wifi: brcmfmac: make release_scratchbuffers idempotent
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: make release_scratchbuffers idempotent brcmf_pcie_release_scratchbuffers() frees the shared.scratch and shared.ringupd DMA buffers with dma_free_coherent() but does not clear the pointers afterwards, unlike the sibling release_ringbuffers() which NULLs commonrings/flowrings/idxbuf on release. Both the bus_reset .reset callback (brcmf_pcie_reset) and brcmf_pcie_remove() call release_scratchbuffers. When reset teardown has run before removal, remove's own teardown would call dma_free_coherent() a second time on the already-freed DMA allocation. NULL the pointers after free, matching release_ringbuffers(), so a later release observes that the allocation has already been released. This patch makes repeated sequential release safe; the reset-work lifetime is handled separately by the following patch. This issue was found by an in-house static analysis tool.
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 help- Published
- Aug 10, 2026
- Updated
- Aug 19, 2026
- EPSS
- 0.4% · 33th percentile
- CWE
- —
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Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 8.8
- 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.
Affected systems
—
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
- 5.2affected
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before 81c58a206d1deee01f4c29236d4154c0872f2a38affected · git
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before 382ee00b2d1e31869ae576a60d3fbe7a2153512faffected · git
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before 739b686aecdb14a6065300ea53401f043e51fd22affected · git
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before b7d1d8cb1bdca56aecebacd2896615da0acc126aaffected · git
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before 5a045c2f0fbf029873d2295178fa0785ade35af0affected · git
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before 044fca8f45ba9ab6ca526163155234cf88287ff5affected · git
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before 0ca80328df23f851c86866720d4977783c919ee6affected · git
- 4684997d9eea29380000e062755aa6d368d789a3 and later · before 538c51e9d124cf656f2dd0c0394a8545efc7102daffected · git
- before 5.2not 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 6.1.187-1 | 6.1.187-1 |
| Debian:12 | linux-6.12 | before 6.12.101-1~deb12u1 | 6.12.101-1~deb12u1 |
| Debian:13 | linux | before 6.12.101-1 | 6.12.101-1 |
| Debian:14 | linux | before 7.1.6-1 | 7.1.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
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 | 044fca8f45ba9ab6ca526163155234cf88287ff5 | Vendor (CNA) |
| Linux Linux | 0ca80328df23f851c86866720d4977783c919ee6 | Vendor (CNA) |
| Linux Linux | 382ee00b2d1e31869ae576a60d3fbe7a2153512f | Vendor (CNA) |
| Linux Linux | 538c51e9d124cf656f2dd0c0394a8545efc7102d | Vendor (CNA) |
| Linux Linux | 5a045c2f0fbf029873d2295178fa0785ade35af0 | Vendor (CNA) |
| Linux Linux | 739b686aecdb14a6065300ea53401f043e51fd22 | Vendor (CNA) |
| Linux Linux | 81c58a206d1deee01f4c29236d4154c0872f2a38 | Vendor (CNA) |
| Linux Linux | b7d1d8cb1bdca56aecebacd2896615da0acc126a | Vendor (CNA) |
| azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 | 6.6.150.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.101-1~deb12u1 · Debian:12 | 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
- 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
- high · data or configuration can be modified
- 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
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:A/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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5
- git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6
- git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f
- git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d
- git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0
- git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22
- git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38
- git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a
Vendor advisories and official records. Exploit/PoC links are deliberately left out.