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.
Affected versions
Linux kernel versions
3.16
and later are affected. Fixed in
6.6.148,
6.12.101,
6.18.42,
7.1.6,
7.2-rc5
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-68433?
CVE-2026-68433 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.16 onward and has been patched in 6.6.148, 6.12.101, 6.18.42 and others. CVE-2026-68433 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-68433?
Yes. CVE-2026-68433 has been patched. Fixed versions include 6.6.148, 6.12.101, 6.18.42 and others. If you are running Linux kernel 3.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-68433 actively exploited?
No. CVE-2026-68433 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.