CVE-2026-43185
- Source
- https://cve.org/CVERecord?id=CVE-2026-43185
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43185.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-43185
- Downstream
BELL (1)
DEBIAN (1)
ROOT (4)
- Published
- 2026-05-06T11:27:56Z
- Modified
- 2026-11-01T02:35:52Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
smb_direct_prepare_negotiation() casts an unsigned __u32 value from sp->max_recv_size and req->preferred_send_size to a signed int before computing min_t(int, ...). A maliciously provided preferred_send_size of 0x80000000 will return as smaller than max_recv_size, and then be used to set the maximum allowed alowed receive size for the next message.
By sending a second message with a large value (>1420 bytes) the attacker can then achieve a heap buffer overflow.
This fix replaces min_t(int, ...) with min_t(u32)
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43185.json" }- References
-
- https://git.kernel.org/stable/c/1c268fd2f59dc9ccb2c2a7d1f439b232dbe1c06c
- https://git.kernel.org/stable/c/55abc475d096da4a5356b6efb0cfdc6156bc1550
- https://git.kernel.org/stable/c/56eab82fa6fb5ca024b0514e249d40d9b23ee5a7
- https://git.kernel.org/stable/c/6b4f875aac344cdd52a1f34cc70ed2f874a65757
- https://git.kernel.org/stable/c/a110dbe928561d440e9e117d17331139a0bedace
- https://git.kernel.org/stable/c/ceae058eb707ddd0d68f0872f9d9f23b7c30c37b
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43185.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-43185
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0626e6641f6b467447c81dd7678a69c66f7746cfFixed1c268fd2f59dc9ccb2c2a7d1f439b232dbe1c06cFixed56eab82fa6fb5ca024b0514e249d40d9b23ee5a7Fixeda110dbe928561d440e9e117d17331139a0bedaceFixedceae058eb707ddd0d68f0872f9d9f23b7c30c37bFixed55abc475d096da4a5356b6efb0cfdc6156bc1550Fixed6b4f875aac344cdd52a1f34cc70ed2f874a65757
Linux / Kernel
Package
- Name
- Kernel