CVE-2025-37787 (GCVE-0-2025-37787)

Vulnerability from cvelistv5 – Published: 2025-05-01 13:07 – Updated: 2025-11-03 19:55
VLAI?
Title
net: dsa: mv88e6xxx: avoid unregistering devlink regions which were never registered
Summary
In the Linux kernel, the following vulnerability has been resolved: net: dsa: mv88e6xxx: avoid unregistering devlink regions which were never registered Russell King reports that a system with mv88e6xxx dereferences a NULL pointer when unbinding this driver: https://lore.kernel.org/netdev/Z_lRkMlTJ1KQ0kVX@shell.armlinux.org.uk/ The crash seems to be in devlink_region_destroy(), which is not NULL tolerant but is given a NULL devlink global region pointer. At least on some chips, some devlink regions are conditionally registered since the blamed commit, see mv88e6xxx_setup_devlink_regions_global(): if (cond && !cond(chip)) continue; These are MV88E6XXX_REGION_STU and MV88E6XXX_REGION_PVT. If the chip does not have an STU or PVT, it should crash like this. To fix the issue, avoid unregistering those regions which are NULL, i.e. were skipped at mv88e6xxx_setup_devlink_regions_global() time.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 836021a2d0e0e4c90b895a35bd9c0342071855fb , < 8ccdf5e24b276848eefb2755e05ff0f005a0c4a1 (git)
Affected: 836021a2d0e0e4c90b895a35bd9c0342071855fb , < b3c70dfe51f10df60db2646c08cebd24bcdc5247 (git)
Affected: 836021a2d0e0e4c90b895a35bd9c0342071855fb , < bbb80f004f7a90c3dcaacc982c59967457254a05 (git)
Affected: 836021a2d0e0e4c90b895a35bd9c0342071855fb , < 3665695e3572239dc233216f06b41f40cc771889 (git)
Affected: 836021a2d0e0e4c90b895a35bd9c0342071855fb , < 5f5e95945bb1e08be7655da6acba648274db457d (git)
Affected: 836021a2d0e0e4c90b895a35bd9c0342071855fb , < c84f6ce918a9e6f4996597cbc62536bbf2247c96 (git)
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    Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.25 , ≤ 6.12.* (semver)
Unaffected: 6.14.4 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mv88e6xxx: avoid unregistering devlink regions which were never registered\n\nRussell King reports that a system with mv88e6xxx dereferences a NULL\npointer when unbinding this driver:\nhttps://lore.kernel.org/netdev/Z_lRkMlTJ1KQ0kVX@shell.armlinux.org.uk/\n\nThe crash seems to be in devlink_region_destroy(), which is not NULL\ntolerant but is given a NULL devlink global region pointer.\n\nAt least on some chips, some devlink regions are conditionally registered\nsince the blamed commit, see mv88e6xxx_setup_devlink_regions_global():\n\n\t\tif (cond \u0026\u0026 !cond(chip))\n\t\t\tcontinue;\n\nThese are MV88E6XXX_REGION_STU and MV88E6XXX_REGION_PVT. If the chip\ndoes not have an STU or PVT, it should crash like this.\n\nTo fix the issue, avoid unregistering those regions which are NULL, i.e.\nwere skipped at mv88e6xxx_setup_devlink_regions_global() time."
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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