CVE-2023-6606Kernel: out-of-bounds read vulnerability in smbcalcsize
- 7.1HighCVSS base score
- 0.53%Exploitation in 30 daysEPSS · top 55% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
Description
An out-of-bounds read vulnerability was found in smbCalcSize in fs/smb/client/netmisc.c in the Linux Kernel. This issue could allow a local attacker to crash the system or leak internal kernel information.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
Timeline
ID reserved
By redhat
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.53% · top 55% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
Red Hat · Red Hat Enterprise Linux 8
- unaffected 0:4.18.0-513.18.1.rt7.320.el8_9 – < *
Red Hat · Red Hat Enterprise Linux 8
- unaffected 0:4.18.0-513.18.1.el8_9 – < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support
- unaffected 0:4.18.0-372.95.1.el8_6 – < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support
- unaffected 0:4.18.0-477.51.1.el8_8 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:5.14.0-362.24.1.el9_3 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:5.14.0-362.24.1.el9_3 – < *
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support
- unaffected 0:5.14.0-284.52.1.el9_2 – < *
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support
- unaffected 0:5.14.0-284.52.1.rt14.337.el9_2 – < *
Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8
- unaffected 0:4.18.0-372.95.1.el8_6 – < *
- unaffected v5.8.6-22 – < *
- unaffected v5.8.6-11 – < *
- unaffected v6.8.1-407 – < *
- unaffected v5.8.6-19 – < *
- unaffected v1.0.0-479 – < *
- unaffected v5.8.6-7 – < *
- unaffected v0.4.0-247 – < *
- unaffected v5.8.6-5 – < *
- unaffected v1.1.0-227 – < *
- unaffected v5.8.1-470 – < *
- unaffected v2.9.6-14 – < *
- unaffected v5.8.6-2 – < *
- unaffected v5.8.6-24 – < *
- unaffected v5.8.6-10 – < *
- unaffected v0.1.0-525 – < *
- unaffected v0.1.0-224 – < *
- unaffected v0.28.1-56 – < *
Red Hat · Red Hat Enterprise Linux 6
All versions: unknown
Red Hat · Red Hat Enterprise Linux 7
All versions: unknown
Red Hat · Red Hat Enterprise Linux 7
All versions: unknown
Red Hat · Red Hat Enterprise Linux 9
All versions: affected
What to do
Workaround: To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
References
References15
- RHSA-2024:0723 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0725 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0881 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:0897 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:1188 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:1248 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:1404 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2024:2094 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://access.redhat.com/security/cve/CVE-2023-6606 (opens in a new tab)vdb-entryx_refsource_REDHATx_transferred
- https://bugzilla.kernel.org/show_bug.cgi?id=218218 (opens in a new tab)x_transferred
- RHBZ#2253611 (opens in a new tab)issue-trackingx_refsource_REDHATx_transferred
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-58829 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-6606)Record last updated .