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CVE-2026-90140— cuse: wait for pending RCU callbacks on module exit

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.

在 Linux 内核中，以下漏洞已得到修复： cuse：在模块退出时等待待处理的 RCU 回调 自提交 053fc4f755ad（"fuse: fix UAF in rcu pathwalks"）之后， 通过 而非同步方式释放 。对于 cuse 而言， 指向 ，该函数位于 cuse 模块中。如果在 RCU 宽限期结束之前卸载模块，回调将跳转到已释放的模块内存： 被释放的模块文本段通过 取消映射，因此跳转到过期的回调会触发页错误（page-fault）Oops。如果该虚拟地址随后被重新分配，回调可能会执行无关代码（导

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1027 · Obfuscated Files or Information

Affected Version Matrix 19

VendorProduct Version RangeStatus
Linux Linux bfbab62ca69f72bcd14ea30de1fb98f6080ad464< 7fe415e1cd8fa875be263670c0ab47109818abb6 affected
a8f650b93e55764ca9ff8e1ddebc151f57024086< 45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e affected
535e9bd0e8f8d8cfdc29de7cdb902b5041427fe6< ac5c499413385cea3e0220d6050408d50842891d affected
053fc4f755ad43cf35210677bcba798ccdc48d0c< a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9 affected
053fc4f755ad43cf35210677bcba798ccdc48d0c< 389bd349ddbcf90dbd8a4f2a4ab6e552d53df134 affected
053fc4f755ad43cf35210677bcba798ccdc48d0c< c40f3f24839f8404325a2099e26c2a04786ae309 affected
053fc4f755ad43cf35210677bcba798ccdc48d0c< 4deb3edead0c0e172cc7349e8855d741d3c5e162 affected
5.15.166< 5.15.221 affected
… +11 more rows
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I. Basic Information for CVE-2026-90140

Vulnerability Information
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Vulnerability Title
cuse: wait for pending RCU callbacks on module exit
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cuse: wait for pending RCU callbacks on module exit Since commit 053fc4f755ad ("fuse: fix UAF in rcu pathwalks"), fuse_conn_put() frees the fuse_conn through call_rcu() rather than synchronously. For cuse, fc->release is cuse_fc_release(), which lives in the cuse module. If the module is removed before the RCU grace period ends, the callback jumps into freed module memory: userspace / module unload | RCU softirq ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ close(/dev/cuse) | cuse_channel_release() | fuse_dev_release() | fuse_conn_put(fch->conn) | call_rcu(delayed_release) ------+---> callback queued | rmmod cuse | cuse_exit() | cuse_channel_destroy() | ... | return | | <module text freed> | | rcu_do_batch() | delayed_release() | fc->release() | -> cuse_fc_release() | ^^^ freed text! The freed module text is unmapped by vfree(), so the jump into the stale callback triggers a page-fault Oops. If the virtual address is subsequently reused, the callback could execute unrelated code (undefined behaviour). Fix this by calling rcu_barrier() in cuse_exit() so that any pending fuse_conn release callback completes before the module is removed.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux bfbab62ca69f72bcd14ea30de1fb98f6080ad464 ~ 7fe415e1cd8fa875be263670c0ab47109818abb6 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-90140

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III. Intelligence Information for CVE-2026-90140

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Patches & Fixes for CVE-2026-90140 (7)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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