CVE-2022-49350 (GCVE-0-2022-49350)
Vulnerability from cvelistv5
Published
2025-02-26 02:11
Modified
2025-05-04 08:35
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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)
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 Version: 90eff9096c01ba90cdae504a6b95ee87fe2556a3 |
||||||
|
|||||||||
{
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{
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"version": "5.4.198",
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},
{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mdio: unexport __init-annotated mdio_bus_init()\n\nEXPORT_SYMBOL and __init is a bad combination because the .init.text\nsection is freed up after the initialization. Hence, modules cannot\nuse symbols annotated __init. The access to a freed symbol may end up\nwith kernel panic.\n\nmodpost used to detect it, but it has been broken for a decade.\n\nRecently, I fixed modpost so it started to warn it again, then this\nshowed up in linux-next builds.\n\nThere are two ways to fix it:\n\n - Remove __init\n - Remove EXPORT_SYMBOL\n\nI chose the latter for this case because the only in-tree call-site,\ndrivers/net/phy/phy_device.c is never compiled as modular.\n(CONFIG_PHYLIB is boolean)"
}
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"providerMetadata": {
"dateUpdated": "2025-05-04T08:35:51.230Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/ab64ec2c75683f30ccde9eaaf0761002f901aa12"
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{
"url": "https://git.kernel.org/stable/c/5534bcd7c40299862237c4a8fd9c5031b3db1538"
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{
"url": "https://git.kernel.org/stable/c/7759c3222815b945a94b212bc0c6cdec475cfec2"
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{
"url": "https://git.kernel.org/stable/c/59fa94cddf9eef8d8dae587373eed8b8f4eb11d7"
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{
"url": "https://git.kernel.org/stable/c/f5c68137f1191ba3fcf6260ec71b30be2e2bf4c3"
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"url": "https://git.kernel.org/stable/c/f2f0f8c18b60ca64ff50892ed899cf1c77864755"
},
{
"url": "https://git.kernel.org/stable/c/35b42dce619701f1300fb8498dae82c9bb1f0263"
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],
"title": "net: mdio: unexport __init-annotated mdio_bus_init()",
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"cveId": "CVE-2022-49350",
"datePublished": "2025-02-26T02:11:03.514Z",
"dateReserved": "2025-02-26T02:08:31.544Z",
"dateUpdated": "2025-05-04T08:35:51.230Z",
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