CVE-2021-46959
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-46959
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46959.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-46959
- Related
- Published
- 2024-02-29T23:15:07Z
- Modified
- 2024-09-18T01:00:21Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
spi: Fix use-after-free with devmspialloc_*
We can't rely on the contents of the devres list during spiunregistercontroller(), as the list is already torn down at the time we perform devresfind() for devmspireleasecontroller. This causes devices registered with devmspialloc_{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 refcountwarnsaturate+0x108/0x174 [<b0396f04>] (refcountwarnsaturate) from [<b03c56a4>] (kobjectput+0x90/0x98) [<b03c5614>] (kobjectput) from [<b0447b4c>] (putdevice+0x20/0x24) r4:b6700140 [<b0447b2c>] (putdevice) from [<b07515e8>] (devmspireleasecontroller+0x3c/0x40) [<b07515ac>] (devmspireleasecontroller) from [<b045343c>] (releasenodes+0x84/0xc4) r5:b6700180 r4:b6700100 [<b04533b8>] (releasenodes) from [<b0454160>] (devresreleaseall+0x5c/0x60) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [<b0454104>] (devresreleaseall) from [<b044e41c>] (devicereleasedriver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [<b044e2d8>] (devicereleasedriver) from [<b044f70c>] (devicedriverdetach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [<b044f688>] (devicedriverdetach) from [<b044d274>] (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/001c8e83646ad3b847b18f6ac55a54367d917d74
- https://git.kernel.org/stable/c/28a5529068c51cdf0295ab1e11a99a3a909a03e4
- https://git.kernel.org/stable/c/62bb2c7f2411a0045c24831f11ecacfc35610815
- https://git.kernel.org/stable/c/794aaf01444d4e765e2b067cba01cc69c1c68ed9
- https://git.kernel.org/stable/c/8735248ebb918d25427965f0db07939ed0473ec6
- https://git.kernel.org/stable/c/8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e
- https://git.kernel.org/stable/c/8e029707f50a82c53172359c686b2536ab54e58c
- https://git.kernel.org/stable/c/c7fabe372a9031acd00498bc718ce27c253abfd1
- https://git.kernel.org/stable/c/cee78aa24578edac8cf00513dca618c0acc17cd7
- https://security-tracker.debian.org/tracker/CVE-2021-46959
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source