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CVE-2026-89548— SUNRPC: always drain cache_cleaner before destroying a cache_detail

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 3.4版本至7.3-rc1之前版本存在安全漏洞，该漏洞源于SUNRPC销毁cache_detail之前未排空cache_cleaner，导致缓存清理函数持有悬空指针，可能造成释放后重用。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 820f9442e711a81749e70c40f149fc54c4ce0ca8< dec787a15c96a5665e9ffc61b429a6a4ab26e6b9 affected
820f9442e711a81749e70c40f149fc54c4ce0ca8< 5eea874a696201c31e7c2d7badbfa0d90e9961b5 affected
820f9442e711a81749e70c40f149fc54c4ce0ca8< cf239de7fdcc8336259b01ea4bcf650dadad1040 affected
820f9442e711a81749e70c40f149fc54c4ce0ca8< 6d74ecc2be120a0c300b224b7649fe93c0453714 affected
820f9442e711a81749e70c40f149fc54c4ce0ca8< 9d44836f60c8c29bcdb1471fd9202387c642a890 affected
820f9442e711a81749e70c40f149fc54c4ce0ca8< 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b affected
820f9442e711a81749e70c40f149fc54c4ce0ca8< 3d60fdf951143d6ef4e352e2f8eb852286701726 affected
820f9442e711a81749e70c40f149fc54c4ce0ca8< f42d0fda0c67695db6bc704b04b7c10240805377 affected
… +10 more rows
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I. Basic Information for CVE-2026-89548

Vulnerability Information
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Vulnerability Title
SUNRPC: always drain cache_cleaner before destroying a cache_detail
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: always drain cache_cleaner before destroying a cache_detail sunrpc_destroy_cache_detail() only cancels the global cache_cleaner delayed_work when cache_list is empty. During per-netns teardown cache_list is never empty because init_net's caches remain registered, so the cancel never fires. After unlink, the caller proceeds to cache_destroy_net() which kfrees the cache_detail while cache_clean() may still hold a dangling pointer to it. The result is a use-after-free: cache_dequeue() takes cd->queue_lock on freed memory, and cache_put() dereferences cd->cache_put as a function pointer from freed slab. Drop the list_empty guard so that cancel_delayed_work_sync() always runs, ensuring any in-flight cache_clean() completes before the cache_detail is freed. Re-arm the cleaner afterwards if other caches are still registered.
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 3.4版本至7.3-rc1之前版本存在安全漏洞，该漏洞源于SUNRPC销毁cache_detail之前未排空cache_cleaner，导致缓存清理函数持有悬空指针，可能造成释放后重用。
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 820f9442e711a81749e70c40f149fc54c4ce0ca8 ~ dec787a15c96a5665e9ffc61b429a6a4ab26e6b9 -
Linux Linux 3.4 -

II. Public POCs for CVE-2026-89548

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III. Intelligence Information for CVE-2026-89548

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Patches & Fixes for CVE-2026-89548 (7)

Vendor Advisories for CVE-2026-89548 (1)

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-2026-89548

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