Answer in brief
CVE-2026-43185 records a Critical severity (CVSS 9.8) vulnerability in ksmbd: fix signededness bug in smb_direct_prepare_negotiation(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <ceae058eb707ddd0d68f0872f9d9f23b7c30c37b || >=0626e6641f6b467447c81dd7678a69c66f7746cf <55abc475d096da4a5356b6efb0cfdc6156bc1550 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <6b4f875aac344cdd52a1f34cc70ed2f874a65757 | ceae058eb707ddd0d68f0872f9d9f23b7c30c37b, 55abc475d096da4a5356b6efb0cfdc6156bc1550, 6b4f875aac344cdd52a1f34cc70ed2f874a65757 |
| Linux/Linuxgeneric | 5.15 | Not reported |
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <56eab82fa6fb5ca024b0514e249d40d9b23ee5a7 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <a110dbe928561d440e9e117d17331139a0bedace || >=0626e6641f6b467447c81dd7678a69c66f7746cf <ceae058eb707ddd0d68f0872f9d9f23b7c30c37b || >=0626e6641f6b467447c81dd7678a69c66f7746cf <55abc475d096da4a5356b6efb0cfdc6156bc1550 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <6b4f875aac344cdd52a1f34cc70ed2f874a65757 | 56eab82fa6fb5ca024b0514e249d40d9b23ee5a7, a110dbe928561d440e9e117d17331139a0bedace, ceae058eb707ddd0d68f0872f9d9f23b7c30c37b, 55abc475d096da4a5356b6efb0cfdc6156bc1550, 6b4f875aac344cdd52a1f34cc70ed2f874a65757 |
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <1c268fd2f59dc9ccb2c2a7d1f439b232dbe1c06c || >=0626e6641f6b467447c81dd7678a69c66f7746cf <56eab82fa6fb5ca024b0514e249d40d9b23ee5a7 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <a110dbe928561d440e9e117d17331139a0bedace || >=0626e6641f6b467447c81dd7678a69c66f7746cf <ceae058eb707ddd0d68f0872f9d9f23b7c30c37b || >=0626e6641f6b467447c81dd7678a69c66f7746cf <55abc475d096da4a5356b6efb0cfdc6156bc1550 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <6b4f875aac344cdd52a1f34cc70ed2f874a65757 | 1c268fd2f59dc9ccb2c2a7d1f439b232dbe1c06c, 56eab82fa6fb5ca024b0514e249d40d9b23ee5a7, a110dbe928561d440e9e117d17331139a0bedace, ceae058eb707ddd0d68f0872f9d9f23b7c30c37b, 55abc475d096da4a5356b6efb0cfdc6156bc1550, 6b4f875aac344cdd52a1f34cc70ed2f874a65757 |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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)
Quoted source text, attributed separately from HOL analysis.