CVE-2024-26816 x86, relocs: Ignore relocations in .notes section

2024-04-1013:53:49

Linux

github.com

vulnerability

linux kernel

x86

relocs

kaslr

config_xen_pv

xen

.notes section

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.2%

JSON

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

x86, relocs: Ignore relocations in .notes section

When building with CONFIG_XEN_PV=y, .text symbols are emitted into
the .notes section so that Xen can find the “startup_xen” entry point.
This information is used prior to booting the kernel, so relocations
are not useful. In fact, performing relocations against the .notes
section means that the KASLR base is exposed since /sys/kernel/notes
is world-readable.

To avoid leaking the KASLR base without breaking unprivileged tools that
are expecting to read /sys/kernel/notes, skip performing relocations in
the .notes section. The values readable in .notes are then identical to
those found in System.map.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "13edb509abc9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "52018aa146e3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "a4e7ff1a7427",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "c7cff9780297",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "47635b112a64",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "af2a9f98d884",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "ae7079238f6f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "5cb59db49c9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5ead97c84fa7",
        "lessThan": "aaa8736370db",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/x86/tools/relocs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.23"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.23",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "4.19.311",
        "versionType": "custom",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.273",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.214",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.153",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.83",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.23",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.11",
        "versionType": "custom",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.2",
        "versionType": "custom",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/x86/tools/relocs.c"
    ],
    "defaultStatus": "affected"
  }
]