CVE-2026-89655Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock list_for_each_entry() iterates ci->i_cap_flush_list but drops i_ceph_lock to send cap messages.…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.3
none → medium
— → 9.8
none → critical
9.8 → 5.3
critical → medium
5.3 → 9.8
medium → critical
9.8 → 7
critical → high
0.2% → 0.8%
7 → 9.8
high → critical
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
list_for_each_entry() iterates ci->i_cap_flush_list but drops i_ceph_lock to send cap messages. During the unlock window, handle_cap_flush_ack() can acquire i_ceph_lock, detach cf entries with tid <= flush_tid from the list, release i_ceph_lock, and free them via ceph_free_cap_flush() outside any lock. When the original thread reacquires i_ceph_lock and the for-loop macro advances via cf = list_next_entry(cf, i_list), it dereferences cf->i_list.next on freed memory.
The race timeline:
__kick_flushing_caps() handle_cap_flush_ack()
holds i_ceph_lock <--- iterates to cf (tid=10) prepares FLUSH message drops i_ceph_lock <--- __send_cap() ── FLUSH(tid=10) MDS sends FLUSH_ACK(tid=10) ---> acquires i_ceph_lock cf->tid(10) <= flush_tid(10), detaches cf from i_cap_flush_list drops i_ceph_lock ceph_free_cap_flush(cf) <- frees it! acquires i_ceph_lock <--- for-loop advances: cf = list_next_entry(cf, i_list) -- UAF on freed cf->i_list.next
The cf was just sent by __kick_flushing_caps itself via __send_cap(). The MDS may respond with FLUSH_ACK quickly enough that handle_cap_flush_ack() frees cf before __kick_flushing_caps can finish the iteration.
Fix by converting to a manual while loop: save the next pointer under i_ceph_lock before dropping it, then use the saved pointer after reacquiring, so the potentially-freed cf is never accessed again.
Linux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < 091137821e1fc88f37e15201abf055c9494ddc61Linux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < 01542430081014d80fc9e70e92d6647432ddb7fcLinux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < 23eb34a53a53cb1a6dab1eeee830633207ac158dLinux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < 19f16f04c2b014a7dd214dc1e42557d8530b16f3Linux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < 2701431aa3cc8b23efe6890182e7b04f5e76fab5Linux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < fe46746087b5b9c5bb2d022df6c7819218494cedLinux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < 2dba24dcd5050be4b7b119e6f0b01f62203b5d26Linux >= e4500b5e35c213e0f97be7cb69328c0877203a79 < 7af4c4f01305b0935adf6d4301b1ec407025485dLinux 4.8Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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