CVE-2026-68158

In 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 ]

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/05c90e059269f087becfcce23348496085835c29
https://git.kernel.org/stable/c/143ba49ead77ec483c0326f8aaad8649874e99c4
https://git.kernel.org/stable/c/1732d89dfcd74f6fde9ce70900d316c4a151c153
https://git.kernel.org/stable/c/2ceee3b77b83052648c40fef965f836fd7699d26
https://git.kernel.org/stable/c/98917a499ec7064c14fc56d180a4fd636fc2784c
https://git.kernel.org/stable/c/bee4b5b53e7bff0467fd916cc44c9b190733c6bd
https://git.kernel.org/stable/c/e4473751cc37db41f3f7da25d64a23e0c74570f1
https://git.kernel.org/stable/c/f6961070c326bd158c38fa48756cde2bd78c4aaa

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-10 13:20

Updated : 2026-08-19 17:20

NVD link : CVE-2026-68158

Mitre link : CVE-2026-68158

CVE.ORG link : CVE-2026-68158

JSON object : View

Products Affected

No product.

CWE

No CWE.

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"Received", "descriptions": [{"lang": "en", "value": "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 -> new_state_item_size, formatting ]"}], "lastModified": "2026-08-19T17:20:33.133", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}