{"apiVersion":"1.0","identifier":"CVE-2026-99083","description":"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.","publishedAt":"2026-10-23T13:17:32","lastModifiedAt":"2026-10-30T13:21:44","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-99083","cvssScore":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00445,"riskScore":0.92,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-99083","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-99083","en":"https://www.redsauce.net/en/cves/CVE-2026-99083","fr":"https://www.redsauce.net/fr/cves/CVE-2026-99083","pt":"https://www.redsauce.net/pt/cves/CVE-2026-99083","de":"https://www.redsauce.net/de/cves/CVE-2026-99083","sk":"https://www.redsauce.net/sk/cves/CVE-2026-99083","el":"https://www.redsauce.net/el/cves/CVE-2026-99083"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-99083"}}