# CVE-2023-52636: linux: In the Linux kernel, the following vulnerability has been resolved:  libceph: just wait for more data to be available...

CVE-2023-52636 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52636, released April 2, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52636
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0052
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 2, 2024

## Description

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 ]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.7.7-1 | [DEBIAN-CVE-2023-52636](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52636.md) | Apr 2, 2024 |
| Linux | linux Debian 14 | 6.7.7-1 | [DEBIAN-CVE-2023-52636](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52636.md) | Apr 2, 2024 |

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