High [CVE-2026-68343] validate DFS referral PathConsumed
This high-severity Red Hat Linux advisory covers CVE-2026-68343 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4.22.
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Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate DFS referral PathConsumed parse_dfs_referrals() validates that the response contains the fixed referral entry array and, on for-next, the per-referral string offsets. However, the response also contains a PathConsumed value that is later used for DFS path parsing.
Validate PathConsumed against the search name length before storing it in the parsed referral. A remote attacker could send a specially crafted SMB response containing a malformed Distributed File System (DFS) referral.
This could cause the PathConsumed value to exceed the search name length, leading to an out-of-bounds read during DFS path parsing. This vulnerability may result in information disclosure or a denial of service.
Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-805.
Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.22; Red Hat Enterprise Linux 10. Red Hat fixing advisory: RHSA-2026:64770, RHSA-2026:66000, RHSA-2026:57252, RHSA-2026:60440.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- kernel-rt-0:4.18.0-553.160.1.rt7.501.el8_10
- kernel-0:4.18.0-553.160.1.el8_10
- kernel-0:5.14.0-687.41.1.el9_8
- openshift/ose-rhel-coreos-9:4.22.9.8.202608251819-0
- RHSA-2026:64770
- RHSA-2026:66000
- RHSA-2026:57252
- RHSA-2026:60440
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-rt-0:4.18.0-553.160.1.rt7.501.el8_10, kernel-0:4.18.0-553.160.1.el8_10, kernel-0:5.14.0-687.41.1.el9_8, openshift/ose-rhel-coreos-9:4.22.9.8.202608251819-0, RHSA-2026:64770, RHSA-2026:66000. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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