CVE-2026-68343: smb: client: validate DFS referral PathConsumed
Vulnerability summary
CVE-2026-68343 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.7% of scored vulnerabilities.
Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 26 · Related 21Timeline
- 10-08-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
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. If a malformed response provides a PathConsumed value larger than the search name, later DFS parsing can advance beyond the end of the path. Validate PathConsumed against the search name length before storing it in the parsed referral.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- NVDNIST9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.51%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.51% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu168 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
- linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
- linux-6.12< 6.12.101-1~deb12u1
Linux1 product
- linux≥ 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < bfebe5110fd135d86d65a0a346e14c106b02028b | ≥ 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < 5b439f39f33ec15d319ced3b025e122346fba987 | ≥ 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < 285bd4a5f3f156aa5869843b47a1b1380b774241 | ≥ 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < 2fdd6d196c656b376cc251e1e9ff110b3ed522e1 | ≥ 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < 9f88a99ed511651b2dc2177d6854b2d1b8322e75 | ≥ 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < f6f5ee2aa33b350c671721b965251c42cebb962e | 4.11
3 vendors · 171 products
