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CVE-2026-68433

Unknown

Last modified

CVE-2026-68433 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 513a8243d67f8e8d27f2883bd2f18bc87c7ca376, < 340e0386aa39da181015bee38f309018c335ce16; >= 513a8243d67f8e8d27f2883bd2f18bc87c7ca376, < d60de8253c85a02d0e6194b0735e7a562981a04c; >= 513a8243d67f8e8d27f2883bd2f18bc87c7ca376, < 4e7ebfaa0d14cf50e44041bfde38070d6dbc019f; >= 513a8243d67f8e8d27f2883bd2f18bc87c7ca376, < 0d934c934ec746d53fc7e4f53239792647bbae63; >= 513a8243d67f8e8d27f2883bd2f18bc87c7ca376, < d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0
LinuxLinux3.16

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-68433?
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.
How severe is CVE-2026-68433?
Severity scoring for CVE-2026-68433 is pending analysis.
How do I fix CVE-2026-68433?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST