smb: client: reject userspace cifs.spnego descriptions
Noroxi assessment
Priority: Monitor (action score 28/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.37% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 0aece6685fc80a8de492688ca2315fb86ec379c7, 2035acfb17221729b1b8ac335e941868a04ca079, 3da1fdf4efbc490041eb4f836bf596201203f8f2; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 0aece6685fc80a8de492688ca2315fb86ec379c7, 2035acfb17221729b1b8ac335e941868a04ca079, 3da1fdf4efbc490041eb4f836bf596201203f8f2; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- BDU:2026-07574
- ALSA-2026:23258
- ALSA-2026:23259
- ALSA-2026:23329
- ALSA-2026:24381
- RHSA-2026:23258
- RHSA-2026:23259
- RHSA-2026:23329
- RHSA-2026:23395
- RHSA-2026:24381
- RHSA-2026:25908
- RHSA-2026:26515
- RHSA-2026:26563
- RHSA-2026:26570
- RHSA-2026:27708
- RHSA-2026:27719
- RHSA-2026:27729
- RHSA-2026:27735
- RHSA-2026:33219
- RHSA-2026:33220
- Published
- Jun 1, 2026
- Updated
- Oct 15, 2026
- EPSS
- 0.3% · 30th percentile
- CWE
- CWE-20
Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.1
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel2.6.24.1 and later · before 5.10.258
- linux linux kernel5.11 and later · before 5.15.209
- linux linux kernel5.16 and later · before 6.1.175
- linux linux kernel6.2 and later · before 6.6.142
- linux linux kernel6.7 and later · before 6.12.92
- linux linux kernel6.13 and later · before 6.18.34
- linux linux kernel6.19 and later · before 7.0.11
- linux linux kernel2.6.24
- linux linux kernel7.1
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.24affected
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before 7713bd320ed4fc3d08a227cd8e41242219a16981affected · git
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before 9544559e59438a4b609b2fdfa0763d8360572824affected · git
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before cf20038657d6d4974349556a34e08fe0490bebbcaffected · git
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before 2035acfb17221729b1b8ac335e941868a04ca079affected · git
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before a3bbda6502a9398b816fa2e71c9a3f955f58013daffected · git
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before 91f89c1d83e80417629791fcef6af8140d7d01c8affected · git
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before 0aece6685fc80a8de492688ca2315fb86ec379c7affected · git
- f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and later · before 3da1fdf4efbc490041eb4f836bf596201203f8f2affected · git
- before 2.6.24not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | kernel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel-matched | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-extra | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel-matched | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-extra | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-abi-stablelists | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-cross-headers | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel-matched | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-modules | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-modules-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
Published before and after this one in the same product
- ← EarlierCVE-2026-46241May 28, 2026 · spi: mpc52xx: fix use-after-free on registration failure31Monitor
- ← EarlierCVE-2026-46242May 30, 2026 · eventpoll: fix ep_remove struct eventpoll / struct file UAF32Monitor
- Later →CVE-2025-71314Jun 3, 2026 · drm/panthor: Recover from panthor_gpu_flush_caches() failures22Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 0aece6685fc80a8de492688ca2315fb86ec379c7 | Vendor (CNA) |
| Linux Linux | 2035acfb17221729b1b8ac335e941868a04ca079 | Vendor (CNA) |
| Linux Linux | 3da1fdf4efbc490041eb4f836bf596201203f8f2 | Vendor (CNA) |
| Linux Linux | 7713bd320ed4fc3d08a227cd8e41242219a16981 | Vendor (CNA) |
| Linux Linux | 91f89c1d83e80417629791fcef6af8140d7d01c8 | Vendor (CNA) |
| Linux Linux | 9544559e59438a4b609b2fdfa0763d8360572824 | Vendor (CNA) |
| Linux Linux | a3bbda6502a9398b816fa2e71c9a3f955f58013d | Vendor (CNA) |
| Linux Linux | cf20038657d6d4974349556a34e08fe0490bebbc | Vendor (CNA) |
| azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 | 6.6.143.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:bpftool | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-abi-stablelists | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-core | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-cross-headers | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-core | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-devel | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules-extra | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-devel | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-doc | 4.18.0-553.129.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| debian:linux | 6.1.174-1 · Debian:12 | Package registry (OSV) |
| red hat:bpftool | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-abi-stablelists | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-core | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-core | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:4.18.0-553.129.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
+18
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×5
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:0 | 2026-05-30 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-06-01 |
| Proof-of-concept repository on GitHub | stars:2 | 2026-06-02 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-06-03 |
| Proof-of-concept repository on GitHub | stars:0 | 2026-08-03 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-3 d
- Published
- TodayOct 25, 2026+146 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-461154 days apartblock: add pgmap check to biovec_phys_mergeable39Monitor
- CVE-2026-5322124 days apartip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()39Monitor
- CVE-2026-6403748 days apartwifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled39Monitor
- CVE-2026-6404648 days apartnet: tls: prevent chain-after-chain in plain text SG39Monitor
- CVE-2026-4311426 days apartnetfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry37Monitor
- CVE-2026-462662 days apartinet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP36Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0290 · Jun 2, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079
- git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2
- git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
- git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8
- git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824
- git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d
- git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc
- www.openwall.com/lists/oss-security/2026/06/01/6
- access.redhat.com/errata/RHSA-2026:23258
- access.redhat.com/errata/RHSA-2026:23259
- access.redhat.com/errata/RHSA-2026:23329
- access.redhat.com/errata/RHSA-2026:23395
- access.redhat.com/errata/RHSA-2026:24381
- access.redhat.com/errata/RHSA-2026:25908
- access.redhat.com/errata/RHSA-2026:26462
- access.redhat.com/errata/RHSA-2026:26515
- access.redhat.com/errata/RHSA-2026:26535
- access.redhat.com/errata/RHSA-2026:26563
- access.redhat.com/errata/RHSA-2026:26570
Vendor advisories and official records. Exploit/PoC links are deliberately left out.