CVE-2023-52636
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
In the Linux kernel, a vulnerability in the libceph library can lead to incorrect data interpretation during a short read from the socket. The read_partial_sparse_msg_data() function may invoke the OSD client state machine, leading to bogus data. The fix reuses cursor->total_resid to determine whether to bail and wait for more data.
Risk Assessment
The vulnerability can cause errors in Ceph client operation, potentially leading to data corruption or malfunction of Ceph-based services. It may also cause system crashes.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2023-52636. Monitor security advisories and apply patches promptly.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: libceph: just wait for more data to be available on the socket A short read may occur while reading the message footer from the socket. Later, when the socket is ready for another read, the messenger invokes all read_partial_*() handlers, including read_partial_sparse_msg_data(). The expectation is that read_partial_sparse_msg_data() would bail, allowing the messenger to invoke read_partial() for the footer and pick up where it left off. However read_partial_sparse_msg_data() violates that and ends up calling into the state machine in the OSD client. The sparse-read state machine assumes that it's a new op and interprets some piece of the footer as the sparse-read header and returns bogus extents/data length, etc. To determine whether read_partial_sparse_msg_data() should bail, let's reuse cursor->total_resid. Because once it reaches to zero that means all the extents and data have been successfully received in last read, else it could break out when partially reading any of the extents and data. And then osd_sparse_read() could continue where it left off. [ idryomov: changelog ]