CVE-2025-37778ksmbd: Fix dangling pointer in krb_authenticate
- 9.8CriticalCVSS base score
- 1.2%Exploitation in 30 daysEPSS · top 32% 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: Fix dangling pointer in krb_authenticate krb_authenticate frees sess->user and does not set the pointer to NULL. It calls ksmbd_krb5_authenticate to reinitialise sess->user but that function may return without doing so. If that happens then smb2_sess_setup, which calls krb_authenticate, will be accessing free'd memory when it later uses sess->user.
Timeline
ID reserved
By Linux
- 15 days later
· 15 days later
Published
- 18 months later
· 18 months 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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.2% · top 32% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 0626e6641f6b467447c81dd7678a69c66f7746cf – < b61f04d5d73c53d183019bafe22fb700a739bac5
- affected 0626e6641f6b467447c81dd7678a69c66f7746cf – < d5b554bc8d554ed6ddf443d3db2fad9f665cec10
- affected 0626e6641f6b467447c81dd7678a69c66f7746cf – < 1db2451de23e98bc864c6a6e52aa0d82c91cb325
- affected 0626e6641f6b467447c81dd7678a69c66f7746cf – < 6e30c0e10210c714f3d4453dc258d4abcc70364e
- affected 0626e6641f6b467447c81dd7678a69c66f7746cf – < e83e39a5f6a01a81411a4558a59a10f87aa88dd6
- affected 0626e6641f6b467447c81dd7678a69c66f7746cf – < 1e440d5b25b7efccb3defe542a73c51005799a5f
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.135 – ≤ 6.1.*
- unaffected 6.6.88 – ≤ 6.6.*
- unaffected 6.12.25 – ≤ 6.12.*
- unaffected 6.14.4 – ≤ 6.14.*
- unaffected 6.15 – ≤ *
References
References7
- https://git.kernel.org/stable/c/b61f04d5d73c53d183019bafe22fb700a739bac5 (opens in a new tab)
- https://git.kernel.org/stable/c/d5b554bc8d554ed6ddf443d3db2fad9f665cec10 (opens in a new tab)
- https://git.kernel.org/stable/c/1db2451de23e98bc864c6a6e52aa0d82c91cb325 (opens in a new tab)
- https://git.kernel.org/stable/c/6e30c0e10210c714f3d4453dc258d4abcc70364e (opens in a new tab)
- https://git.kernel.org/stable/c/e83e39a5f6a01a81411a4558a59a10f87aa88dd6 (opens in a new tab)
- https://git.kernel.org/stable/c/1e440d5b25b7efccb3defe542a73c51005799a5f (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html (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-2025-13044 (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)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-37778)Record last updated .