libceph: reset sparse-read state in osd_fault()

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: reset sparse-read state in osd_fault() When a fault occurs, the connection is abandoned, reestablished, and any pending operations are retried. The OSD client tracks the progress of a sparse-read reply using a separate state machine, largely independent of the messenger's state. If a connection is lost mid-payload or the sparse-read state machine returns an error, the sparse-read state is not reset. The OSD client will then interpret the beginning of a new reply as the continuation of the old one. If this makes the sparse-read machinery enter a failure state, it may never recover, producing loops like: libceph: [0] got 0 extents libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read Therefore, reset the sparse-read state in osd_fault(), ensuring retries start from a clean state.

Timeline

1. Feb 14, 2026, 3:22 PM UTCCVE published
2. Oct 16, 2026, 3:06 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 19, 2026, 6:25 PM UTCRecord last updated

Affected versions

• Linux Linux

  From f628d799972799023d32c2542bb2639eb8c4f84e · fixed in 90a60fe61908afa0eaf7f8fcf1421b9b50e5f7ff; From f628d799972799023d32c2542bb2639eb8c4f84e · fixed in e94075e950a6598e710b9f7dffea5aa388f40313; From f628d799972799023d32c2542bb2639eb8c4f84e · fixed in 10b7c72810364226f7b27916ea3e2a4f870bc04b; From f628d799972799023d32c2542bb2639eb8c4f84e · fixed in 11194b416ef95012c2cfe5f546d71af07b639e93

• Linux Linux

  6.6

• KernelLinux

  From 6.6.0 · fixed in 6.6.121; From 6.7.0 · fixed in 6.12.66; From 6.13.0 · fixed in 6.18.6

References 4