smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path smb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL and the default QUERY_INFO path. The QUERY_INFO branch clamps qi.input_buffer_length to the server-reported OutputBufferLength and then copies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but it never verifies that the flexible-array payload actually fits within rsp_iov[1].iov_len. A malicious server can return OutputBufferLength larger than the actual QUERY_INFO response, causing copy_to_user() to walk past the response buffer and expose adjacent kernel heap to userspace. Guard the QUERY_INFO copy with a bounds check on the actual Buffer payload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length) rather than an open-coded addition so the guard cannot overflow on 32-bit builds.
- Published
- May 1, 2026
- Updated
- Aug 5, 2026
- EPSS
- 0.6% · 45th percentile
- CWE
- CWE-125
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 8.1
- 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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| 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 kernel5.1 and later · before 6.6.136
- linux linux kernel6.7 and later · before 6.12.84
- linux linux kernel6.13 and later · before 6.18.25
- linux linux kernel6.19 and later · before 7.0.2
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
- 5.1affected
- f5778c398713692a16150ae96e5c8270bab8399f and later · before e66bdc0704977ecee667a81d38255b579c2353d0affected · git
- f5778c398713692a16150ae96e5c8270bab8399f and later · before 9e203dbb5402897c43130fb171a2617008a91f45affected · git
- f5778c398713692a16150ae96e5c8270bab8399f and later · before 1dd757379997b71a328a4b591ffaf481acd0ead1affected · git
- f5778c398713692a16150ae96e5c8270bab8399f and later · before a34d456934fe42e4da5d2cc07787bf418bee99c6affected · git
- f5778c398713692a16150ae96e5c8270bab8399f and later · before ac2f14e4705d020f04e806efa0d49ab8dc2b145faffected · git
- f5778c398713692a16150ae96e5c8270bab8399f and later · before 078fae8f50adebb903ccf2252b44391324571e78affected · git
- f5778c398713692a16150ae96e5c8270bab8399f and later · before 85fd46ee26a11841c670449508025965f61ce131affected · git
- f5778c398713692a16150ae96e5c8270bab8399f and later · before a58c5af19ff0d6f44f6e9fe31e33a2c92223f77eaffected · git
- before 5.1not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.176-1 | 6.1.176-1 |
| Debian:13 | linux | before 6.12.85-1 | 6.12.85-1 |
| Debian:14 | linux | before 7.0.3-1 | 7.0.3-1 |
| openSUSE:Tumbleweed | kernel-source | before 7.0.7-1.1 | 7.0.7-1.1 |
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
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 078fae8f50adebb903ccf2252b44391324571e78 | Vendor (CNA) |
| Linux Linux | 1dd757379997b71a328a4b591ffaf481acd0ead1 | Vendor (CNA) |
| Linux Linux | 85fd46ee26a11841c670449508025965f61ce131 | Vendor (CNA) |
| Linux Linux | 9e203dbb5402897c43130fb171a2617008a91f45 | Vendor (CNA) |
| Linux Linux | a34d456934fe42e4da5d2cc07787bf418bee99c6 | Vendor (CNA) |
| Linux Linux | a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e | Vendor (CNA) |
| Linux Linux | ac2f14e4705d020f04e806efa0d49ab8dc2b145f | Vendor (CNA) |
| Linux Linux | e66bdc0704977ecee667a81d38255b579c2353d0 | Vendor (CNA) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| opensuse:kernel-source | 7.0.7-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
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.
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.
No nightly-computed relations.
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).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/078fae8f50adebb903ccf2252b44391324571e78
- git.kernel.org/stable/c/1dd757379997b71a328a4b591ffaf481acd0ead1
- git.kernel.org/stable/c/85fd46ee26a11841c670449508025965f61ce131
- git.kernel.org/stable/c/9e203dbb5402897c43130fb171a2617008a91f45
- git.kernel.org/stable/c/a34d456934fe42e4da5d2cc07787bf418bee99c6
- git.kernel.org/stable/c/a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e
- git.kernel.org/stable/c/ac2f14e4705d020f04e806efa0d49ab8dc2b145f
- git.kernel.org/stable/c/e66bdc0704977ecee667a81d38255b579c2353d0
Vendor advisories and official records. Exploit/PoC links are deliberately left out.