8.8

CVE-2026-74522: ksmbd: fix use-after-free in __close_file_table_ids()

Received
AliasesUBUNTU-CVE-2026-74522DEBIAN-CVE-2026-74522
Published 15-08-2026Last modified 19-08-2026

Vulnerability summary

CVE-2026-74522 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 50.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.63%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
USN-8886-1USN-8959-1USN-8960-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in __close_file_table_ids() A ksmbd_file can remain alive after logical close while another session holds a temporary reference obtained through ksmbd_lookup_fd_inode(). ksmbd_close_fd() currently marks the file closed and drops the idr-owned reference, but leaves the pointer published in the closing session's idr until the final reference is dropped. If the foreign holder performs the final ksmbd_fd_put(), __put_fd_final() supplies the foreign session's file table to __ksmbd_close_fd(). The object is then freed without being removed from its owner's idr, and the owner session later dereferences the stale pointer during file-table teardown. Remove the volatile id from the owner's idr while ksmbd_close_fd() still holds that table's lock, and clear volatile_id before dropping the idr-owned reference. A later foreign final put then only performs physical destruction and cannot remove the object from the wrong table.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.63% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 7.0.0-42.42
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1016.17
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.8-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 8510a043d334ecdf83d4604782f288db6bf21d60, < 19bfd90d5aaf63217735d81964585c5306158e5f | ≥ 8510a043d334ecdf83d4604782f288db6bf21d60, < 67aaec2a1fdce3e1dde46c45b5d1ef8cf22f65cd | ≥ 8510a043d334ecdf83d4604782f288db6bf21d60, < 0c3918c2cee62ec6c9de8d5c73ebfe6f833961ac | ≥ 8510a043d334ecdf83d4604782f288db6bf21d60, < 9be4a66f019ea90bd9deca70511f4f9ffebf5c6f | ≥ 8510a043d334ecdf83d4604782f288db6bf21d60, < cffbdc86393b0235383a20c8c59bc32f16036459 | ≥ 8510a043d334ecdf83d4604782f288db6bf21d60, < e7188199eff46a636f3436356f0aae039be6dd66 | df30cbfd3d8a70e61ce59f63ce5ed2261799ac10 | aaf1d5ebb358f546414965b39da90107a7ca7ce5 | ≥ 5.15.38, < 5.16 | ≥ 5.17.6, < 5.18 | 5.18

3 vendors · 160 products

References

13 links
Show all 13 references