fuse: re-lock request before returning from fuse_ref_folio()
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
fuse: re-lock request before returning from fuse_ref_folio()
fuse_ref_folio() unlocks the request but does not re-lock it before
returning. fuse_chan_abort() can end the request and the async end
callback (eg fuse_writepage_free()) can free the args while the
subsequent copy chain logic after fuse_ref_folio() accesses them,
leading to use-after-free issues.
Fix this by locking the request in fuse_ref_folio() before returning.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122bhttps://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7ahttps://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be