firmware_loader: Block path traversal

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Summary

CVECVE-2024-47742
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 13:15:04 UTC
Updated2026-05-12 19:07:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: firmware_loader: Block path traversal Most firmware names are hardcoded strings, or are constructed from fairly constrained format strings where the dynamic parts are just some hex numbers or such. However, there are a couple codepaths in the kernel where firmware file names contain string components that are passed through from a device or semi-privileged userspace; the ones I could find (not counting interfaces that require root privileges) are: - lpfc_sli4_request_firmware_update() seems to construct the firmware filename from "ModelName", a string that was previously parsed out of some descriptor ("Vital Product Data") in lpfc_fill_vpd() - nfp_net_fw_find() seems to construct a firmware filename from a model name coming from nfp_hwinfo_lookup(pf->hwinfo, "nffw.partno"), which I think parses some descriptor that was read from the device. (But this case likely isn't exploitable because the format string looks like "netronome/nic_%s", and there shouldn't be any *folders* starting with "netronome/nic_". The previous case was different because there, the "%s" is *at the start* of the format string.) - module_flash_fw_schedule() is reachable from the ETHTOOL_MSG_MODULE_FW_FLASH_ACT netlink command, which is marked as GENL_UNS_ADMIN_PERM (meaning CAP_NET_ADMIN inside a user namespace is enough to pass the privilege check), and takes a userspace-provided firmware name. (But I think to reach this case, you need to have CAP_NET_ADMIN over a network namespace that a special kind of ethernet device is mapped into, so I think this is not a viable attack path in practice.) Fix it by rejecting any firmware names containing ".." path components. For what it's worth, I went looking and haven't found any USB device drivers that use the firmware loader dangerously.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-22

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 11.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e d1768e5535d3ded59f888637016e6f821f4e069f git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e 9b1ca33ebd05b3acef5b976c04e5e791af93ce1b git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e c30558e6c5c9ad6c86459d9acce1520ceeab9ea6 git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e a77fc4acfd49fc6076e565445b2bc5fdc3244da4 git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e 3d2411f4edcb649eaf232160db459bb4770b5251 git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e 7420c1bf7fc784e587b87329cc6dfa3dca537aa4 git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e 28f1cd94d3f1092728fb775a0fe26c5f1ac2ebeb git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e 6c4e13fdfcab34811c3143a0a03c05fec4e870ec git Not specified
CNA Linux Linux affected abb139e75c2cdbb955e840d6331cb5863e409d0e f0e5311aa8022107d63c54e2f03684ec097d1394 git Not specified
CNA Linux Linux affected 3.7 Not specified
CNA Linux Linux unaffected 3.7 semver Not specified
CNA Linux Linux unaffected 4.19.323 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.285 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.227 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.168 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.113 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.54 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.13 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11.2 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6c4e13fdfcab34811c3143a0a03c05fec4e870ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c30558e6c5c9ad6c86459d9acce1520ceeab9ea6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7420c1bf7fc784e587b87329cc6dfa3dca537aa4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/3d2411f4edcb649eaf232160db459bb4770b5251 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d1768e5535d3ded59f888637016e6f821f4e069f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a77fc4acfd49fc6076e565445b2bc5fdc3244da4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f0e5311aa8022107d63c54e2f03684ec097d1394 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9b1ca33ebd05b3acef5b976c04e5e791af93ce1b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/28f1cd94d3f1092728fb775a0fe26c5f1ac2ebeb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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