GHSA-25MJ-MFQW-XQM2

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 15:31
VLAI?
Details

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

netconsole: avoid OOB reads, msg is not nul-terminated

msg passed to netconsole from the console subsystem is not guaranteed to be nul-terminated. Before recent commit 7eab73b18630 ("netconsole: convert to NBCON console infrastructure") the message would be placed in printk_shared_pbufs, a static global buffer, so KASAN had harder time catching OOB accesses. Now we see:

printk: console [netcon_ext0] enabled
BUG: KASAN: slab-out-of-bounds in string+0x1f7/0x240
Read of size 1 at addr ffff88813b6d4c00 by task pr/netcon_ext0/594

CPU: 65 UID: 0 PID: 594 Comm: pr/netcon_ext0 Not tainted 6.19.0-11754-g4246fd6547c9
Call Trace:
 kasan_report+0xe4/0x120
 string+0x1f7/0x240
 vsnprintf+0x655/0xba0
 scnprintf+0xba/0x120
 netconsole_write+0x3fe/0xa10
 nbcon_emit_next_record+0x46e/0x860
 nbcon_kthread_func+0x623/0x750

Allocated by task 1:
 nbcon_alloc+0x1ea/0x450
 register_console+0x26b/0xe10
 init_netconsole+0xbb0/0xda0

The buggy address belongs to the object at ffff88813b6d4000
            which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes to the right of
            allocated 3072-byte region [ffff88813b6d4000, ffff88813b6d4c00)
Severity ?
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43197"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:38Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetconsole: avoid OOB reads, msg is not nul-terminated\n\nmsg passed to netconsole from the console subsystem is not guaranteed\nto be nul-terminated. Before recent\ncommit 7eab73b18630 (\"netconsole: convert to NBCON console infrastructure\")\nthe message would be placed in printk_shared_pbufs, a static global\nbuffer, so KASAN had harder time catching OOB accesses. Now we see:\n\n    printk: console [netcon_ext0] enabled\n    BUG: KASAN: slab-out-of-bounds in string+0x1f7/0x240\n    Read of size 1 at addr ffff88813b6d4c00 by task pr/netcon_ext0/594\n\n    CPU: 65 UID: 0 PID: 594 Comm: pr/netcon_ext0 Not tainted 6.19.0-11754-g4246fd6547c9\n    Call Trace:\n     kasan_report+0xe4/0x120\n     string+0x1f7/0x240\n     vsnprintf+0x655/0xba0\n     scnprintf+0xba/0x120\n     netconsole_write+0x3fe/0xa10\n     nbcon_emit_next_record+0x46e/0x860\n     nbcon_kthread_func+0x623/0x750\n\n    Allocated by task 1:\n     nbcon_alloc+0x1ea/0x450\n     register_console+0x26b/0xe10\n     init_netconsole+0xbb0/0xda0\n\n    The buggy address belongs to the object at ffff88813b6d4000\n                which belongs to the cache kmalloc-4k of size 4096\n    The buggy address is located 0 bytes to the right of\n                allocated 3072-byte region [ffff88813b6d4000, ffff88813b6d4c00)",
  "id": "GHSA-25mj-mfqw-xqm2",
  "modified": "2026-05-08T15:31:17Z",
  "published": "2026-05-06T12:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43197"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3126a2f98beaec5a554a1fb31c46db1e8542665e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82aec772fca2223bc5774bd9af486fd95766e578"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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