CVE-2026-68192wifi: brcmfmac: make release_scratchbuffers idempotent
- 8.8HighCVSS base score
- 0.41%Exploitation in 30 daysEPSS · top 64% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.41% · top 64% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < 81c58a206d1deee01f4c29236d4154c0872f2a38
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < 382ee00b2d1e31869ae576a60d3fbe7a2153512f
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < 739b686aecdb14a6065300ea53401f043e51fd22
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < b7d1d8cb1bdca56aecebacd2896615da0acc126a
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < 5a045c2f0fbf029873d2295178fa0785ade35af0
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < 044fca8f45ba9ab6ca526163155234cf88287ff5
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < 0ca80328df23f851c86866720d4977783c919ee6
- affected 4684997d9eea29380000e062755aa6d368d789a3 – < 538c51e9d124cf656f2dd0c0394a8545efc7102d
- affected 5.2
- unaffected < 5.2
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38 (opens in a new tab)
- https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f (opens in a new tab)
- https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22 (opens in a new tab)
- https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a (opens in a new tab)
- https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0 (opens in a new tab)
- https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5 (opens in a new tab)
- https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6 (opens in a new tab)
- https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-55293 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68192)Record last updated .