{"id":"CVE-2026-98008","state":"PUBLISHED","title":"net: macb: fix NULL pointer dereference on unbind with fixed-link","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: fix NULL pointer dereference on unbind with fixed-link\n\nWhen the device tree describes a fixed-link and has no \"mdio\" child\nnode, macb_mii_init() returns early without allocating the MDIO bus,\nleaving bp->mii_bus as NULL.\n\nTwo cleanup paths then dereference this NULL bus:\n\n1. On driver unbind, macb_remove() unconditionally calls\n   mdiobus_unregister(bp->mii_bus), which oopses:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 00000000000004a8\n  pc : mdiobus_unregister+0x14/0xa4\n  lr : macb_remove+0x38/0xa4\n  Call trace:\n   mdiobus_unregister+0x14/0xa4 (P)\n   macb_remove+0x38/0xa4\n   platform_remove+0x20/0x30\n   device_release_driver_internal+0x1c8/0x224\n   unbind_store+0xb4/0xbc\n\n2. On the probe error path in macb_probe(), reached when\n   macb_mii_init() has succeeded but a subsequent step fails, the\n   err_out_unregister_mdio label runs the same unconditional cleanup.\n\nmdiobus_unregister() and mdiobus_free() do not guard against a NULL\nbus, so guard the calls in both macb_remove() and the probe error\npath.","publishedAt":"2026-09-25T10:23:33.532Z","updatedAt":"2026-10-19T09:12:13.751Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"831e19e565b5210930fa183730071f8290c61263","status":"affected","lessThan":"afa224cabc0132ca414b9141b1a919ca2d318cd0","versionType":"git"},{"version":"81db1e52848694761a1aa162ce76198af9964ed8","status":"affected","lessThan":"054ad8e66025eb4778d840bef80c270646cebcd2","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"f737d999fcb8f276d77b01ea4c2016ee01dad19b","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"5710f6a74f63cbba0e15cd75917234916181c9d4","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"edb39c7666bb3924da761dfb417db85c1e5d8ad3","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"38b6be101006d3e7af972999f45d4f1e8250587a","versionType":"git"},{"version":"cafa5942bd2df3d80e3eeb2deb4bc050f7761f3d","status":"affected","versionType":"git"},{"version":"c81dcaa9cd0b66816c2ecb6c5df0b6afde9c7da5","status":"affected","versionType":"git"},{"version":"19088c5378c9fea54e552d8bc7418a3aa1e06990","status":"affected","versionType":"git"},{"version":"6.1.114","status":"affected","lessThan":"6.1.189","versionType":"semver"},{"version":"6.6.58","status":"affected","lessThan":"6.6.158","versionType":"semver"},{"version":"5.10.228","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.169","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.11.5","status":"affected","lessThan":"6.12","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/cadence/macb_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","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/cadence/macb_main.c"]}],"references":["https://git.kernel.org/stable/c/afa224cabc0132ca414b9141b1a919ca2d318cd0","https://git.kernel.org/stable/c/054ad8e66025eb4778d840bef80c270646cebcd2","https://git.kernel.org/stable/c/f737d999fcb8f276d77b01ea4c2016ee01dad19b","https://git.kernel.org/stable/c/5710f6a74f63cbba0e15cd75917234916181c9d4","https://git.kernel.org/stable/c/edb39c7666bb3924da761dfb417db85c1e5d8ad3","https://git.kernel.org/stable/c/38b6be101006d3e7af972999f45d4f1e8250587a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98008.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98008","state":"PUBLISHED","datePublished":"2026-09-25T10:23:33.532Z","dateUpdated":"2026-10-19T09:12:13.751Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:19:56.068Z"},"containers":{"cna":{"title":"net: macb: fix NULL pointer dereference on unbind with fixed-link","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: fix NULL pointer dereference on unbind with fixed-link\n\nWhen the device tree describes a fixed-link and has no \"mdio\" child\nnode, macb_mii_init() returns early without allocating the MDIO bus,\nleaving bp->mii_bus as NULL.\n\nTwo cleanup paths then dereference this NULL bus:\n\n1. On driver unbind, macb_remove() unconditionally calls\n   mdiobus_unregister(bp->mii_bus), which oopses:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 00000000000004a8\n  pc : mdiobus_unregister+0x14/0xa4\n  lr : macb_remove+0x38/0xa4\n  Call trace:\n   mdiobus_unregister+0x14/0xa4 (P)\n   macb_remove+0x38/0xa4\n   platform_remove+0x20/0x30\n   device_release_driver_internal+0x1c8/0x224\n   unbind_store+0xb4/0xbc\n\n2. On the probe error path in macb_probe(), reached when\n   macb_mii_init() has succeeded but a subsequent step fails, the\n   err_out_unregister_mdio label runs the same unconditional cleanup.\n\nmdiobus_unregister() and mdiobus_free() do not guard against a NULL\nbus, so guard the calls in both macb_remove() and the probe error\npath."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"831e19e565b5210930fa183730071f8290c61263","status":"affected","lessThan":"afa224cabc0132ca414b9141b1a919ca2d318cd0","versionType":"git"},{"version":"81db1e52848694761a1aa162ce76198af9964ed8","status":"affected","lessThan":"054ad8e66025eb4778d840bef80c270646cebcd2","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"f737d999fcb8f276d77b01ea4c2016ee01dad19b","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"5710f6a74f63cbba0e15cd75917234916181c9d4","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"edb39c7666bb3924da761dfb417db85c1e5d8ad3","versionType":"git"},{"version":"d0c3601f2c4e12e7689b0f46ebc17525250ea8c3","status":"affected","lessThan":"38b6be101006d3e7af972999f45d4f1e8250587a","versionType":"git"},{"version":"cafa5942bd2df3d80e3eeb2deb4bc050f7761f3d","status":"affected","versionType":"git"},{"version":"c81dcaa9cd0b66816c2ecb6c5df0b6afde9c7da5","status":"affected","versionType":"git"},{"version":"19088c5378c9fea54e552d8bc7418a3aa1e06990","status":"affected","versionType":"git"},{"version":"6.1.114","status":"affected","lessThan":"6.1.189","versionType":"semver"},{"version":"6.6.58","status":"affected","lessThan":"6.6.158","versionType":"semver"},{"version":"5.10.228","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.169","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.11.5","status":"affected","lessThan":"6.12","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/cadence/macb_main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","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/cadence/macb_main.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/afa224cabc0132ca414b9141b1a919ca2d318cd0"},{"url":"https://git.kernel.org/stable/c/054ad8e66025eb4778d840bef80c270646cebcd2"},{"url":"https://git.kernel.org/stable/c/f737d999fcb8f276d77b01ea4c2016ee01dad19b"},{"url":"https://git.kernel.org/stable/c/5710f6a74f63cbba0e15cd75917234916181c9d4"},{"url":"https://git.kernel.org/stable/c/edb39c7666bb3924da761dfb417db85c1e5d8ad3"},{"url":"https://git.kernel.org/stable/c/38b6be101006d3e7af972999f45d4f1e8250587a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:12:13.751Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.114","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.58","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.228"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.169"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.5"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}