CVE-2022-50476

MEDIUM EPSS 4.2%
Published Oct 4, 20258mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 4, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ntb_netdev: Use dev_kfree_skb_any() in interrupt context TX/RX callback handlers (ntb_netdev_tx_handler(), ntb_netdev_rx_handler()) can be called in interrupt context via the DMA framework when the respective DMA operations have completed. As such, any calls by these routines to free skb's, should use the interrupt context safe dev_kfree_skb_any() function. Previously, these callback handlers would call the interrupt unsafe version of dev_kfree_skb(). This has not presented an issue on Intel IOAT DMA engines as that driver utilizes tasklets rather than a hard interrupt handler, like the AMD PTDMA DMA driver. On AMD systems, a kernel WARNING message is encountered, which is being issued from skb_release_head_state() due to in_hardirq() being true. Besides the user visible WARNING from the kernel, the other symptom of this bug was that TCP/IP performance across the ntb_netdev interface was very poor, i.e. approximately an order of magnitude below what was expected. With the repair to use dev_kfree_skb_any(), kernel WARNINGs from skb_release_head_state() ceased and TCP/IP performance, as measured by iperf, was on par with expected results, approximately 20 Gb/s on AMD Milan based server. Note that this performance is comparable with Intel based servers.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥3.9  –  <4.9.337
linuxlinux_kernel*≥4.10  –  <4.14.303
linuxlinux_kernel*≥4.15  –  <4.19.270
linuxlinux_kernel*≥4.20  –  <5.4.229
linuxlinux_kernel*≥5.5  –  <5.10.163
linuxlinux_kernel*≥5.11  –  <5.15.86
linuxlinux_kernel*≥5.16  –  <6.0.16
linuxlinux_kernel*≥6.1  –  <6.1.2

References 9

  • git.kernel.org https://git.kernel.org/stable/c/07e28a8f450217db679802ebd4de0915556ce846
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/13286ad1c7c49c606fdcba4cf66f953a1a16c1ca
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/14d245da57a11e80277ab455aa9b6dcc5ed38a19
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/21296a52caa6a6bad6debdfe40ad81d4f1a27e69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5f7d78b2b12a9d561f48fa00bab29b40f4616dad
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b78493968ed3cef0326183ed059c55e42f24d5b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6b9e09403102bdf8402dae734800e4916c7ea58
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d4460c82177899751975180c268f352893302221
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/07e28a8f450217db679802ebd4de0915556ce846
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/13286ad1c7c49c606fdcba4cf66f953a1a16c1ca
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/14d245da57a11e80277ab455aa9b6dcc5ed38a19
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/21296a52caa6a6bad6debdfe40ad81d4f1a27e69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5f7d78b2b12a9d561f48fa00bab29b40f4616dad
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b78493968ed3cef0326183ed059c55e42f24d5b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6b9e09403102bdf8402dae734800e4916c7ea58
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d4460c82177899751975180c268f352893302221
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67
    Patch