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MediumFix available

arm64: probes: Fix uprobes for big-endian kernels

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: arm64: probes: Fix uprobes for big-endian kernels The arm64 uprobes code is broken for big-endian kernels as it doesn't convert the in-memory instruction encoding (which is always little-endian) into the kernel's native endianness before analyzing and simulating instructions. This may result in a few distinct problems: * The kernel may may erroneously reject probing an instruction which can safely be probed. * The kernel may erroneously erroneously permit stepping an instruction out-of-line when that instruction cannot be stepped out-of-line safely. * The kernel may erroneously simulate instruction incorrectly dur to interpretting the byte-swapped encoding. The endianness mismatch isn't caught by the compiler or sparse because: * The arch_uprobe::{insn,ixol} fields are encoded as arrays of u8, so the compiler and sparse have no idea these contain a little-endian 32-bit value. The core uprobes code populates these with a memcpy() which similarly does not handle endianness. * While the uprobe_opcode_t type is an alias for __le32, both arch_uprobe_analyze_insn() and arch_uprobe_skip_sstep() cast from u8[] to the similarly-named probe_opcode_t, which is an alias for u32. Hence there is no endianness conversion warning. Fix this by changing the arch_uprobe::{insn,ixol} fields to __le32 and adding the appropriate __le32_to_cpu() conversions prior to consuming the instruction encoding. The core uprobes copies these

Products
Kernel
Affected versions
Not specified
Fixed versions
4.19.323, 5.10.229, 5.15.170, 5.4.285, 6.1.115, 6.11.5, 6.6.58
CVEs
CVE-2024-50194
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 10:37 UTC · Revision 1

Source evidence

arm64: probes: Fix uprobes for big-endian kernels

core-osv · Original source

Published 8 Nov 2024, 05:54 UTC

In the Linux kernel, the following vulnerability has been resolved: arm64: probes: Fix uprobes for big-endian kernels The arm64 uprobes code is broken for big-endian kernels as it doesn't convert the in-memory instruction encoding (which is always little-endian) into the kernel's native endianness before analyzing and simulating instructions. This may result in a few distinct problems: * The kernel may may erroneously reject probing an instruction which can safely be probed. * The kernel may erroneously erroneously permit stepping an instruction out-of-line when that instruction cannot be stepped out-of-line safely. * The kernel may erroneously simulate instruction incorrectly dur to interpretting the byte-swapped encoding. The endianness mismatch isn't caught by the compiler or sparse because: * The arch_uprobe::{insn,ixol} fields are encoded as arrays of u8, so the compiler and sparse have no idea these contain a little-endian 32-bit value. The core uprobes code populates these with a memcpy() which similarly does not handle endianness. * While the uprobe_opcode_t type is an alias for __le32, both arch_uprobe_analyze_insn() and arch_uprobe_skip_sstep() cast from u8[] to the similarly-named probe_opcode_t, which is an alias for u32. Hence there is no endianness conversion warning. Fix this by changing the arch_uprobe::{insn,ixol} fields to __le32 and adding the appropriate __le32_to_cpu() conversions prior to consuming the instruction encoding. The core uprobes copies these

osv:CVE-2024-50194

Kernel

Fixed versions: 4.19.323, 5.4.285, 5.10.229, 5.15.170, 6.1.115, 6.6.58, 6.11.5

Complete source record
{
  "id": "b5003818091ae0ca045e8910fe96178ef051a6525211f4d2063c6d3374175779",
  "url": "https://osv.dev/vulnerability/CVE-2024-50194",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "arm64: probes: Fix uprobes for big-endian kernels",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: arm64: probes: Fix uprobes for big-endian kernels The arm64 uprobes code is broken for big-endian kernels as it doesn't convert the in-memory instruction encoding (which is always little-endian) into the kernel's native endianness before analyzing and simulating instructions. This may result in a few distinct problems: * The kernel may may erroneously reject probing an instruction which can safely be probed. * The kernel may erroneously erroneously permit stepping an instruction out-of-line when that instruction cannot be stepped out-of-line safely. * The kernel may erroneously simulate instruction incorrectly dur to interpretting the byte-swapped encoding. The endianness mismatch isn't caught by the compiler or sparse because: * The arch_uprobe::{insn,ixol} fields are encoded as arrays of u8, so the compiler and sparse have no idea these contain a little-endian 32-bit value. The core uprobes code populates these with a memcpy() which similarly does not handle endianness. * While the uprobe_opcode_t type is an alias for __le32, both arch_uprobe_analyze_insn() and arch_uprobe_skip_sstep() cast from u8[] to the similarly-named probe_opcode_t, which is an alias for u32. Hence there is no endianness conversion warning. Fix this by changing the arch_uprobe::{insn,ixol} fields to __le32 and adding the appropriate __le32_to_cpu() conversions prior to consuming the instruction encoding. The core uprobes copies these ",
    "evidence": "osv:CVE-2024-50194",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "4.19.323",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.4.285",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.115",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.58",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-50194",
      "aliases": [
        "CVE-2024-50194"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
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              "type": "GIT",
              "events": [
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50194.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.10.0"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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            {
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            {
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      ],
      "modified": "2026-10-28T02:30:28.274510861Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/13f8f1e05f1dc36dbba6cba0ae03354c0dafcde7",
        "https://git.kernel.org/stable/c/14841bb7a531b96e2dde37423a3b33e75147c60d",
        "https://git.kernel.org/stable/c/3d2530c65be04e93720e30f191a7cf1a3aa8b51c",
        "https://git.kernel.org/stable/c/8165bf83b8a64be801d59cd2532b0d1ffed74d00",
        "https://git.kernel.org/stable/c/b6a638cb600e13f94b5464724eaa6ab7f3349ca2",
        "https://git.kernel.org/stable/c/cf60d19d40184e43d9a624e55a0da73be09e938d",
        "https://git.kernel.org/stable/c/cf9ddf9ed94c15564a05bbf6e9f18dffa0c7df80",
        "https://git.kernel.org/stable/c/e6ab336213918575124d6db43dc5d3554526242e",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50194.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50194",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50194.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50194",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494599,
  "published_at": "2024-11-08T05:54:09.327+00:00"
}