CVE-2022-50405

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2022-50405
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50405.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-50405
Downstream
Related
Published
2025-09-18T16:03:50.362Z
Modified
2026-03-20T12:22:34.750672Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
net/tunnel: wait until all sk_user_data reader finish before releasing the sock
Details

In the Linux kernel, the following vulnerability has been resolved:

net/tunnel: wait until all skuserdata reader finish before releasing the sock

There is a race condition in vxlan that when deleting a vxlan device during receiving packets, there is a possibility that the sock is released after getting vxlansock vs from skuserdata. Then in later vxlanecndecapsulate(), vxlangetskfamily() we will got NULL pointer dereference. e.g.

#0 [ffffa25ec6978a38] machine_kexec at ffffffff8c669757 #1 [ffffa25ec6978a90] __crashkexec at ffffffff8c7c0a4d #2 [ffffa25ec6978b58] crashkexec at ffffffff8c7c1c48 #3 [ffffa25ec6978b60] oopsend at ffffffff8c627f2b #4 [ffffa25ec6978b80] pagefaultoops at ffffffff8c678fcb #5 [ffffa25ec6978bd8] excpagefault at ffffffff8d109542 #6 [ffffa25ec6978c00] asmexcpagefault at ffffffff8d200b62 [exception RIP: vxlanecndecapsulate+0x3b] RIP: ffffffffc1014e7b RSP: ffffa25ec6978cb0 RFLAGS: 00010246 RAX: 0000000000000008 RBX: ffff8aa000888000 RCX: 0000000000000000 RDX: 000000000000000e RSI: ffff8a9fc7ab803e RDI: ffff8a9fd1168700 RBP: ffff8a9fc7ab803e R8: 0000000000700000 R9: 00000000000010ae R10: ffff8a9fcb748980 R11: 0000000000000000 R12: ffff8a9fd1168700 R13: ffff8aa000888000 R14: 00000000002a0000 R15: 00000000000010ae ORIGRAX: ffffffffffffffff CS: 0010 SS: 0018 #7 [ffffa25ec6978ce8] vxlanrcv at ffffffffc10189cd [vxlan] #8 [ffffa25ec6978d90] udpqueuercvoneskb at ffffffff8cfb6507 #9 [ffffa25ec6978dc0] udpunicastrcv_skb at ffffffff8cfb6e45 #10 [ffffa25ec6978dc8] __udp4librcv at ffffffff8cfb8807 #11 [ffffa25ec6978e20] ipprotocoldeliverrcu at ffffffff8cf76951 #12 [ffffa25ec6978e48] iplocal_deliver at ffffffff8cf76bde #13 [ffffa25ec6978ea0] __netifreceiveskbonecore at ffffffff8cecde9b #14 [ffffa25ec6978ec8] process_backlog at ffffffff8cece139 #15 [ffffa25ec6978f00] __napipoll at ffffffff8ceced1a #16 [ffffa25ec6978f28] netrx_action at ffffffff8cecf1f3 #17 [ffffa25ec6978fa0] _softirqentrytextstart at ffffffff8d4000ca #18 [ffffa25ec6978ff0] dosoftirq at ffffffff8c6fbdc3

Reproducer: https://github.com/Mellanox/ovs-tests/blob/master/test-ovs-vxlan-remove-tunnel-during-traffic.sh

Fix this by waiting for all skuserdata reader to finish before releasing the sock.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50405.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d
Fixed
e8316584b0a6c61c9c407631040c22712b26e38c
Fixed
84e566d157cc22ad2da8bdd970495855fbf13d92
Fixed
be34e79e0ae6adbf6e7e75ddaee9ad84795ab933
Fixed
303000c793f705d07b551eb7c1c27001c5b33c8d
Fixed
91f09a776ae335ca836ed864b8f2a9461882a280
Fixed
9a6544343bba7da929d6d4a2dc44ec0f15970081
Fixed
b38aa7465411795e9e744b8d94633910497fec2a
Fixed
588d0b8462f5ffed3e677e65639825b2678117ab
Fixed
3cf7203ca620682165706f70a1b12b5194607dce

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50405.json"