{"id":"CVE-2026-99188","state":"PUBLISHED","title":"net: stmmac: dwmac1000: clear the RGMII status interrupt","description":"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 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.","publishedAt":"2026-10-28T10:35:45.591Z","updatedAt":"2026-10-28T10:35:45.591Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2e2c878a314175a4c3b76ee3be455f543438f472","status":"affected","lessThan":"affc6d572935282ef9ab1e0b790cbc31e5ad8bca","versionType":"git"},{"version":"2e2c878a314175a4c3b76ee3be455f543438f472","status":"affected","lessThan":"aa07285705f8d5bac464eb1c5b7412f8e88b91e1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c"]}],"references":["https://git.kernel.org/stable/c/affc6d572935282ef9ab1e0b790cbc31e5ad8bca","https://git.kernel.org/stable/c/aa07285705f8d5bac464eb1c5b7412f8e88b91e1"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99188.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99188","state":"PUBLISHED","datePublished":"2026-10-28T10:35:45.591Z","dateUpdated":"2026-10-28T10:35:45.591Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.400Z"},"containers":{"cna":{"title":"net: stmmac: dwmac1000: clear the RGMII status interrupt","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2e2c878a314175a4c3b76ee3be455f543438f472","status":"affected","lessThan":"affc6d572935282ef9ab1e0b790cbc31e5ad8bca","versionType":"git"},{"version":"2e2c878a314175a4c3b76ee3be455f543438f472","status":"affected","lessThan":"aa07285705f8d5bac464eb1c5b7412f8e88b91e1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/affc6d572935282ef9ab1e0b790cbc31e5ad8bca"},{"url":"https://git.kernel.org/stable/c/aa07285705f8d5bac464eb1c5b7412f8e88b91e1"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-28T10:35:45.591Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}