CVE-2026-31464: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
Noroxi assessment
Priority: Monitor (action score 32/100)
- 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: 0.27% (FIRST EPSS).
- Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89, 4ed727e35b0ab17d3eeeb1e8023768396e2be161, 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f.
Low priority for now. Upgrade to Linux Linux 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89, 4ed727e35b0ab17d3eeeb1e8023768396e2be161, 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f 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: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory. Fix by clamping num_written to max_targets before storing it.
- Published
- Apr 22, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.2% · 20th percentile
- CWE
- CWE-125
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 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
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.
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.
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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 kernel2.6.27 and later · before 5.10.253
- linux linux kernel5.11 and later · before 5.15.203
- linux linux kernel5.16 and later · before 6.1.168
- linux linux kernel6.2 and later · before 6.6.131
- linux linux kernel6.7 and later · before 6.12.80
- linux linux kernel6.13 and later · before 6.18.21
- linux linux kernel6.19 and later · before 6.19.11
- linux linux kernel7.0
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
- 2.6.27affected
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before d842348f8a00d5b1d7358f207eb34ffcf5b16df3affected · git
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before a007246cb6c9ebdc93dafbf63cc2d43d98f402ccaffected · git
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89affected · git
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before 4ed727e35b0ab17d3eeeb1e8023768396e2be161affected · git
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before d1466bf991b2343cf2ba8336e440c8faf3cbb780affected · git
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before 786f10b1966e485046839f992e89f2c18cbd1983affected · git
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before bae4df0a643fa7f84663473aa3082a9c2ed139dbaffected · git
- 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 and later · before 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362faffected · git
- before 2.6.27not 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 6.1.170-1 | 6.1.170-1 |
| Debian:13 | linux | before 6.12.85-1 | 6.12.85-1 |
| Debian:14 | linux | before 6.19.11-1 | 6.19.11-1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kernel-default | before 4.12.14-122.317.1 | 4.12.14-122.317.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_84 | before 1-8.7.1 | 1-8.7.1 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_16 | before 1-150700.15.3.2 | 1-150700.15.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_16 | before 1-150700.1.5.2 | 1-150700.1.5.2 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-64kb | before 6.4.0-150700.53.60.1 | 6.4.0-150700.53.60.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-default | before 6.4.0-150700.53.60.1 | 6.4.0-150700.53.60.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-default-base | before 6.4.0-150700.53.60.1.150700.17.35.4 | 6.4.0-150700.53.60.1.150700.17.35.4 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-source | before 6.4.0-150700.53.60.1 | 6.4.0-150700.53.60.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-zfcpdump | before 6.4.0-150700.53.60.1 | 6.4.0-150700.53.60.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP7 | kernel-docs | before 6.4.0-150700.53.60.1 | 6.4.0-150700.53.60.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP7 | kernel-obs-build | before 6.4.0-150700.53.60.2 | 6.4.0-150700.53.60.2 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP7 | kernel-syms | before 6.4.0-150700.53.60.1 | 6.4.0-150700.53.60.1 |
| SUSE:Linux Enterprise Module for Public Cloud 15 SP7 | kernel-azure | before 6.4.0-150700.53.60.1 | 6.4.0-150700.53.60.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-source | before 4.12.14-122.317.1 | 4.12.14-122.317.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-syms | before 4.12.14-122.317.1 | 4.12.14-122.317.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-azure | before 6.12.0-160000.34.1 | 6.12.0-160000.34.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-docs | before 6.12.0-160000.34.1 | 6.12.0-160000.34.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-kvmsmall | before 6.12.0-160000.34.1 | 6.12.0-160000.34.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-obs-qa | before 6.12.0-160000.34.1 | 6.12.0-160000.34.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-zfcpdump | before 6.12.0-160000.34.1 | 6.12.0-160000.34.1 |
| SUSE:Linux Micro 6.0 | kernel-default | before 6.4.0-47.1 | 6.4.0-47.1 |
+15
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-2026-31454Apr 22, 2026 · xfs: save ailp before dropping the AIL lock in push callbacks31Monitor
- ← EarlierCVE-2026-31462Apr 22, 2026 · drm/amdgpu: prevent immediate PASID reuse case22Monitor
- Later →CVE-2026-31466Apr 22, 2026 · mm/huge_memory: fix folio isn't locked in softleaf_to_folio()18Monitor
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 | 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 | Vendor (CNA) |
| Linux Linux | 4ed727e35b0ab17d3eeeb1e8023768396e2be161 | Vendor (CNA) |
| Linux Linux | 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f | Vendor (CNA) |
| Linux Linux | 786f10b1966e485046839f992e89f2c18cbd1983 | Vendor (CNA) |
| Linux Linux | a007246cb6c9ebdc93dafbf63cc2d43d98f402cc | Vendor (CNA) |
| Linux Linux | bae4df0a643fa7f84663473aa3082a9c2ed139db | Vendor (CNA) |
| Linux Linux | d1466bf991b2343cf2ba8336e440c8faf3cbb780 | Vendor (CNA) |
| Linux Linux | d842348f8a00d5b1d7358f207eb34ffcf5b16df3 | Vendor (CNA) |
| debian:linux | 6.1.170-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-azure | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-default | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-default-base | 6.12.0-160000.34.1.160000.2.15 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-docs | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-kvmsmall | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-obs-build | 6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-obs-qa | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-rt | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-source | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-syms | 6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | 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.
No history yet (it accumulates with the daily EPSS job).
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
- Someone on the same network segment 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
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Adjacent
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- 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:A/AC:L/PR:N/UI:N/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
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161
- git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f
- git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983
- git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc
- git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db
- git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780
- git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3
Vendor advisories and official records. Exploit/PoC links are deliberately left out.