by Kastro
Paper/Archive/CVE-2026-89636

CVE-2026-89636

Linux Linux — smb: client: clear ce->tgthint in free_tgts()

EPSS 0.7%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 51.6.516 × 2010.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In the Linux kernel, the following vulnerability has been resolved: smb: client: clear ce->tgthint in free_tgts() When free_tgts() frees all structures in ce->tlist, ce->tgthint is left pointing to one of the freed cache_dfs_tgt structures. If ce->tgthint is not reset before it is used later, it results in a use-after-free. Set ce->tgthint to NULL in free_tgts() after the elements are freed to reflect that no elements remain.

Affected

ProductAffectedFixed inSource
Linux54be1f6c1c37498bba557049df646cc239fa37e3 – < 14f60e959b5ac813715ff72e127beb3584ddabf614f60e959b5ac813715ff72e127beb3584ddabf6CNA
Linux54be1f6c1c37498bba557049df646cc239fa37e3 – < 3ff9462bb7a06d8d32a1dc02d39580b078ec9e553ff9462bb7a06d8d32a1dc02d39580b078ec9e55CNA
Linux54be1f6c1c37498bba557049df646cc239fa37e3 – < 7507bd1885643d0461a6017767492450af1ce2a37507bd1885643d0461a6017767492450af1ce2a3CNA
Linux54be1f6c1c37498bba557049df646cc239fa37e3 – < 9ab46a13798a61d9d020b01d4e57efdabe6624fa9ab46a13798a61d9d020b01d4e57efdabe6624faCNA
Linux54be1f6c1c37498bba557049df646cc239fa37e3 – < 5baab40404a9393bcc0b7b8f1950bf2c307e09845baab40404a9393bcc0b7b8f1950bf2c307e0984CNA
Linux54be1f6c1c37498bba557049df646cc239fa37e3 – < b1b741cf8e7ce1b91d937e23decd3d3358748700b1b741cf8e7ce1b91d937e23decd3d3358748700CNA
Linux5.0–CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgit.kernel.org/stable/c/14f60e959b5ac813715ff72e127beb3584ddabf6refgit.kernel.org/stable/c/3ff9462bb7a06d8d32a1dc02d39580b078ec9e55refgit.kernel.org/stable/c/7507bd1885643d0461a6017767492450af1ce2a3refgit.kernel.org/stable/c/9ab46a13798a61d9d020b01d4e57efdabe6624farefgit.kernel.org/stable/c/5baab40404a9393bcc0b7b8f1950bf2c307e0984refgit.kernel.org/stable/c/b1b741cf8e7ce1b91d937e23decd3d3358748700