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CVE-2026-68192

wifi: brcmfmac: make release_scratchbuffers idempotent

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in 81c58a206d1deee01f4c29236d4154c0872f2a38; From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in 382ee00b2d1e31869ae576a60d3fbe7a2153512f; From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in 739b686aecdb14a6065300ea53401f043e51fd22; From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in b7d1d8cb1bdca56aecebacd2896615da0acc126a; From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in 5a045c2f0fbf029873d2295178fa0785ade35af0; From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in 044fca8f45ba9ab6ca526163155234cf88287ff5; From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in 0ca80328df23f851c86866720d4977783c919ee6; From 4684997d9eea29380000e062755aa6d368d789a3 · fixed in 538c51e9d124cf656f2dd0c0394a8545efc7102d

  • Linux Linux

    5.2

  • KernelLinux

    From 5.2.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8

git.kernel.org