GHSA-JG8V-H49P-MVHW
Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32In the Linux kernel, the following vulnerability has been resolved:
libceph: Fix multiplication overflow in decode_new_up_state_weight()
If a message of type CEPH_MSG_OSD_MAP contains a (maliciously) corrupted osdmap, out-of-bounds memory accesses may occur in decode_new_up_state_weight(). This happens because the bounds check for the new_state part is based on calculating its length depending on a len value read from the incoming message. This calculation may overflow leading to an incorrect bounds check. Subsequently, out-of-bounds reads may occur when decoding this part.
This patch switches the multiplication to use check_mul_overflow() to abort processing the osdmap if an overflow occurred. Therefore, osdmaps/messages containing large values for len that result in a multiplication overflow are treated as invalid.
[ idryomov: rename new_state_len -> new_state_item_size, formatting ]
{
"affected": [],
"aliases": [
"CVE-2026-68158"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-10T13:20:02Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Fix multiplication overflow in decode_new_up_state_weight()\n\nIf a message of type CEPH_MSG_OSD_MAP contains a (maliciously) corrupted\nosdmap, out-of-bounds memory accesses may occur in\ndecode_new_up_state_weight(). This happens because the bounds check for\nthe new_state part is based on calculating its length depending on a len\nvalue read from the incoming message. This calculation may overflow\nleading to an incorrect bounds check. Subsequently, out-of-bounds reads\nmay occur when decoding this part.\n\nThis patch switches the multiplication to use check_mul_overflow() to\nabort processing the osdmap if an overflow occurred. Therefore,\nosdmaps/messages containing large values for len that result in a\nmultiplication overflow are treated as invalid.\n\n[ idryomov: rename new_state_len -\u003e new_state_item_size, formatting ]",
"id": "GHSA-jg8v-h49p-mvhw",
"modified": "2026-08-19T18:32:08Z",
"published": "2026-08-10T15:33:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68158"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/05c90e059269f087becfcce23348496085835c29"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/143ba49ead77ec483c0326f8aaad8649874e99c4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1732d89dfcd74f6fde9ce70900d316c4a151c153"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2ceee3b77b83052648c40fef965f836fd7699d26"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/98917a499ec7064c14fc56d180a4fd636fc2784c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bee4b5b53e7bff0467fd916cc44c9b190733c6bd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e4473751cc37db41f3f7da25d64a23e0c74570f1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f6961070c326bd158c38fa48756cde2bd78c4aaa"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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