GHSA-HFJ5-Q228-92R2
Vulnerability from github – Published: 2025-05-01 15:31 – Updated: 2025-11-03 21:33In the Linux kernel, the following vulnerability has been resolved:
net: dsa: mv88e6xxx: avoid unregistering devlink regions which were never registered
Russell King reports that a system with mv88e6xxx dereferences a NULL pointer when unbinding this driver: https://lore.kernel.org/netdev/Z_lRkMlTJ1KQ0kVX@shell.armlinux.org.uk/
The crash seems to be in devlink_region_destroy(), which is not NULL tolerant but is given a NULL devlink global region pointer.
At least on some chips, some devlink regions are conditionally registered since the blamed commit, see mv88e6xxx_setup_devlink_regions_global():
if (cond && !cond(chip))
continue;
These are MV88E6XXX_REGION_STU and MV88E6XXX_REGION_PVT. If the chip does not have an STU or PVT, it should crash like this.
To fix the issue, avoid unregistering those regions which are NULL, i.e. were skipped at mv88e6xxx_setup_devlink_regions_global() time.
{
"affected": [],
"aliases": [
"CVE-2025-37787"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-01T14:15:43Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: avoid unregistering devlink regions which were never registered\n\nRussell King reports that a system with mv88e6xxx dereferences a NULL\npointer when unbinding this driver:\nhttps://lore.kernel.org/netdev/Z_lRkMlTJ1KQ0kVX@shell.armlinux.org.uk/\n\nThe crash seems to be in devlink_region_destroy(), which is not NULL\ntolerant but is given a NULL devlink global region pointer.\n\nAt least on some chips, some devlink regions are conditionally registered\nsince the blamed commit, see mv88e6xxx_setup_devlink_regions_global():\n\n\t\tif (cond \u0026\u0026 !cond(chip))\n\t\t\tcontinue;\n\nThese are MV88E6XXX_REGION_STU and MV88E6XXX_REGION_PVT. If the chip\ndoes not have an STU or PVT, it should crash like this.\n\nTo fix the issue, avoid unregistering those regions which are NULL, i.e.\nwere skipped at mv88e6xxx_setup_devlink_regions_global() time.",
"id": "GHSA-hfj5-q228-92r2",
"modified": "2025-11-03T21:33:46Z",
"published": "2025-05-01T15:31:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37787"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3665695e3572239dc233216f06b41f40cc771889"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5f5e95945bb1e08be7655da6acba648274db457d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8ccdf5e24b276848eefb2755e05ff0f005a0c4a1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b3c70dfe51f10df60db2646c08cebd24bcdc5247"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bbb80f004f7a90c3dcaacc982c59967457254a05"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c84f6ce918a9e6f4996597cbc62536bbf2247c96"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
}
],
"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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