{"id":"CVE-2025-38126","title":"net: stmmac: make sure that ptp_rate is not 0 before configuring timestamping","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: make sure that ptp_rate is not 0 before configuring timestamping\n\nThe stmmac platform drivers that do not open-code the clk_ptp_rate value\nafter having ret…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < 32af9c289234990752281c805500dfe03c5b2b8f","Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < b263088ee8ab14563817a8be3519af8e25225793","Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < bb033c6781ce1b0264c3993b767b4aa9021959c2","Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < 379cd990dfe752b38fcf46034698a9a150626c7a","Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < 030ce919e114a111e83b7976ecb3597cefd33f26","Linux 4.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:50:06.510216Z"},"published":"2025-07-03","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:52:16.778Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38126","references":[{"url":"https://git.kernel.org/stable/c/32af9c289234990752281c805500dfe03c5b2b8f"},{"url":"https://git.kernel.org/stable/c/b263088ee8ab14563817a8be3519af8e25225793"},{"url":"https://git.kernel.org/stable/c/bb033c6781ce1b0264c3993b767b4aa9021959c2"},{"url":"https://git.kernel.org/stable/c/379cd990dfe752b38fcf46034698a9a150626c7a"},{"url":"https://git.kernel.org/stable/c/030ce919e114a111e83b7976ecb3597cefd33f26"}],"tags":["cve.org"],"epss":0.00199,"epssPercentile":0.09821,"ingestedAt":"2026-11-05T22:38:31.922Z","slug":"CVE-2025-38126","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: make sure that ptp_rate is not 0 before configuring timestamping\n\nThe stmmac platform drivers that do not open-code the clk_ptp_rate value\nafter having retrieved the default one from the device-tree can end up\nwith 0 in clk_ptp_rate (as clk_get_rate can return 0). It will\neventually propagate up to PTP initialization when bringing up the\ninterface, leading to a divide by 0:\n\n Division by zero in kernel.\n CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.30-00001-g48313bd5768a #22\n Hardware name: STM32 (Device Tree Support)\n Call trace:\n  unwind_backtrace from show_stack+0x18/0x1c\n  show_stack from dump_stack_lvl+0x6c/0x8c\n  dump_stack_lvl from Ldiv0_64+0x8/0x18\n  Ldiv0_64 from stmmac_init_tstamp_counter+0x190/0x1a4\n  stmmac_init_tstamp_counter from stmmac_hw_setup+0xc1c/0x111c\n  stmmac_hw_setup from __stmmac_open+0x18c/0x434\n  __stmmac_open from stmmac_open+0x3c/0xbc\n  stmmac_open from __dev_open+0xf4/0x1ac\n  __dev_open from __dev_change_flags+0x1cc/0x224\n  __dev_change_flags from dev_change_flags+0x24/0x60\n  dev_change_flags from ip_auto_config+0x2e8/0x11a0\n  ip_auto_config from do_one_initcall+0x84/0x33c\n  do_one_initcall from kernel_init_freeable+0x1b8/0x214\n  kernel_init_freeable from kernel_init+0x24/0x140\n  kernel_init from ret_from_fork+0x14/0x28\n Exception stack(0xe0815fb0 to 0xe0815ff8)\n\nPrevent this division by 0 by adding an explicit check and error log\nabout the actual issue. While at it, remove the same check from\nstmmac_ptp_register, which then becomes duplicate\n\n## Affected\n\n- `Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < 32af9c289234990752281c805500dfe03c5b2b8f`\n- `Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < b263088ee8ab14563817a8be3519af8e25225793`\n- `Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < bb033c6781ce1b0264c3993b767b4aa9021959c2`\n- `Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < 379cd990dfe752b38fcf46034698a9a150626c7a`\n- `Linux >= 19d857c9038e5c07db8f8cc02b5ad0cd0098714f < 030ce919e114a111e83b7976ecb3597cefd33f26`\n- `Linux 4.5`\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":[]}