GHSA-RFCJ-G8R9-Q3MJ
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In the Linux kernel, the following vulnerability has been resolved:
lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()
Patch series "lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()", v2.
This series fixes an off-by-one out-of-bounds read in ucs2_strnlen().
The first patch is the real fix, the second patch comes as a bonus and fixes the code indentation.
This patch (of 2):
ucs2_strnlen() checks the current character before checking whether the caller-provided maximum length has been reached. If the input is not NUL-terminated within that bound, the loop can read one ucs2_char_t past the limit.
Test the length before dereferencing to prevent an off-by-one out-of-bounds read.
{
"affected": [],
"aliases": [
"CVE-2026-89726"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:20:02Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()\n\nPatch series \"lib/ucs2_string.c: fix out-of-bounds read in\nucs2_strnlen()\", v2.\n\nThis series fixes an off-by-one out-of-bounds read in ucs2_strnlen().\n\nThe first patch is the real fix, the second patch comes as a bonus and\nfixes the code indentation.\n\n\nThis patch (of 2):\n\nucs2_strnlen() checks the current character before checking whether the\ncaller-provided maximum length has been reached. If the input is not\nNUL-terminated within that bound, the loop can read one ucs2_char_t past\nthe limit.\n\nTest the length before dereferencing to prevent an off-by-one\nout-of-bounds read.",
"id": "GHSA-rfcj-g8r9-q3mj",
"modified": "2026-09-14T15:32:35Z",
"published": "2026-09-11T21:31:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89726"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/04ae68af4107600120c3c41c94268f43bc350d48"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1b0dc3cbb8630f0b5cb34d848628225920a904be"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2e5a70a175f0c74e7238b013a96c4eabc3002934"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3ada20e110bf3245edb0a3bcddadc33d0f142f8d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/60c74f42f5abddb85dd919b4448d5474e65dbe76"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/709eb41adaf78d59d4579a13a898125919b69bcc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7d658da725ea81c91f73087547b97e7ced82d62b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cec0d03fe785380540dc1b4d07c80f67ae2ffc78"
}
],
"schema_version": "1.4.0",
"severity": []
}
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