CVE-2021-46959
- Source
- https://cve.org/CVERecord?id=CVE-2021-46959
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-46959.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-46959
- Downstream
- Related
- Published
- 2024-02-29T23:15:07Z
- Modified
- 2026-03-13T05:16:29Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
spi: Fix use-after-free with devm_spi_alloc_*
We can't rely on the contents of the devres list during spi_unregister_controller(), as the list is already torn down at the time we perform devres_find() for devm_spi_release_controller. This causes devices registered with devm_spi_alloc_{master,slave}() to be mistakenly identified as legacy, non-devm managed devices and have their reference counters decremented below 0.
------------[ cut here ]------------ WARNING: CPU: 1 PID: 660 at lib/refcount.c:28 refcount_warn_saturate+0x108/0x174 [] (refcount_warn_saturate) from [] (kobject_put+0x90/0x98) [] (kobject_put) from [] (put_device+0x20/0x24) r4:b6700140 [] (put_device) from [] (devm_spi_release_controller+0x3c/0x40) [] (devm_spi_release_controller) from [] (release_nodes+0x84/0xc4) r5:b6700180 r4:b6700100 [] (release_nodes) from [] (devres_release_all+0x5c/0x60) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [] (devres_release_all) from [] (__device_release_driver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [] (__device_release_driver) from [] (device_driver_detach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [] (device_driver_detach) from [] (unbind_store+0xe4/0xf8)
Instead, determine the devm allocation state as a flag on the controller which is guaranteed to be stable during cleanup.
- References
-
- https://git.kernel.org/stable/c/c7fabe372a9031acd00498bc718ce27c253abfd1
- https://git.kernel.org/stable/c/001c8e83646ad3b847b18f6ac55a54367d917d74
- https://git.kernel.org/stable/c/62bb2c7f2411a0045c24831f11ecacfc35610815
- https://git.kernel.org/stable/c/794aaf01444d4e765e2b067cba01cc69c1c68ed9
- https://git.kernel.org/stable/c/8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e
- https://git.kernel.org/stable/c/8e029707f50a82c53172359c686b2536ab54e58c
- https://git.kernel.org/stable/c/cee78aa24578edac8cf00513dca618c0acc17cd7
- https://git.kernel.org/stable/c/28a5529068c51cdf0295ab1e11a99a3a909a03e4
- https://git.kernel.org/stable/c/8735248ebb918d25427965f0db07939ed0473ec6
Affected packages
Git /
Database specific
source
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-46959.json"
unresolved_ranges
[
{
"events": [
{
"introduced": "4.4.248"
},
{
"fixed": "4.4.271"
}
]
},
{
"events": [
{
"introduced": "4.9.248"
},
{
"fixed": "4.9.271"
}
]
},
{
"events": [
{
"introduced": "4.14.212"
},
{
"fixed": "4.14.233"
}
]
},
{
"events": [
{
"introduced": "4.19.163"
},
{
"fixed": "4.19.191"
}
]
},
{
"events": [
{
"introduced": "5.4.80"
},
{
"fixed": "5.4.119"
}
]
},
{
"events": [
{
"introduced": "5.10"
},
{
"fixed": "5.10.37"
}
]
},
{
"events": [
{
"introduced": "5.11"
},
{
"fixed": "5.11.21"
}
]
},
{
"events": [
{
"introduced": "5.12"
},
{
"fixed": "5.12.4"
}
]
}
]