CVE-2021-47558 net: stmmac: Disable Tx queues when reconfiguring the interface

2024-05-2415:09:59

Linux

github.com

linux kernel

netif_tx_disable

reconfiguring interface

kernel panic

xdp program

dwmac4_set_addr

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

9.1%

JSON

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

net: stmmac: Disable Tx queues when reconfiguring the interface

The Tx queues were not disabled in situations where the driver needed to
stop the interface to apply a new configuration. This could result in a
kernel panic when doing any of the 3 following actions:

reconfiguring the number of queues (ethtool -L)
reconfiguring the size of the ring buffers (ethtool -G)
installing/removing an XDP program (ip l set dev ethX xdp)

Prevent the panic by making sure netif_tx_disable is called when stopping
an interface.

Without this patch, the following kernel panic can be observed when doing
any of the actions above:

Unable to handle kernel paging request at virtual address ffff80001238d040
[…]
Call trace:
dwmac4_set_addr+0x8/0x10
dev_hard_start_xmit+0xe4/0x1ac
sch_direct_xmit+0xe8/0x39c
__dev_queue_xmit+0x3ec/0xaf0
dev_queue_xmit+0x14/0x20
[…]
[ end trace 0000000000000002 ]—

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0366f7e06a6b",
        "lessThan": "a92f0eebb8dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0366f7e06a6b",
        "lessThan": "b270bfe69736",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.15.6",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "5.16",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
    ],
    "defaultStatus": "affected"
  }
]