GHSA-3XCP-XR96-V535

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-15 18:30
VLAI
Details

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

kexec: derive purgatory entry from symbol

kexec_load_purgatory() derives image->start by locating e_entry inside an SHF_EXECINSTR section. If the purgatory object contains multiple executable sections with overlapping sh_addr, the entrypoint check can match more than once and trigger a WARN.

Derive the entry section from the purgatory_start symbol when present and compute image->start from its final placement. Keep the existing e_entry fallback for purgatories that do not expose the symbol.

WARNING: kernel/kexec_file.c:1009 at kexec_load_purgatory+0x395/0x3c0, CPU#10: kexec/1784 Call Trace: bzImage64_load+0x133/0xa00 __do_sys_kexec_file_load+0x2b3/0x5c0 do_syscall_64+0x81/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e

[me@linux.beauty: move helper to avoid forward declaration, per Baoquan]

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43289"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T14:16:35Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkexec: derive purgatory entry from symbol\n\nkexec_load_purgatory() derives image-\u003estart by locating e_entry inside an\nSHF_EXECINSTR section.  If the purgatory object contains multiple\nexecutable sections with overlapping sh_addr, the entrypoint check can\nmatch more than once and trigger a WARN.\n\nDerive the entry section from the purgatory_start symbol when present and\ncompute image-\u003estart from its final placement.  Keep the existing e_entry\nfallback for purgatories that do not expose the symbol.\n\nWARNING: kernel/kexec_file.c:1009 at kexec_load_purgatory+0x395/0x3c0, CPU#10: kexec/1784\nCall Trace:\n \u003cTASK\u003e\n bzImage64_load+0x133/0xa00\n __do_sys_kexec_file_load+0x2b3/0x5c0\n do_syscall_64+0x81/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n[me@linux.beauty: move helper to avoid forward declaration, per Baoquan]",
  "id": "GHSA-3xcp-xr96-v535",
  "modified": "2026-05-15T18:30:29Z",
  "published": "2026-05-08T15:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43289"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/027797595a108726f4a0a45d225f603b0ffbd22b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1737d37ae1d2814e6cf0a1af87af3d41f0812b95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36eb314184a0ae74dd42914b47d2b9fc43be8034"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/480e1d5c64bb14441f79f2eb9421d5e26f91ea3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5226570bd252cea2e805a161cb0f75c204c3108a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/875355152b33436907c2a6d2ffad1431fa86c62b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfccd3b8c51bc57a8a6fcb2fd30453afae5bc0d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f736032c638a33a243e9126e617788f763d648f9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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