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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-43185

ksmbd: fix signededness bug in smb_direct_prepare_negotiation()

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Status
Published
Published
Updated
Assigning organization
Linux

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)

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 0626e6641f6b467447c81dd7678a69c66f7746cf to < 1c268fd2f59dc9ccb2c2a7d1f439b232dbe1c06caffected
  • 0626e6641f6b467447c81dd7678a69c66f7746cf to < 56eab82fa6fb5ca024b0514e249d40d9b23ee5a7affected
  • 0626e6641f6b467447c81dd7678a69c66f7746cf to < a110dbe928561d440e9e117d17331139a0bedaceaffected
  • 0626e6641f6b467447c81dd7678a69c66f7746cf to < ceae058eb707ddd0d68f0872f9d9f23b7c30c37baffected
  • 0626e6641f6b467447c81dd7678a69c66f7746cf to < 55abc475d096da4a5356b6efb0cfdc6156bc1550affected
  • 0626e6641f6b467447c81dd7678a69c66f7746cf to < 6b4f875aac344cdd52a1f34cc70ed2f874a65757affected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.16 to ≤ 6.18.*unaffected
  • 6.19.6 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References