9.1

CVE-2026-68083: linux

CVSS: 9.1v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-68083DEBIAN-CVE-2026-68083
Published 10-08-2026Last modified 17-08-2026
Open JSON

Vulnerability summary

CVE-2026-68083 is a critical (CVSS 9.1) vulnerability in linux. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.9% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.44%
0%100%
Low · -0.01 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-8781-1USN-8816-1USN-8816-2USN-8816-3

Timeline

  1. 10-08-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix path resolution in ksmbd_vfs_kern_path_create The SMB2 open lookup is rooted at the share with LOOKUP_BENEATH, but the create/mkdir/hardlink sink is not: ksmbd_vfs_kern_path_create() builds an absolute path with convert_to_unix_name() and resolves it from AT_FDCWD via start_creating_path(), so a ".." component is walked from the real filesystem root and escapes the export. An authenticated client races a missing path component so the rooted open lookup returns -ENOENT (taking the create branch) while the same component is present (a directory) when the create walk runs; the create then resolves ".." out of the share. Root the create walk at the share like the lookup and rename paths already are: resolve the parent with vfs_path_parent_lookup(..., LOOKUP_BENEATH, &share_conf->vfs_path) and create the final component with start_creating_noperm(). convert_to_unix_name() then has no callers and is removed.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

-0.01 pp

From 0.45% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.44%

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

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-34.34
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1013.13
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.100-1 | < 7.1.5-1
Linux1 product
  • linux≥ 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < 489d1ded01425c0fb33418172c0e4e588467526b | ≥ 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < c7c884a1305aa4540eb7942a50bd356b34120e1f | ≥ 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < 98185b3025beeae92d1fe700d5db26b9ac4bf025 | ≥ 265fd1991c1db85fbabaad4946ca0e63e2ae688d, < 1c8951963d8ed357f70f59e0ad4ddce2199d2016 | 5.15

3 vendors · 159 products

References

16 links
Show all 16 references