cbcvebase.
CVE-2022-48822
published 2024-07-16

CVE-2022-48822: In the Linux kernel, the following vulnerability has been resolved: usb: f_fs: Fix use-after-free for epfile Consider a case where ffs_func_eps_disable is…

PriorityP340high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.27%
19.2th percentile
In the Linux kernel, the following vulnerability has been resolved: usb: f_fs: Fix use-after-free for epfile Consider a case where ffs_func_eps_disable is called from ffs_func_disable as part of composition switch and at the same time ffs_epfile_release get called from userspace. ffs_epfile_release will free up the read buffer and call ffs_data_closed which in turn destroys ffs->epfiles and mark it as NULL. While this was happening the driver has already initialized the local epfile in ffs_func_eps_disable which is now freed and waiting to acquire the spinlock. Once spinlock is acquired the driver proceeds with the stale value of epfile and tries to free the already freed read buffer causing use-after-free. Following is the illustration of the race: CPU1 CPU2 ffs_func_eps_disable epfiles (local copy) ffs_epfile_release ffs_data_closed if (last file closed) ffs_data_reset ffs_data_clear ffs_epfiles_destroy spin_lock dereference epfiles Fix this races by taking epfiles local copy & assigning it under spinlock and if epfiles(local) is null then update it in ffs->epfiles then finally destroy it. Extending the scope further from the race, protecting the ep related structures, and concurrent accesses.

Affected

21 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.16.10-1 (bookworm)linux 5.16.10-1 (bookworm)
linuxlinux——
linuxlinux——
linuxlinux>= 4.8.10 < 4.94.9
linuxlinux>= a9e6f83c2df199187a5248f824f31b6787ae23ae < 32048f4be071f9a6966744243f1786f45bb22dc232048f4be071f9a6966744243f1786f45bb22dc2
linuxlinux>= a9e6f83c2df199187a5248f824f31b6787ae23ae < cfe5f6fd335d882bcc829a1c8a7d462a455c626ecfe5f6fd335d882bcc829a1c8a7d462a455c626e
linuxlinux>= a9e6f83c2df199187a5248f824f31b6787ae23ae < c9fc422c9a43e3d58d246334a71f3390401781dcc9fc422c9a43e3d58d246334a71f3390401781dc
linuxlinux>= a9e6f83c2df199187a5248f824f31b6787ae23ae < 0042178a69eb77a979e36a50dcce9794a3140ef80042178a69eb77a979e36a50dcce9794a3140ef8
linuxlinux>= a9e6f83c2df199187a5248f824f31b6787ae23ae < 72a8aee863af099d4434314c4536d6c9a61dcf3c72a8aee863af099d4434314c4536d6c9a61dcf3c
linuxlinux>= a9e6f83c2df199187a5248f824f31b6787ae23ae < 3e078b18753669615301d946297bafd69294ad2c3e078b18753669615301d946297bafd69294ad2c
linuxlinux>= a9e6f83c2df199187a5248f824f31b6787ae23ae < ebe2b1add1055b903e2acd86b290a85297edc0b3ebe2b1add1055b903e2acd86b290a85297edc0b3
linuxlinux_kernel>= 0 < 5.10.103-15.10.103-1
linuxlinux_kernel>= 0 < 5.16.10-15.16.10-1
linuxlinux_kernel>= 0 < 5.16.10-15.16.10-1
linuxlinux_kernel>= 0 < 5.16.10-15.16.10-1
linuxlinux_kernel>= 4.15 < 4.19.2304.19.230
linuxlinux_kernel>= 4.20 < 5.4.1805.4.180
linuxlinux_kernel>= 4.9 < 4.14.2674.14.267
linuxlinux_kernel>= 5.11 < 5.15.245.15.24
linuxlinux_kernel>= 5.16 < 5.16.105.16.10
linuxlinux_kernel>= 5.5 < 5.10.1015.10.101

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.