CVE-2026-46195: smb: client: validate dacloffset before building DACL pointers
Noroxi assessment
Priority: Monitor (action score 39/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.67% (FIRST EPSS); higher than 52.6% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: Linux Linux 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7, 5de2665e913a10ad70aaeecf736b97276e83d995, 8bd07e417b6bda67e317920584e48cb6ee442a8a; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7, 5de2665e913a10ad70aaeecf736b97276e83d995, 8bd07e417b6bda67e317920584e48cb6ee442a8a; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: validate dacloffset before building DACL pointers parse_sec_desc(), build_sec_desc(), and the chown path in id_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd before proving a DACL header fits inside the returned security descriptor. On 32-bit builds a malicious server can return dacloffset near U32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip past the later pointer-based bounds checks. build_sec_desc() and id_mode_to_cifs_acl() can then dereference DACL fields from the wrapped pointer in the chmod/chown rewrite paths. Validate dacloffset numerically before building any DACL pointer and reuse the same helper at the three DACL entry points.
- Published
- May 28, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.6% · 52th percentile
- CWE
- CWE-476
Report tools
Action score
39
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.8
- 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
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi 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 |
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
- 5.12affected
- bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 and later · before 5de2665e913a10ad70aaeecf736b97276e83d995affected · git
- bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 and later · before f9dc3be8f403c1216df73e57221f44b045e7ee0baffected · git
- bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 and later · before ba7f71b6161c0943dafc367565e5843d16b7d505affected · git
- bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 and later · before 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7affected · git
- bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 and later · before c688f3ed73d31943334ad2139cb02ec49664322aaffected · git
- bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 and later · before 8bd07e417b6bda67e317920584e48cb6ee442a8aaffected · git
- bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 and later · before f98b48151cc502ada59d9778f0112d21f2586ca3affected · git
- before 5.12not affected · semver
- 5.15.210 and later · up to and including 5.15.*not affected · semver
Affected versions · NVD (5)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.12 and later · before 6.6.140
- linux linux kernel6.7 and later · before 6.12.88
- linux linux kernel6.13 and later · before 6.18.30
- linux linux kernel6.19 and later · before 7.0.7
- linux linux kernel7.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.126.1.el8_10 | 4.18.0-553.126.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
| AlmaLinux:8 | kernel-rt-modules | before 4.18.0-553.126.1.rt7.467.el8_10 | 4.18.0-553.126.1.rt7.467.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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
Published before and after this one in the same product
- ← EarlierCVE-2026-46191May 28, 2026 · fbcon: Avoid OOB font access if console rotation fails28Monitor
- ← EarlierCVE-2026-46193May 28, 2026 · xfrm: ah: account for ESN high bits in async callbacks22Monitor
- Later →CVE-2026-46196May 28, 2026 · tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()22Monitor
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 | 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7 | Vendor (CNA) |
| Linux Linux | 5de2665e913a10ad70aaeecf736b97276e83d995 | Vendor (CNA) |
| Linux Linux | 8bd07e417b6bda67e317920584e48cb6ee442a8a | Vendor (CNA) |
| Linux Linux | ba7f71b6161c0943dafc367565e5843d16b7d505 | Vendor (CNA) |
| Linux Linux | c688f3ed73d31943334ad2139cb02ec49664322a | Vendor (CNA) |
| Linux Linux | f98b48151cc502ada59d9778f0112d21f2586ca3 | Vendor (CNA) |
| Linux Linux | f9dc3be8f403c1216df73e57221f44b045e7ee0b | Vendor (CNA) |
| azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 | 6.6.141.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:kernel | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.12.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel-matched | 0:5.14.0-687.12.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
+7
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
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)
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- 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
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (2)
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (13 more)Show less
- git.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995
- git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a
- git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505
- git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a
- git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3
- git.kernel.org/stable/c/f9dc3be8f403c1216df73e57221f44b045e7ee0b
- access.redhat.com/errata/RHSA-2026:21556
- access.redhat.com/errata/RHSA-2026:21706
- access.redhat.com/errata/RHSA-2026:21745
- access.redhat.com/security/cve/CVE-2026-46195
- bugzilla.redhat.com/show_bug.cgi?id=2482606
- cert-portal.siemens.com/productcert/html/ssa-784472.html
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46195.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.