CVE-2024-38586 r8169: Fix possible ring buffer corruption on fragmented Tx packets.

2024-06-1913:37:41

Linux

www.cve.org

cve-2024-38586

linux kernel

rtl8125b

ring buffer corruption

fragmented tx packets

rtl8169_start_xmit

dma_unmap_single

0.0004 Low

EPSS

Percentile

10.4%

JSON

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

r8169: Fix possible ring buffer corruption on fragmented Tx packets.

An issue was found on the RTL8125b when transmitting small fragmented
packets, whereby invalid entries were inserted into the transmit ring
buffer, subsequently leading to calls to dma_unmap_single() with a null
address.

This was caused by rtl8169_start_xmit() not noticing changes to nr_frags
which may occur when small packets are padded (to work around hardware
quirks) in rtl8169_tso_csum_v2().

To fix this, postpone inspecting nr_frags until after any padding has been
applied.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/realtek/r8169_main.c"
    ],
    "versions": [
      {
        "version": "9020845fb5d6",
        "lessThan": "b6d21cf40de1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9020845fb5d6",
        "lessThan": "0c48185a9530",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9020845fb5d6",
        "lessThan": "68222d7b4b72",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9020845fb5d6",
        "lessThan": "078d5b7500d7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9020845fb5d6",
        "lessThan": "54e7a0d11124",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9020845fb5d6",
        "lessThan": "c71e3a5cffd5",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/realtek/r8169_main.c"
    ],
    "versions": [
      {
        "version": "5.7",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.7",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.161",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.93",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.33",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.12",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.3",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]