CVE-2026-68433

Summary

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

VendorProductVersion RangeStatus
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < 1307028f082756bf453e1889aee9983d30643a4baffected
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2eaffected
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < 72a35070fcefa229b1b031aa7482ad3788e18f07affected
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < 340e0386aa39da181015bee38f309018c335ce16affected
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < d60de8253c85a02d0e6194b0735e7a562981a04caffected
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < 4e7ebfaa0d14cf50e44041bfde38070d6dbc019faffected
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < 0d934c934ec746d53fc7e4f53239792647bbae63affected
LinuxLinux513a8243d67f8e8d27f2883bd2f18bc87c7ca376 < d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0affected
LinuxLinux3.16affected
LinuxLinux0 < 3.16unaffected
LinuxLinux5.10.265 <= 5.10.*unaffected
LinuxLinux5.15.216 <= 5.15.*unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References