{"id":"CVE-2024-47742","summary":"firmware_loader: Block path traversal","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: Block path traversal\n\nMost firmware names are hardcoded strings, or are constructed from fairly\nconstrained format strings where the dynamic parts are just some hex\nnumbers or such.\n\nHowever, there are a couple codepaths in the kernel where firmware file\nnames contain string components that are passed through from a device or\nsemi-privileged userspace; the ones I could find (not counting interfaces\nthat require root privileges) are:\n\n - lpfc_sli4_request_firmware_update() seems to construct the firmware\n   filename from \"ModelName\", a string that was previously parsed out of\n   some descriptor (\"Vital Product Data\") in lpfc_fill_vpd()\n - nfp_net_fw_find() seems to construct a firmware filename from a model\n   name coming from nfp_hwinfo_lookup(pf-\u003ehwinfo, \"nffw.partno\"), which I\n   think parses some descriptor that was read from the device.\n   (But this case likely isn't exploitable because the format string looks\n   like \"netronome/nic_%s\", and there shouldn't be any *folders* starting\n   with \"netronome/nic_\". The previous case was different because there,\n   the \"%s\" is *at the start* of the format string.)\n - module_flash_fw_schedule() is reachable from the\n   ETHTOOL_MSG_MODULE_FW_FLASH_ACT netlink command, which is marked as\n   GENL_UNS_ADMIN_PERM (meaning CAP_NET_ADMIN inside a user namespace is\n   enough to pass the privilege check), and takes a userspace-provided\n   firmware name.\n   (But I think to reach this case, you need to have CAP_NET_ADMIN over a\n   network namespace that a special kind of ethernet device is mapped into,\n   so I think this is not a viable attack path in practice.)\n\nFix it by rejecting any firmware names containing \"..\" path components.\n\nFor what it's worth, I went looking and haven't found any USB device\ndrivers that use the firmware loader dangerously.","modified":"2026-04-02T12:20:26.224895Z","published":"2024-10-21T12:14:10.499Z","related":["MGASA-2024-0344","MGASA-2024-0345","SUSE-SU-2024:3984-1","SUSE-SU-2024:3986-1","SUSE-SU-2024:4100-1","SUSE-SU-2024:4315-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4364-1","SUSE-SU-2024:4376-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:0034-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47742.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/28f1cd94d3f1092728fb775a0fe26c5f1ac2ebeb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d2411f4edcb649eaf232160db459bb4770b5251"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c4e13fdfcab34811c3143a0a03c05fec4e870ec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7420c1bf7fc784e587b87329cc6dfa3dca537aa4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b1ca33ebd05b3acef5b976c04e5e791af93ce1b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a77fc4acfd49fc6076e565445b2bc5fdc3244da4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c30558e6c5c9ad6c86459d9acce1520ceeab9ea6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d1768e5535d3ded59f888637016e6f821f4e069f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f0e5311aa8022107d63c54e2f03684ec097d1394"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47742.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-47742"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"abb139e75c2cdbb955e840d6331cb5863e409d0e"},{"fixed":"d1768e5535d3ded59f888637016e6f821f4e069f"},{"fixed":"9b1ca33ebd05b3acef5b976c04e5e791af93ce1b"},{"fixed":"c30558e6c5c9ad6c86459d9acce1520ceeab9ea6"},{"fixed":"a77fc4acfd49fc6076e565445b2bc5fdc3244da4"},{"fixed":"3d2411f4edcb649eaf232160db459bb4770b5251"},{"fixed":"7420c1bf7fc784e587b87329cc6dfa3dca537aa4"},{"fixed":"28f1cd94d3f1092728fb775a0fe26c5f1ac2ebeb"},{"fixed":"6c4e13fdfcab34811c3143a0a03c05fec4e870ec"},{"fixed":"f0e5311aa8022107d63c54e2f03684ec097d1394"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47742.json"}}],"schema_version":"1.7.5"}