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A vulnerability in the Linux kernel's libceph component was resolved by ensuring the calc_target() function properly sets the t->paused flag, not just clears it. The flaw caused watches to not be reestablished on paused-to-unpaused transitions for linger requests, potentially leading to deadlocks and stuck mutexes. This issue was fixed in updated Linux kernel versions. The vulnerability is rated medium severity and no known exploits are reported in the wild. Multiple Linux kernel subsystems had other security fixes in the same update. Users should update to the fixed kernel versions and reboot to apply the patches.

The vulnerability in the Linux kernel's libceph library involved the calc_target() function failing to set the t->paused flag for linger requests, although it cleared it when requests should no longer be paused. Since __submit_request() does not operate on linger requests, the t->paused flag was never set for these, causing watches not to be reestablished after a paused-to-unpaused transition. This could cause rbd_reregister_watch() to deadlock with the watch_mutex held. The issue was fixed by modifying calc_target() to set t->paused appropriately. This fix is part of a broader Linux kernel security update addressing multiple subsystems and vulnerabilities. The patch is available and users are advised to update their kernels accordingly.

Detailed information about UBUNTU-CVE-2026-23047 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23047 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: libceph: make calc_target() set t->paused, not just clear it Currently… (CVE-2026-23047)

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