Answer in brief
CVE-2026-99083 records a High severity (CVSS 8.8) vulnerability in ksmbd: fix heap out-of-bounds write in krb5_authenticate(). The current sources do not mark it as known exploited. The current feed maps 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 8.8. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <59c6dcc5dd9dafe764ca0d40525933b2be69b059 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <517404e157395d0f8da125ca956c566895dfcd06 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4722d06b2907585074252061b1024a696c1cfc23 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <23a0be6a84a38ac169eeab49017934e8e27c65f0 || >=0 <6.6.160 || >=0 <6.12.114 || >=0 <6.18.58 || >=0 <7.2.12 | 59c6dcc5dd9dafe764ca0d40525933b2be69b059, 80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a, 517404e157395d0f8da125ca956c566895dfcd06, 4722d06b2907585074252061b1024a696c1cfc23, 23a0be6a84a38ac169eeab49017934e8e27c65f0, 6.6.160, 6.12.114, 6.18.58, 7.2.12 |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix heap out-of-bounds write in krb5_authenticate() In krb5_authenticate(), out_len is calculated to determine available headroom in response_buf for the incoming Kerberos AP-REP token. However, when SMB2_SESSION_SETUP is processed as a non-first element of a compounded SMB2 request, the calculation omits work->next_smb2_rsp_hdr_off. This causes out_len to overstate remaining buffer headroom by the cumulative size of prior responses in the compound chain. Consequently, the length check in ksmbd_krb5_authenticate() (*out_len <= resp->spnego_blob_len) passes erroneously, allowing memcpy() to write the AP-REP blob past the end of response_buf into adjacent kernel heap memory. Fix this by subtracting work->next_smb2_rsp_hdr_off when computing out_len, ensuring it accurately reflects physical remaining buffer space.
Quoted source text, attributed separately from HOL analysis.