CVE-2026-68158

libceph: Fix multiplication overflow in decode_new_up_state_weight()

State: Published
Severity: 9.8 Critical
Published: Aug 10, 2026
Updated: Oct 19, 2026
Reserved: Jul 30, 2026

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 ]

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
LinuxLinux	930c532869774ebf8af9efe9484c597f896a7d46 to before 2ceee3b77b83052648c40fef965f836fd7699d26Affected 930c532869774ebf8af9efe9484c597f896a7d46 to before e4473751cc37db41f3f7da25d64a23e0c74570f1Affected 930c532869774ebf8af9efe9484c597f896a7d46 to before f6961070c326bd158c38fa48756cde2bd78c4aaaAffected 930c532869774ebf8af9efe9484c597f896a7d46 to before 05c90e059269f087becfcce23348496085835c29Affected 930c532869774ebf8af9efe9484c597f896a7d46 to before 143ba49ead77ec483c0326f8aaad8649874e99c4Affected 930c532869774ebf8af9efe9484c597f896a7d46 to before 1732d89dfcd74f6fde9ce70900d316c4a151c153Affected 930c532869774ebf8af9efe9484c597f896a7d46 to before bee4b5b53e7bff0467fd916cc44c9b190733c6bdAffected 930c532869774ebf8af9efe9484c597f896a7d46 to before 98917a499ec7064c14fc56d180a4fd636fc2784cAffected 1196c36fd53c3b1615eb02f986cb727b1dfc1047Affected bbc3aa6b0e6050b2b2e04a08dd4d6423d576b196Affected 6b96b2d473701b45df3fea8dd9796b6ec39e6d54Affected 7405d73cea0d0e6c541f5c534078feeb46188844Affected 8777c9f654637d56f4c4ca54eb1bc7c609b70085Affected 6831c98ce0b8a3e88db64aa224372effd0dcc694Affected 032951d32c13b7564dfba82758260cb7aa1149d2Affected 14877928f10667a5606383885d004f7185f33718Affected 3.10.103 to before 3.11Affected 3.12.63 to before 3.13Affected 3.14.75 to before 3.15Affected 3.16.39 to before 3.17Affected 3.18.39 to before 3.19Affected 4.1.30 to before 4.2Affected 4.4.17 to before 4.5Affected 4.6.6 to before 4.7Affected
LinuxLinux	4.7Affected before 4.7Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.148 through 6.6.Not affected 6.12.101 through 6.12.Not affected 6.18.42 through 6.18.Not affected 7.1.6 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

930c532869774ebf8af9efe9484c597f896a7d46 to before 2ceee3b77b83052648c40fef965f836fd7699d26Affected
930c532869774ebf8af9efe9484c597f896a7d46 to before e4473751cc37db41f3f7da25d64a23e0c74570f1Affected
930c532869774ebf8af9efe9484c597f896a7d46 to before f6961070c326bd158c38fa48756cde2bd78c4aaaAffected
930c532869774ebf8af9efe9484c597f896a7d46 to before 05c90e059269f087becfcce23348496085835c29Affected
930c532869774ebf8af9efe9484c597f896a7d46 to before 143ba49ead77ec483c0326f8aaad8649874e99c4Affected
930c532869774ebf8af9efe9484c597f896a7d46 to before 1732d89dfcd74f6fde9ce70900d316c4a151c153Affected
930c532869774ebf8af9efe9484c597f896a7d46 to before bee4b5b53e7bff0467fd916cc44c9b190733c6bdAffected
930c532869774ebf8af9efe9484c597f896a7d46 to before 98917a499ec7064c14fc56d180a4fd636fc2784cAffected
1196c36fd53c3b1615eb02f986cb727b1dfc1047Affected
bbc3aa6b0e6050b2b2e04a08dd4d6423d576b196Affected
6b96b2d473701b45df3fea8dd9796b6ec39e6d54Affected
7405d73cea0d0e6c541f5c534078feeb46188844Affected
8777c9f654637d56f4c4ca54eb1bc7c609b70085Affected
6831c98ce0b8a3e88db64aa224372effd0dcc694Affected
032951d32c13b7564dfba82758260cb7aa1149d2Affected
14877928f10667a5606383885d004f7185f33718Affected
3.10.103 to before 3.11Affected
3.12.63 to before 3.13Affected
3.14.75 to before 3.15Affected
3.16.39 to before 3.17Affected
3.18.39 to before 3.19Affected
4.1.30 to before 4.2Affected
4.4.17 to before 4.5Affected
4.6.6 to before 4.7Affected

LinuxLinux

4.7Affected
before 4.7Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.148 through 6.6.*Not affected
6.12.101 through 6.12.*Not affected
6.18.42 through 6.18.*Not affected
7.1.6 through 7.1.*Not affected
7.2 and laterNot affected

References

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