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CVE-2021-47223— net: bridge: fix vlan tunnel dst null pointer dereference

EPSS 0.01% · P3

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinux11538d039ac6efcf4f1a6c536e1b87cd3668a9fd< ad7feefe7164892db424c45687472db803d87f79affected
11538d039ac6efcf4f1a6c536e1b87cd3668a9fd< 24a6e55f17aa123bc1fc54b7d3c410b41bc16530affected
11538d039ac6efcf4f1a6c536e1b87cd3668a9fd< a2241e62f6b4a774d8a92048fdf59c45f6c2fe5caffected
11538d039ac6efcf4f1a6c536e1b87cd3668a9fd< fe0448a3fad365a747283a00a1d1ad5e8d6675b7affected
11538d039ac6efcf4f1a6c536e1b87cd3668a9fd< abb02e05cb1c0a30dd873a29f33bc092067dc35daffected
11538d039ac6efcf4f1a6c536e1b87cd3668a9fd< 58e2071742e38f29f051b709a5cca014ba51166faffected
4.11affected
< 4.11unaffected
… +6 more rows
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I. Basic Information for CVE-2021-47223

Vulnerability Information
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Vulnerability Title
net: bridge: fix vlan tunnel dst null pointer dereference
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix vlan tunnel dst null pointer dereference This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. When deleting a vlan tunnel the tunnel_dst pointer is set to NULL without waiting a grace period (i.e. while it's still usable) and packets egressing are dereferencing it without checking. Use READ/WRITE_ONCE to annotate the lockless use of tunnel_id, use RCU for accessing tunnel_dst and make sure it is read only once and checked in the egress path. The dst is already properly RCU protected so we don't need to do anything fancy than to make sure tunnel_id and tunnel_dst are read only once and checked in the egress path.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于存在空指针取消引用。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd ~ ad7feefe7164892db424c45687472db803d87f79 -
LinuxLinux 4.11 -

II. Public POCs for CVE-2021-47223

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III. Intelligence Information for CVE-2021-47223

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Same Patch Batch · Linux · 2024-05-21 · 361 CVEs total

CVE-2021-47432lib/generic-radix-tree.c: Don't overflow in peek()
CVE-2023-52760gfs2: Fix slab-use-after-free in gfs2_qd_dealloc
CVE-2023-52757smb: client: fix potential deadlock when releasing mids
CVE-2023-52755ksmbd: fix slab out of bounds write in smb_inherit_dacl()
CVE-2023-52754media: imon: fix access to invalid resource for the second interface
CVE-2023-52753drm/amd/display: Avoid NULL dereference of timing generator
CVE-2023-52752smb: client: fix use-after-free bug in cifs_debug_data_proc_show()
CVE-2023-52751smb: client: fix use-after-free in smb2_query_info_compound()
CVE-2023-52750arm64: Restrict CPU_BIG_ENDIAN to GNU as or LLVM IAS 15.x or newer
CVE-2023-52749spi: Fix null dereference on suspend
CVE-2023-52748f2fs: avoid format-overflow warning
CVE-2022-48710drm/radeon: fix a possible null pointer dereference
CVE-2023-52742net: USB: Fix wrong-direction WARNING in plusb.c
CVE-2023-52738drm/amdgpu/fence: Fix oops due to non-matching drm_sched init/fini
CVE-2023-52740powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch
CVE-2023-52739Fix page corruption caused by racy check in __free_pages
CVE-2023-52741cifs: Fix use-after-free in rdata->read_into_pages()
CVE-2023-52743ice: Do not use WQ_MEM_RECLAIM flag for workqueue
CVE-2023-52746xfrm/compat: prevent potential spectre v1 gadget in xfrm_xlate32_attr()
CVE-2023-52747IB/hfi1: Restore allocated resources on failed copyout

Showing top 20 of 361 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47223

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