CVE-2026-99113ksmbd: zero the FS_OBJECT_ID_INFORMATION buffer before filling it in
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: zero the FS_OBJECT_ID_INFORMATION buffer before filling it in smb2_get_info_filesystem() reports 64 bytes for FS_OBJECT_ID_INFORMATION, that is the whole of struct object_id_info, but writes only 46 of them: - objid[] is 16 bytes, and when the volume UUID is not available only sizeof(stfs.f_fsid) (8) bytes are copied into it; - extended_info.version_string[] is STRING_LENGTH (28) bytes, and only strlen("1.1.0") (5) bytes are copied into it. The response buffer is zeroed on allocation (kvzalloc() in smb2_allocate_rsp_buf()), so for a standalone request the remaining 31 bytes are zero. In a compound request they need not be. The offset of the next response is advanced by the length pinned for the previous one, so if a preceding command wrote its reply into the buffer and then failed, smb2_set_err_rsp() pins only the short error response and the next reply lands inside the area that has already been written. Only the header is cleared there: memset((char *)rsp_hdr, 0, sizeof(struct smb2_hdr) + 2); The client then receives up to 31 bytes of a response it was not meant to see, including one that failed with an access denied error. Clear the structure before filling it in. As a side effect version_string is now NUL terminated.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 2 days later
· 2 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < dbd0f13de153d7094b85034daffa7533d7c2b17a
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 90898571fb2c6813c007a62833dd65c00481d44e
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 1a35a81c302b36fe4acd35b47b51d5d73e89ba0a
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 3fc33ac2125b60f103592b83821f69f3f9aa23ba
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 898cb4f2e12a5ddea1b2d821cc642c3100f46da7
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 015fffa48e96ca8d73a627445341ccff86b02251
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 399aa12450a61a5c73dc77e73f069ece9687c95d
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.161 – ≤ 6.6.*
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.59 – ≤ 6.18.*
- unaffected 7.2.13 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References7
- https://git.kernel.org/stable/c/dbd0f13de153d7094b85034daffa7533d7c2b17a (opens in a new tab)
- https://git.kernel.org/stable/c/90898571fb2c6813c007a62833dd65c00481d44e (opens in a new tab)
- https://git.kernel.org/stable/c/1a35a81c302b36fe4acd35b47b51d5d73e89ba0a (opens in a new tab)
- https://git.kernel.org/stable/c/3fc33ac2125b60f103592b83821f69f3f9aa23ba (opens in a new tab)
- https://git.kernel.org/stable/c/898cb4f2e12a5ddea1b2d821cc642c3100f46da7 (opens in a new tab)
- https://git.kernel.org/stable/c/015fffa48e96ca8d73a627445341ccff86b02251 (opens in a new tab)
- https://git.kernel.org/stable/c/399aa12450a61a5c73dc77e73f069ece9687c95d (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-112013 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-99113)Record last updated .