CVE-2025-68821— fuse: fix readahead reclaim deadlock
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于fuse中readahead回收死锁问题，可能导致死锁。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 17
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | a39f70d63f4373a598820d9491719e44cd60afe9< cbbf3f1bb9f834bb2acbb61ddca74363456e19cd |
affected |
7d38aa079ed859b73f4460aab89c7619b04963b8< 4703bc0e8cd3409acb1476a70cb5b7ff943cf39a |
affected | ||
c7ec75f3cbf73bd46f479f7d6942585f765715da< cf74785c00b8b1c0c4a9dd74bfa9c22d62e2d99f |
affected | ||
e26ee4efbc79610b20e7abe9d96c87f33dacc1ff< fbba8b00bbe4e4f958a2b0654cc1219a7e6597f6 |
affected | ||
e26ee4efbc79610b20e7abe9d96c87f33dacc1ff< e0d6de83a4cc22bbac72713f3a58121af36cc411 |
affected | ||
e26ee4efbc79610b20e7abe9d96c87f33dacc1ff< bd5603eaae0aabf527bfb3ce1bb07e979ce5bd50 |
affected | ||
5.15.196< 5.15.198 |
affected | ||
6.1.158< 6.1.160 |
affected | ||
| … +9 more rows | |||
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I. Basic Information for CVE-2025-68821
Vulnerability Information
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Vulnerability Title
fuse: fix readahead reclaim deadlock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
fuse: fix readahead reclaim deadlock
Commit e26ee4efbc79 ("fuse: allocate ff->release_args only if release is
needed") skips allocating ff->release_args if the server does not
implement open. However in doing so, fuse_prepare_release() now skips
grabbing the reference on the inode, which makes it possible for an
inode to be evicted from the dcache while there are inflight readahead
requests. This causes a deadlock if the server triggers reclaim while
servicing the readahead request and reclaim attempts to evict the inode
of the file being read ahead. Since the folio is locked during
readahead, when reclaim evicts the fuse inode and fuse_evict_inode()
attempts to remove all folios associated with the inode from the page
cache (truncate_inode_pages_range()), reclaim will block forever waiting
for the lock since readahead cannot relinquish the lock because it is
itself blocked in reclaim:
>>> stack_trace(1504735)
folio_wait_bit_common (mm/filemap.c:1308:4)
folio_lock (./include/linux/pagemap.h:1052:3)
truncate_inode_pages_range (mm/truncate.c:336:10)
fuse_evict_inode (fs/fuse/inode.c:161:2)
evict (fs/inode.c:704:3)
dentry_unlink_inode (fs/dcache.c:412:3)
__dentry_kill (fs/dcache.c:615:3)
shrink_kill (fs/dcache.c:1060:12)
shrink_dentry_list (fs/dcache.c:1087:3)
prune_dcache_sb (fs/dcache.c:1168:2)
super_cache_scan (fs/super.c:221:10)
do_shrink_slab (mm/shrinker.c:435:9)
shrink_slab (mm/shrinker.c:626:10)
shrink_node (mm/vmscan.c:5951:2)
shrink_zones (mm/vmscan.c:6195:3)
do_try_to_free_pages (mm/vmscan.c:6257:3)
do_swap_page (mm/memory.c:4136:11)
handle_pte_fault (mm/memory.c:5562:10)
handle_mm_fault (mm/memory.c:5870:9)
do_user_addr_fault (arch/x86/mm/fault.c:1338:10)
handle_page_fault (arch/x86/mm/fault.c:1481:3)
exc_page_fault (arch/x86/mm/fault.c:1539:2)
asm_exc_page_fault+0x22/0x27
Fix this deadlock by allocating ff->release_args and grabbing the
reference on the inode when preparing the file for release even if the
server does not implement open. The inode reference will be dropped when
the last reference on the fuse file is dropped (see fuse_file_put() ->
fuse_release_end()).
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于fuse中readahead回收死锁问题，可能导致死锁。
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
II. Public POCs for CVE-2025-68821
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2026-01-13 · 93 CVEs total
| CVE-2025-71068 | 9.8 CRITICAL | svcrdma: bound check rq_pages index in inline path |
| CVE-2025-68775 | 9.8 CRITICAL | net/handshake: duplicate handshake cancellations leak socket |
| CVE-2025-68817 | 9.8 CRITICAL | ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency |
| CVE-2025-68794 | 9.8 CRITICAL | iomap: adjust read range correctly for non-block-aligned positions |
| CVE-2025-68811 | 9.8 CRITICAL | svcrdma: use rc_pageoff for memcpy byte offset |
| CVE-2025-68809 | 9.1 CRITICAL | ksmbd: vfs: fix race on m_flags in vfs_cache |
| CVE-2025-71095 | 9.1 CRITICAL | net: stmmac: fix the crash issue for zero copy XDP_TX action |
| CVE-2025-71093 | 9.1 CRITICAL | e1000: fix OOB in e1000_tbi_should_accept() |
| CVE-2025-68818 | 8.8 HIGH | scsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path" |
| CVE-2025-71072 | 8.2 HIGH | shmem: fix recovery on rename failures |
| CVE-2025-68799 | 8.1 HIGH | caif: fix integer underflow in cffrml_receive() |
| CVE-2025-68803 | 8.0 HIGH | NFSD: NFSv4 file creation neglects setting ACL |
| CVE-2025-68819 | 7.8 HIGH | media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100_i2c_msg() |
| CVE-2025-68815 | 7.8 HIGH | net/sched: ets: Remove drr class from the active list if it changes to strict |
| CVE-2025-71066 | 7.8 HIGH | net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change |
| CVE-2025-68822 | 7.8 HIGH | Input: alps - fix use-after-free bugs caused by dev3_register_work |
| CVE-2025-68792 | 7.8 HIGH | tpm2-sessions: Fix out of range indexing in name_size |
| CVE-2025-68793 | 7.8 HIGH | drm/amdgpu: fix a job->pasid access race in gpu recovery |
| CVE-2025-71074 | 7.8 HIGH | functionfs: fix the open/removal races |
| CVE-2025-68795 | 7.8 HIGH | ethtool: Avoid overflowing userspace buffer on stats query |
Showing top 20 of 93 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
Same vendor: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2025-68821
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