< 0d9636ecba34bd553ecf19049f7705505aea62fd affected
f66e883eb6186bc43a79581b67aff7d1a69d0ff1< 4c02acbe0a2692ca9991c51e62bbe6d6b59dac31 affected
f66e883eb6186bc43a79581b67aff7d1a69d0ff1< 779972513c2fa8c7938e54976f686091dafff22f affected
… +10 more rows
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I. Basic Information for CVE-2026-89609

Vulnerability Information
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Vulnerability Title
ecryptfs: hold msg ctx list lock when cleaning daemon queue
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: hold msg ctx list lock when cleaning daemon queue ecryptfs_exorcise_daemon() drops queued messages from a dying daemon without holding ecryptfs_msg_ctx_lists_mux, but ecryptfs_msg_ctx_alloc_to_free() requires that lock. Take the list lock while moving the queued contexts back to the free list to avoid racing with other global msg ctx list users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 7.3-rc1之前版本存在安全漏洞，该漏洞源于ecryptfs_exorcise_daemon()在清理守护进程队列时未持有ecryptfs_msg_ctx_lists_mux锁，可能导致与全局msg ctx列表用户发生竞争条件。
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 f66e883eb6186bc43a79581b67aff7d1a69d0ff1 ~ 64d8998e36cfd2bb7114f3af0aa51c5a559a39b3 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-89609

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III. Intelligence Information for CVE-2026-89609

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Patches & Fixes for CVE-2026-89609 (8)

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-2026-89609

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