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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2022-49755— usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait

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ffs_ep0_queue_wait竞争条件。

CVSS 7.8 · High EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux ddf8abd2599491cbad959c700b90ba72a5dce8d0< facf353c9e8d7885b686d9a4b173d4e0af6441d2 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< a8d40942df074f4ebcb9bd3413596d92f323b064 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< 6dd9ea05534f323668db94fcc2726c7a84547e78 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< ae8e136bcaae96163b5821984de1036efc9abb1a affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< 6aee197b7fbcd61596a78b47d553f2f99111f217 affected
ddf8abd2599491cbad959c700b90ba72a5dce8d0< 6a19da111057f69214b97c62fb0ac59023970850 affected
2.6.35 affected
… +8 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2022-49755

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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: gadget: f_fs: Prevent race during ffs_ep0_queue_wait
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind. Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free. Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).
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ffs_ep0_queue_wait竞争条件。
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 ddf8abd2599491cbad959c700b90ba72a5dce8d0 ~ facf353c9e8d7885b686d9a4b173d4e0af6441d2 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2022-49755

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2022-49755

请登录查看更多情报信息。

Same Patch Batch · Linux · 2025-03-27 · 124 CVEs total

CVE-2023-53006 9.8 CRITICAL cifs: Fix oops due to uncleared server->smbd_conn in reconnect
CVE-2025-21876 8.8 HIGH iommu/vt-d: Fix suspicious RCU usage
CVE-2025-21890 8.2 HIGH idpf: fix checksums set in idpf_rx_rsc()
CVE-2023-52999 7.8 HIGH net: fix UaF in netns ops registration error path
CVE-2025-21887 7.8 HIGH ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up
CVE-2025-21889 7.8 HIGH perf/core: Add RCU read lock protection to perf_iterate_ctx()
CVE-2023-52930 7.8 HIGH drm/i915: Fix potential bit_17 double-free
CVE-2023-52931 7.8 HIGH drm/i915: Avoid potential vm use-after-free
CVE-2023-52934 7.8 HIGH mm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups
CVE-2023-53009 7.8 HIGH drm/amdkfd: Add sync after creating vram bo
CVE-2023-52973 7.8 HIGH vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
CVE-2023-52981 7.8 HIGH drm/i915: Fix request ref counting during error capture & debugfs dump
CVE-2023-52983 7.8 HIGH block, bfq: fix uaf for bfqq in bic_set_bfqq()
CVE-2023-52975 7.8 HIGH scsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress
CVE-2023-52974 7.8 HIGH scsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress
CVE-2023-52987 7.8 HIGH ASoC: SOF: ipc4-mtrace: prevent underflow in sof_ipc4_priority_mask_dfs_write()
CVE-2025-21867 7.8 HIGH bpf, test_run: Fix use-after-free issue in eth_skb_pkt_type()
CVE-2023-52988 7.8 HIGH ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()
CVE-2023-52935 7.8 HIGH mm/khugepaged: fix ->anon_vma race
CVE-2022-49760 7.8 HIGH mm/hugetlb: fix PTE marker handling in hugetlb_change_protection()

Showing top 20 of 124 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-49755

No comments yet

Leave a comment