Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2022-48822— usb: f_fs: Fix use-after-free for epfile

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.

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usb:f_fs模块中发现释放后重用问题。当ffs_func_eps_disable在组合开关过程中被调用，同时用户空间调用ffs_epfile_release，这可能导致在释放读缓冲区后，驱动程序尝试访问已经被释放的内存。

CVSS 7.8 · High EPSS 0.27% · P20

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a9e6f83c2df199187a5248f824f31b6787ae23ae< 32048f4be071f9a6966744243f1786f45bb22dc2 affected
a9e6f83c2df199187a5248f824f31b6787ae23ae< cfe5f6fd335d882bcc829a1c8a7d462a455c626e affected
a9e6f83c2df199187a5248f824f31b6787ae23ae< c9fc422c9a43e3d58d246334a71f3390401781dc affected
a9e6f83c2df199187a5248f824f31b6787ae23ae< 0042178a69eb77a979e36a50dcce9794a3140ef8 affected
a9e6f83c2df199187a5248f824f31b6787ae23ae< 72a8aee863af099d4434314c4536d6c9a61dcf3c affected
a9e6f83c2df199187a5248f824f31b6787ae23ae< 3e078b18753669615301d946297bafd69294ad2c affected
a9e6f83c2df199187a5248f824f31b6787ae23ae< ebe2b1add1055b903e2acd86b290a85297edc0b3 affected
5cd8f6788ff34999dbd4cbec81a6adfc215e1e60 affected
… +10 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2022-48822

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
usb: f_fs: Fix use-after-free for epfile
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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usb:f_fs模块中发现释放后重用问题。当ffs_func_eps_disable在组合开关过程中被调用，同时用户空间调用ffs_epfile_release，这可能导致在释放读缓冲区后，驱动程序尝试访问已经被释放的内存。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux a9e6f83c2df199187a5248f824f31b6787ae23ae ~ 32048f4be071f9a6966744243f1786f45bb22dc2 -
Linux Linux 4.9 -

II. Public POCs for CVE-2022-48822

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2022-48822

请登录查看更多情报信息。

Other References for CVE-2022-48822 (7)

Same Patch Batch · Linux · 2024-07-16 · 98 CVEs total

CVE-2022-48788 9.8 CRITICAL nvme-rdma: fix possible use-after-free in transport error_recovery work
CVE-2022-48789 9.8 CRITICAL nvme-tcp: fix possible use-after-free in transport error_recovery work
CVE-2022-48790 9.8 CRITICAL nvme: fix a possible use-after-free in controller reset during load
CVE-2022-48851 9.8 CRITICAL staging: gdm724x: fix use after free in gdm_lte_rx()
CVE-2022-48829 9.1 CRITICAL NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes
CVE-2022-48828 9.1 CRITICAL NFSD: Fix ia_size underflow
CVE-2022-48864 8.8 HIGH vdpa/mlx5: add validation for VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET command
CVE-2022-48830 8.8 HIGH can: isotp: fix potential CAN frame reception race in isotp_rcv()
CVE-2022-48785 8.8 HIGH ipv6: mcast: use rcu-safe version of ipv6_get_lladdr()
CVE-2022-48782 8.8 HIGH mctp: fix use after free
CVE-2022-48786 7.8 HIGH vsock: remove vsock from connected table when connect is interrupted by a signal
CVE-2024-41008 7.8 HIGH drm/amdgpu: change vm->task_info handling
CVE-2022-48791 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted TMF sas_task
CVE-2022-48792 7.8 HIGH scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task
CVE-2022-48796 7.8 HIGH iommu: Fix potential use-after-free during probe
CVE-2022-48847 7.8 HIGH watch_queue: Fix filter limit check
CVE-2022-48801 7.8 HIGH iio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL
CVE-2022-48839 7.8 HIGH net/packet: fix slab-out-of-bounds access in packet_recvmsg()
CVE-2022-48816 7.8 HIGH SUNRPC: lock against ->sock changing during sysfs read
CVE-2022-48821 7.8 HIGH misc: fastrpc: avoid double fput() on failed usercopy

Showing top 20 of 98 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48822

No comments yet

Leave a comment