{"id":"CVE-2026-99197","kind":"vulnerability","aliases":["CVE-2026-99197"],"related":[],"title":"Linux kernel: mv643xx Ethernet driver crashes on probe with shaper enabled","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mv643xx: move setting of netops to fix crash\n\nmv643xx_eth_probe() connects the PHY before dev->netdev_ops is\nassigned. phy_attach_direct() -> phy_link_topo_add_phy() reads\ndev->netdev_ops through netdev_need_ops_lock() since the commit in\nquestion, so probing crashes with a NULL pointer dereference when\nCONFIG_NET_SHAPER is enabled.\n\nAssign netdev_ops before the PHY attach, as was done for emac in commit\n7c9f391ec89c (\"net: emac: move setting of netops to fix crash\").","summary":"The mv643xx Ethernet driver assigns its network operations table after attaching the PHY, so with CONFIG_NET_SHAPER enabled the kernel dereferences a NULL pointer during probe. The sources describe a crash (denial of service) and do not describe code execution or data exposure.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["arm","embedded","linux-kernel","marvell-mv643xx","runtime"],"not_affected_if":["config-net-shaper-disabled","no-mv643xx-hardware"],"how_to_check":"- Check whether the running kernel has `CONFIG_NET_SHAPER=y` and whether the board uses the mv643xx_eth driver (`lsmod | grep mv643xx` or `grep -i mv643xx /proc/modules`)\n- Compare the running kernel to the fixed commit: unknown","fix":"- Update the Linux kernel to a release that includes the upstream commit that moves the netdev_ops assignment before the PHY attach (commit id not given in the sources, so unknown)\n- Until patched, unknown workaround from the sources","status":"open","published_at":"2026-10-28T11:17:40+00:00","first_seen_at":"2026-10-28T11:32:37+00:00","triaged_at":"2026-10-28T11:34:06+00:00","updated_at":"2026-10-28T11:34:06+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-28T11:34:06Z","model":"claude-haiku-5-5","output":{"fix":"- Update the Linux kernel to a release that includes the upstream commit that moves the netdev_ops assignment before the PHY attach (commit id not given in the sources, so unknown)\n- Until patched, unknown workaround from the sources","reach":"local","title":"Linux kernel: mv643xx Ethernet driver crashes on probe with shaper enabled","impact":"low","summary":"The mv643xx Ethernet driver assigns its network operations table after attaching the PHY, so with CONFIG_NET_SHAPER enabled the kernel dereferences a NULL pointer during probe. The sources describe a crash (denial of service) and do not describe code execution or data exposure.","category":"runtime","nicknames":[],"who_cares":["linux-kernel","embedded","arm","marvell-mv643xx"],"confidence":0.6,"needs_auth":"no","worst_case":"Kernel crashes during network driver probe, causing denial of service at boot","analyst_note":"Confirm affected kernel version range and the fixed upstream release from the NVD entry or kernel.org stable commit 7c9f391ec89c follow-up.","how_to_check":"- Check whether the running kernel has `CONFIG_NET_SHAPER=y` and whether the board uses the mv643xx_eth driver (`lsmod | grep mv643xx` or `grep -i mv643xx /proc/modules`)\n- Compare the running kernel to the fixed commit: unknown","needs_analyst":true,"not_affected_if":["no-mv643xx-hardware","config-net-shaper-disabled"],"who_is_affected":"Systems running a Linux kernel with the mv643xx Ethernet driver (common on older Marvell ARM boards such as some NAS and embedded devices) and CONFIG_NET_SHAPER enabled. The sources do not say which kernel versions or boards are affected, and systems without this driver or without that option are not affected by this crash.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000692,"input_tokens":3440,"output_tokens":697,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-99197':14A,17A '7c9f391ec89c':152C 'add':108C 'arm':18B 'assign':31B,101C,138C 'attach':37B,103C,144C 'code':66B 'commit':121C,151C 'config':42B,133C 'connect':93C 'crash':6A,58B,89C,126C,161C 'cve':12A,15A 'data':69B 'denial':59B 'derefer':48B,131C 'describ':56B,65B 'dev':97C,111C 'direct':104C 'done':147C 'driver':5A,30B 'emac':149C,154C 'embed':19B 'enabl':11A,45B,137C 'eth':91C 'ethernet':4A,29B 'execut':67B 'exposur':70B 'fix':88C,160C 'follow':76C 'kernel':2A,22B,47B,74C 'link':106C 'linux':1A,21B,73C 'linux-kernel':20B 'lock':118C 'marvel':24B 'marvell-mv643xx':23B 'move':83C,155C 'mv643xx':3A,25B,28B,82C,90C 'need':116C 'net':43B,81C,134C,153C 'netdev':98C,112C,115C,139C 'netop':86C,158C 'network':33B 'null':50B,129C 'op':99C,113C,117C,140C 'oper':34B 'phi':39B,95C,102C,105C,109C,143C 'pointer':51B,130C 'probe':8A,53B,92C,125C 'question':123C 'read':110C 'resolv':80C 'runtim':26B 'servic':61B 'set':84C,156C 'shaper':10A,44B,135C 'sinc':119C 'sourc':55B 'tabl':35B 'topo':107C 'vulner':77C","nicknames":[],"mitigations":[],"who_affected":"Systems running a Linux kernel with the mv643xx Ethernet driver (common on older Marvell ARM boards such as some NAS and embedded devices) and CONFIG_NET_SHAPER enabled. The sources do not say which kernel versions or boards are affected, and systems without this driver or without that option are not affected by this crash.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-28T11:17:40+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-99197","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99197","severity":null,"published_at":"2026-10-28T11:17:40+00:00","modified_at":"2026-10-28T11:17:40+00:00","first_seen_at":"2026-10-28T11:32:37+00:00","fetched_at":"2026-10-28T11:32:37+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}