8.8

CVE-2026-68097: linux

CVSS: 8.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-68097DEBIAN-CVE-2026-68097
Published 10-08-2026Last modified 03-10-2026
Open JSON

Vulnerability summary

CVE-2026-68097 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.5% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.45%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 9
MGASA-2026-0336MGASA-2026-0337USN-8886-1USN-8887-1USN-8887-2USN-8887-3

Timeline

  1. 10-08-2026
    PublishedVulnerability first disclosed.
  2. 03-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate ACE size against SID sub-authorities set_ntacl_dacl() validates sid.num_subauth before copying an ACE, but does not verify that the declared ACE size contains all sub-authorities described by that field. An undersized ACE can therefore be copied and later make the POSIX ACL deduplication walk inspect data beyond the copied ACE boundary. The existing initial bound check is also too small. It only ensures that the ACE size field is accessible before set_ntacl_dacl() reads sid.num_subauth farther into the input buffer. Require enough input for the fixed SID header before accessing num_subauth, reject ACEs smaller than that header, and skip ACEs whose declared size cannot contain the complete SID. This makes the validation consistent with the other ACE walk paths.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

+0.03 pp

From 0.41% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.45%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.101-1 | < 7.1.6-1
  • linux-6.12< 6.12.101-1~deb12u1
Linux1 product
  • linux≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 5a2d9fe0e87c71baa0aaa1cfc1361892fcd1ece0 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < b7cb5bf0855470799f12da825de91e48951b3876 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 62d80d7c2d9428085e7458ad4c06ca8c0984039b | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 337022d9dfac441c3b35e4455a51aa981996e02e | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 61fd3559199f7fa693dcbff35e59477e24af041a | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 5152c6d49e3fd4e9f2e857c57527aead752f1f87 | 5.15

3 vendors · 172 products

References

19 links
Show all 19 references