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CVE-2022-49743— ovl: Use "buf" flexible array for memcpy() destination

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，该漏洞源于错误使用flexible数组作为memcpy目标。

CVSS 7.5 · High EPSS 0.45% · P38

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux cbe7fba8edfc8cb8e621599e376f8ac5c224fa72< 012cdef22000f3104e4fa8224ad29fde509b8caf affected
cbe7fba8edfc8cb8e621599e376f8ac5c224fa72< a77141a06367825d639ac51b04703d551163e36c affected
cbe7fba8edfc8cb8e621599e376f8ac5c224fa72< 07a96977b2f462337a9121302de64277b8747ab1 affected
cbe7fba8edfc8cb8e621599e376f8ac5c224fa72< cf8aa9bf97cadf85745506c6a3e244b22c268d63 affected
5.5 affected
< 5.5 unaffected
5.10.248≤ 5.10.* unaffected
5.15.93≤ 5.15.* unaffected
… +2 more rows
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I. Basic Information for CVE-2022-49743

Vulnerability Information
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Vulnerability Title
ovl: Use "buf" flexible array for memcpy() destination
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ovl: Use "buf" flexible array for memcpy() destination The "buf" flexible array needs to be the memcpy() destination to avoid false positive run-time warning from the recent FORTIFY_SOURCE hardening: memcpy: detected field-spanning write (size 93) of single field "&fh->fb" at fs/overlayfs/export.c:799 (size 21)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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，该漏洞源于错误使用flexible数组作为memcpy目标。
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 cbe7fba8edfc8cb8e621599e376f8ac5c224fa72 ~ 012cdef22000f3104e4fa8224ad29fde509b8caf -
Linux Linux 5.5 -

II. Public POCs for CVE-2022-49743

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III. Intelligence Information for CVE-2022-49743

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Patches & Fixes for CVE-2022-49743 (1)

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-2022-49755 7.8 HIGH usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait
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-2023-52999 7.8 HIGH net: fix UaF in netns ops registration error path
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

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-2022-49743

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