Riskcovery

CVE-2022-49350

net: mdio: unexport __init-annotated mdio_bus_init()

State
Published
Severity
Not scored
Published
Feb 26, 2025
Updated
May 11, 2026
Reserved
Feb 26, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

net: mdio: unexport __init-annotated mdio_bus_init()

EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic.

modpost used to detect it, but it has been broken for a decade.

Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds.

There are two ways to fix it:

- Remove __init - Remove EXPORT_SYMBOL

I chose the latter for this case because the only in-tree call-site, drivers/net/phy/phy_device.c is never compiled as modular. (CONFIG_PHYLIB is boolean)

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before ab64ec2c75683f30ccde9eaaf0761002f901aa12Affected
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before 5534bcd7c40299862237c4a8fd9c5031b3db1538Affected
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before 6a90a44d53428a3bf01bd80df9ba78b19959270cAffected
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before 7759c3222815b945a94b212bc0c6cdec475cfec2Affected
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before 59fa94cddf9eef8d8dae587373eed8b8f4eb11d7Affected
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before f5c68137f1191ba3fcf6260ec71b30be2e2bf4c3Affected
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before f2f0f8c18b60ca64ff50892ed899cf1c77864755Affected
  • 90eff9096c01ba90cdae504a6b95ee87fe2556a3 to before 35b42dce619701f1300fb8498dae82c9bb1f0263Affected
LinuxLinux
  • 4.12Affected
  • before 4.12Not affected
  • 4.14.283 through 4.14.*Not affected
  • 4.19.247 through 4.19.*Not affected
  • 5.4.198 through 5.4.*Not affected
  • 5.10.122 through 5.10.*Not affected
  • 5.15.47 through 5.15.*Not affected
  • 5.17.15 through 5.17.*Not affected
  • 5.18.4 through 5.18.*Not affected
  • 5.19 and laterNot affected

References

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