01 Record

CVE-2026-89655

ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.71% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 53.1% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Received. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-09-11 19:45Z1 MO AGO

Last updated

2026-10-19 08:50Z10 DAYS AGO

Reserved

2026-09-11

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-366Race Condition within a ThreadBase
CWE-416Use After FreeVariant

Data version

5.2

Document digest

4e9e01be1e0cc1c101a814c2f4ac7733a75a2620714525ead290098714a107ad

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxe4500b5e35c213e0f97be7cb69328c0877203a79 to < 091137821e1fc88f37e15201abf055c9494ddc61, e4500b5e35c213e0f97be7cb69328c0877203a79 to < 01542430081014d80fc9e70e92d6647432ddb7fc, e4500b5e35c213e0f97be7cb69328c0877203a79 to < 23eb34a53a53cb1a6dab1eeee830633207ac158d, e4500b5e35c213e0f97be7cb69328c0877203a79 to < 19f16f04c2b014a7dd214dc1e42557d8530b16f3, e4500b5e35c213e0f97be7cb69328c0877203a79 to < 2701431aa3cc8b23efe6890182e7b04f5e76fab5, e4500b5e35c213e0f97be7cb69328c0877203a79 to < fe46746087b5b9c5bb2d022df6c7819218494ced, e4500b5e35c213e0f97be7cb69328c0877203a79 to < 2dba24dcd5050be4b7b119e6f0b01f62203b5d26, e4500b5e35c213e0f97be7cb69328c0877203a79 to < 7af4c4f01305b0935adf6d4301b1ec407025485d, 4.8—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/091137821e1fc88f37e15201abf055c9494ddc61
git.kernel.orghttps://git.kernel.org/stable/c/01542430081014d80fc9e70e92d6647432ddb7fc
git.kernel.orghttps://git.kernel.org/stable/c/23eb34a53a53cb1a6dab1eeee830633207ac158d
git.kernel.orghttps://git.kernel.org/stable/c/19f16f04c2b014a7dd214dc1e42557d8530b16f3
git.kernel.orghttps://git.kernel.org/stable/c/2701431aa3cc8b23efe6890182e7b04f5e76fab5
git.kernel.orghttps://git.kernel.org/stable/c/fe46746087b5b9c5bb2d022df6c7819218494ced
git.kernel.orghttps://git.kernel.org/stable/c/2dba24dcd5050be4b7b119e6f0b01f62203b5d26
git.kernel.orghttps://git.kernel.org/stable/c/7af4c4f01305b0935adf6d4301b1ec407025485d

07 Fixed in

Debian 12

linux
Fixed in 6.1.190-1
linux-6.12
Fixed in 6.12.111-1~deb12u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.111-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 7.2.6-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.