CVE-2026-46243
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin. Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.38% probability · 31th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-825
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7Patch
- https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079Patch
- https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2Patch
- https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981Patch
- https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8Patch
- https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824Patch
- https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013dPatch
- https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbcPatch
- http://www.openwall.com/lists/oss-security/2026/06/01/6Mailing List, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:23258
- https://access.redhat.com/errata/RHSA-2026:23259
- https://access.redhat.com/errata/RHSA-2026:23329
- https://access.redhat.com/errata/RHSA-2026:23395
- https://access.redhat.com/errata/RHSA-2026:24381
- https://access.redhat.com/errata/RHSA-2026:25908
- https://access.redhat.com/errata/RHSA-2026:26462
- https://access.redhat.com/errata/RHSA-2026:26515
- https://access.redhat.com/errata/RHSA-2026:26535
- https://access.redhat.com/errata/RHSA-2026:26563
- https://access.redhat.com/errata/RHSA-2026:26570
- https://access.redhat.com/errata/RHSA-2026:27708
- https://access.redhat.com/errata/RHSA-2026:27719
- https://access.redhat.com/errata/RHSA-2026:27729
- https://access.redhat.com/errata/RHSA-2026:27735
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:28962
- https://access.redhat.com/errata/RHSA-2026:33219
- https://access.redhat.com/errata/RHSA-2026:33220
- https://access.redhat.com/errata/RHSA-2026:33221
- https://access.redhat.com/errata/RHSA-2026:33222
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.