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CVE-2026-53168— fuse: reject fuse_notify() pagecache ops on directories

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.20版本存在安全漏洞，该漏洞源于fuse驱动未正确处理目录的FUSE_NOTIFY_STORE和FUSE_NOTIFY_RETRIEVE操作，可能导致内核内部缓存被用户空间直接访问。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< 15487f98863dc7156ed43c5be26d478beb82ba35 affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< bd23fa0c16c5c86e5b7713224ffbb87d9db81cca affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< 9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6 affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< dd92773d4d9cea010474eb08a5133c14ff6ab53a affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< 99c317d7f8b7bbf3de16d20a01f363e390114cea affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< 12df4cfa738aefff21756728e91056d7defb0fe6 affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< e692f0cb86204dcdb9dddc0b355407eda6394a67 affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0< 9c954499d43aefac01c5dfb57a82b13d2dcf4b94 affected
… +10 more rows
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I. Basic Information for CVE-2026-53168

Vulnerability Information
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Vulnerability Title
fuse: reject fuse_notify() pagecache ops on directories
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fuse: reject fuse_notify() pagecache ops on directories The operations FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE allow the FUSE daemon to actively write/read pagecache contents. For directories with FOPEN_CACHE_DIR, the pagecache is used as kernel-internal cache storage, and userspace is not supposed to have direct access to this cache - in particular, fuse_parse_cache() will hit WARN_ON() if the cache contains bogus data. Reject FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE on anything other than regular files with -EINVAL.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.20版本存在安全漏洞，该漏洞源于fuse驱动未正确处理目录的FUSE_NOTIFY_STORE和FUSE_NOTIFY_RETRIEVE操作，可能导致内核内部缓存被用户空间直接访问。
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 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 ~ 15487f98863dc7156ed43c5be26d478beb82ba35 -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-53168

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III. Intelligence Information for CVE-2026-53168

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Patches & Fixes for CVE-2026-53168 (8)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53200 8.8 HIGH KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
CVE-2026-53198 8.8 HIGH ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53168

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