{"id":"CVE-2026-99188","title":"net: stmmac: dwmac1000: clear the RGMII status interrupt","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: dwmac1000: clear the RGMII status interrupt\n\nSince commit 2e2c878a3141 (\"net: stmmac: remove SGMII/RGMII/SMII\ninterrupt handling\") nothing on the RGMII pat…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 2e2c878a314175a4c3b76ee3be455f543438f472 < affc6d572935282ef9ab1e0b790cbc31e5ad8bca","Linux >= 2e2c878a314175a4c3b76ee3be455f543438f472 < aa07285705f8d5bac464eb1c5b7412f8e88b91e1","Linux 6.19"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T10:35:45.591Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99188","references":[{"url":"https://git.kernel.org/stable/c/affc6d572935282ef9ab1e0b790cbc31e5ad8bca"},{"url":"https://git.kernel.org/stable/c/aa07285705f8d5bac464eb1c5b7412f8e88b91e1"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T11:09:40.376Z","slug":"CVE-2026-99188","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: dwmac1000: clear the RGMII status interrupt\n\nSince commit 2e2c878a3141 (\"net: stmmac: remove SGMII/RGMII/SMII\ninterrupt handling\") nothing on the RGMII path reads GMAC_RGSMIIIS, so\nRGSMIIIS stays pending behind GMAC_INT_MASK from the first link change\non. stmmac_resume() resets the MAC in stmmac_hw_setup(); the reset sets\nGMAC_INT_MASK to 0 until dwmac1000_core_init() writes the mask again,\nand the pending status storms the line:\n\n  dwmac_dma_interrupt: unexpected status 04000000\n\nA register dump at the first message on ODROID-HC4 showed it:\n\n  core int_status 00000001 int_mask 00000000 pmt 00000000 rgsmiiis 0000000d\n\nWhen the resume thread runs on the CPU that takes the MAC interrupt,\nthe storm starves it: a soft lockup, then a watchdog reset or a hang.\n\nRead GMAC_RGSMIIIS in dwmac1000_irq_status() when the status is not\nmasked, as the driver did before 2e2c878a3141; the read clears it.\n\nWake-on-LAN resume from s2idle with the resume thread and the MAC\ninterrupt on one CPU: Helios64 (dwmac-rk), 7.3-rc6, soft-locked in 3 of\n3 resumes without a fix and in 0 of 10 with this patch; it ran with an\nout-of-tree dwmac-rk change that keeps the GMAC powered across suspend.\nODROID-HC4 (dwmac-meson8b): 0 of 10 with this patch, 2 of 2 without a\nfix on a 7.3-rc5 build. irq_rgmii_n went up by one per resume.\n\n## Affected\n\n- `Linux >= 2e2c878a314175a4c3b76ee3be455f543438f472 < affc6d572935282ef9ab1e0b790cbc31e5ad8bca`\n- `Linux >= 2e2c878a314175a4c3b76ee3be455f543438f472 < aa07285705f8d5bac464eb1c5b7412f8e88b91e1`\n- `Linux 6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}