CVE-2026-68433

libceph: bound get_version reply decode to front len

State: Published
Severity: 8.6 High
Published: Aug 12, 2026
Updated: Oct 19, 2026
Reserved: Jul 30, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

libceph: bound get_version reply decode to front len

handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received.

A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read.

Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H	Linux

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 1307028f082756bf453e1889aee9983d30643a4bAffected 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2eAffected 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 72a35070fcefa229b1b031aa7482ad3788e18f07Affected 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 340e0386aa39da181015bee38f309018c335ce16Affected 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before d60de8253c85a02d0e6194b0735e7a562981a04cAffected 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 4e7ebfaa0d14cf50e44041bfde38070d6dbc019fAffected 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 0d934c934ec746d53fc7e4f53239792647bbae63Affected 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0Affected
LinuxLinux	3.16Affected before 3.16Not 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

513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 1307028f082756bf453e1889aee9983d30643a4bAffected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2eAffected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 72a35070fcefa229b1b031aa7482ad3788e18f07Affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 340e0386aa39da181015bee38f309018c335ce16Affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before d60de8253c85a02d0e6194b0735e7a562981a04cAffected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 4e7ebfaa0d14cf50e44041bfde38070d6dbc019fAffected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before 0d934c934ec746d53fc7e4f53239792647bbae63Affected
513a8243d67f8e8d27f2883bd2f18bc87c7ca376 to before d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0Affected

LinuxLinux

3.16Affected
before 3.16Not 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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