CVE-2026-43185
CRITICAL
INFO
Priority: 0.08
BB Relevance:
80/100
Published: 2026-05-06
Modified: 2026-10-30
First seen: 2026-10-30
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
Description
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)
Weakness Classification (1)
Affected Software (9)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf < 1c268fd2f59dc9ccb2c2a7d1f439b232dbe1c06c |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf < 56eab82fa6fb5ca024b0514e249d40d9b23ee5a7 |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf < a110dbe928561d440e9e117d17331139a0bedace |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf < ceae058eb707ddd0d68f0872f9d9f23b7c30c37b |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf < 55abc475d096da4a5356b6efb0cfdc6156bc1550 |
| Linux | Linux | 0626e6641f6b467447c81dd7678a69c66f7746cf < 6b4f875aac344cdd52a1f34cc70ed2f874a65757 |
| Linux | Linux | 5.15 |
| linux | linux_kernel | 5.15 – 6.18.16 |
| linux | linux_kernel | 7.0 |