CVE-2021-47291 ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions

2024-05-2114:35:16

Linux

github.com

ipv6

vulnerability

fix

linux kernel

AI Score

6.8

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions

While running the self-tests on a KASAN enabled kernel, I observed a
slab-out-of-bounds splat very similar to the one reported in
commit 821bbf79fe46 (“ipv6: Fix KASAN: slab-out-of-bounds Read in
fib6_nh_flush_exceptions”).

We additionally need to take care of fib6_metrics initialization
failure when the caller provides an nh.

The fix is similar, explicitly free the route instead of calling
fib6_info_release on a half-initialized object.

CNA Affected

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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
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        "status": "affected",
        "version": "f88d8ea67fbd",
        "lessThan": "830251361425",
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    ],
    "programFiles": [
      "net/ipv6/route.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
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        "status": "affected",
        "version": "5.3"
      },
      {
        "status": "unaffected",
        "version": "0",
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        "versionType": "custom"
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      {
        "status": "unaffected",
        "version": "5.4.136",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.54",
        "versionType": "custom",
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      {
        "status": "unaffected",
        "version": "5.13.6",
        "versionType": "custom",
        "lessThanOrEqual": "5.13.*"
      },
      {
        "status": "unaffected",
        "version": "5.14",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/route.c"
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]