CVE-2026-68158

Received Received - Intake

BaseFortify

Publication date: 2026-08-10

Last updated on: 2026-10-19

Assigner: kernel.org

Description

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 ]

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Meta Information

Published

2026-08-10

Last Modified

2026-10-19

Generated

2026-11-08

AI Q&A

2026-08-10

EPSS Evaluated

2026-11-07

NVD

CVE-2026-68158

EUVD

EUVD-2026-55544

Affected Vendors & Products

Vendor	Product	Version / Range
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	930c532869774ebf8af9efe9484c597f896a7d46
Linux	Linux	1196c36fd53c3b1615eb02f986cb727b1dfc1047
Linux	Linux	bbc3aa6b0e6050b2b2e04a08dd4d6423d576b196
Linux	Linux	6b96b2d473701b45df3fea8dd9796b6ec39e6d54
Linux	Linux	7405d73cea0d0e6c541f5c534078feeb46188844
Linux	Linux	8777c9f654637d56f4c4ca54eb1bc7c609b70085
Linux	Linux	6831c98ce0b8a3e88db64aa224372effd0dcc694
Linux	Linux	032951d32c13b7564dfba82758260cb7aa1149d2
Linux	Linux	14877928f10667a5606383885d004f7185f33718
Linux	Linux	3.10.103
Linux	Linux	3.12.63
Linux	Linux	3.14.75
Linux	Linux	3.16.39
Linux	Linux	3.18.39
Linux	Linux	4.1.30
Linux	Linux	4.4.17
Linux	Linux	4.6.6
Linux	Linux	4.7

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves a multiplication overflow in the ceph library function decode_new_up_state_weight(). When processing a corrupted OSD map message, the function calculates the length of new_state incorrectly due to an overflow, leading to out-of-bounds memory access. The fix uses check_mul_overflow() to detect overflows and reject invalid messages.

Detection Guidance

This vulnerability involves corrupted CEPH_MSG_OSD_MAP messages triggering out-of-bounds memory access in the Linux kernel's libceph module. Detection requires monitoring for kernel logs indicating decode_new_up_state_weight() errors or osdmap corruption events. Check kernel logs with 'dmesg | grep ceph' or 'journalctl -k | grep ceph' for suspicious messages related to osdmap processing.

Impact Analysis

This vulnerability could allow attackers to trigger out-of-bounds memory reads by sending maliciously crafted CEPH_MSG_OSD_MAP messages. This may lead to crashes, data corruption, or potential privilege escalation in systems using the Linux kernel with ceph functionality.

Compliance Impact

This vulnerability involves out-of-bounds memory access due to a multiplication overflow in the Linux kernel's libceph component. It does not directly impact compliance with standards like GDPR or HIPAA, as those focus on data protection and privacy rather than kernel-level memory corruption issues.

Mitigation Strategies

Apply the kernel patch that replaces the vulnerable multiplication with check_mul_overflow() to prevent overflow-based out-of-bounds access. Update to a patched kernel version immediately. If patching is delayed, restrict network access to ceph services to trusted sources only as a temporary workaround.

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