cuse: wait for pending RCU callbacks on module exit

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Summary

CVECVE-2026-90140
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:06 UTC
Updated2026-09-17 17:17:06 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bfbab62ca69f72bcd14ea30de1fb98f6080ad464 7fe415e1cd8fa875be263670c0ab47109818abb6 git Not specified
CNA Linux Linux affected a8f650b93e55764ca9ff8e1ddebc151f57024086 45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e git Not specified
CNA Linux Linux affected 535e9bd0e8f8d8cfdc29de7cdb902b5041427fe6 ac5c499413385cea3e0220d6050408d50842891d git Not specified
CNA Linux Linux affected 053fc4f755ad43cf35210677bcba798ccdc48d0c a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9 git Not specified
CNA Linux Linux affected 053fc4f755ad43cf35210677bcba798ccdc48d0c 389bd349ddbcf90dbd8a4f2a4ab6e552d53df134 git Not specified
CNA Linux Linux affected 053fc4f755ad43cf35210677bcba798ccdc48d0c c40f3f24839f8404325a2099e26c2a04786ae309 git Not specified
CNA Linux Linux affected 053fc4f755ad43cf35210677bcba798ccdc48d0c 4deb3edead0c0e172cc7349e8855d741d3c5e162 git Not specified
CNA Linux Linux affected 5.15.166 5.15.221 semver Not specified
CNA Linux Linux affected 6.1.107 6.1.188 semver Not specified
CNA Linux Linux affected 6.6.48 6.6.157 semver Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c40f3f24839f8404325a2099e26c2a04786ae309 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4deb3edead0c0e172cc7349e8855d741d3c5e162 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/389bd349ddbcf90dbd8a4f2a4ab6e552d53df134 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7fe415e1cd8fa875be263670c0ab47109818abb6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ac5c499413385cea3e0220d6050408d50842891d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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