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CVE-2026-46040— inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails

AI Predicted 5.3 Difficulty: Moderate EPSS 0.03% · P10

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux1cce1eea0aff51201753fcaca421df825b0813b6< 3ab58cf42c46bf2366d2f55ae5c59299d5e178b7affected
1cce1eea0aff51201753fcaca421df825b0813b6< 10edf7e0ffdc7faa18e2244b17722c1b882b8273affected
1cce1eea0aff51201753fcaca421df825b0813b6< 3ad9ccea1b25435f6179b57aa891960beb7ce8f9affected
1cce1eea0aff51201753fcaca421df825b0813b6< 8bcc1cd237ab5ccfdd102869fa031c541943cf40affected
1cce1eea0aff51201753fcaca421df825b0813b6< 73ddc8518a32baff6bc17afda4ee1ebae5b4ed12affected
1cce1eea0aff51201753fcaca421df825b0813b6< fdaa42ca370d056428e5e171247c8fdce8dff36aaffected
1cce1eea0aff51201753fcaca421df825b0813b6< 9e48844f708eb48bae4e79cb21edc097c966306daffected
1cce1eea0aff51201753fcaca421df825b0813b6< 6a320935fa4293e9e599ec9f85dc9eb3be7029f8affected
… +10 more rows
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I. Basic Information for CVE-2026-46040

Vulnerability Information
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Vulnerability Title
inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails When fsnotify_add_inode_mark_locked() fails in inotify_new_watch(), the error path calls inotify_remove_from_idr() but does not call dec_inotify_watches() to undo the preceding inc_inotify_watches(). This leaks a watch count, and repeated failures can exhaust the max_user_watches limit with -ENOSPC even when no watches are active. Prior to commit 1cce1eea0aff ("inotify: Convert to using per-namespace limits"), the watch count was incremented after fsnotify_add_mark_locked() succeeded, so this path was not affected. The conversion moved inc_inotify_watches() before the mark insertion without adding the corresponding rollback. Add the missing dec_inotify_watches() call in the error path.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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inotify_new_watch函数中fsnotify_add_inode_mark_locked失败时未减少监视计数，可能导致监视计数泄漏。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 1cce1eea0aff51201753fcaca421df825b0813b6 ~ 3ab58cf42c46bf2366d2f55ae5c59299d5e178b7 -
LinuxLinux 4.11 -

II. Public POCs for CVE-2026-46040

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III. Intelligence Information for CVE-2026-46040

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Patches & Fixes for CVE-2026-46040 (8)

Same Patch Batch · Linux · 2026-05-27 · 276 CVEs total

CVE-2026-459729.8 CRITICALsmb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-458989.8 CRITICALRDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-459889.8 CRITICALrxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-460399.8 CRITICALrxgk: Fix potential integer overflow in length check
CVE-2026-460439.1 CRITICALRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-459458.8 HIGHiommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-460568.8 HIGHBluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-460378.2 HIGHipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-458438.2 HIGHslip: bound decode() reads against the compressed packet length
CVE-2026-460998.1 HIGHnet: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-460108.1 HIGHrxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-460767.9 HIGHKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-459707.8 HIGHbonding: alb: fix UAF in rlb_arp_recv during bond up/down
CVE-2026-459807.8 HIGHaccel/amdxdna: Stop job scheduling across aie2_release_resource()
CVE-2026-459317.8 HIGHaccel/amdxdna: Hold mm structure across iommu_sva_unbind_device()
CVE-2026-460537.8 HIGHnet: rds: fix MR cleanup on copy error
CVE-2026-459297.8 HIGHovpn: fix possible use-after-free in ovpn_net_xmit
CVE-2026-458527.8 HIGHRDMA/rxe: Fix double free in rxe_srq_from_init
CVE-2026-458787.8 HIGHdrm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-460587.8 HIGHmedia: amphion: Fix race between m2m job_abort and device_run

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46040

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