CVE-2024-26739

2024-04-0317:15:51

Linux

web.nvd.nist.gov

linux kernel

vulnerability

resolution

net/sched

act_mirred

skb

tcf_mirred_forward

uaf

nvd

AI Score

6.3

Confidence

Low

EPSS

Percentile

15.5%

JSON

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

net/sched: act_mirred: don’t override retval if we already lost the skb

If we’re redirecting the skb, and haven’t called tcf_mirred_forward(),
yet, we need to tell the core to drop the skb by setting the retcode
to SHOT. If we have called tcf_mirred_forward(), however, the skb
is out of our hands and returning SHOT will lead to UaF.

Move the retval override to the error path which actually need it.

Affected configurations

Vulners

Node

linuxlinux_kernelRange4.19–6.6.19

linuxlinux_kernelRange6.7.0–6.7.7

linuxlinux_kernelRange6.8.0≥

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/sched/act_mirred.c"
    ],
    "versions": [
      {
        "version": "e5cf1baf92cb",
        "lessThan": "28cdbbd38a44",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5cf1baf92cb",
        "lessThan": "f4e294bbdca8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e5cf1baf92cb",
        "lessThan": "166c2c8a6a4d",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/sched/act_mirred.c"
    ],
    "versions": [
      {
        "version": "4.19",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.19",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.19",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.7",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]