CVE - CVE-2021-46959

CVE-ID
CVE-2021-46959	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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 [<b0396f04>] (refcount_warn_saturate) from [<b03c56a4>] (kobject_put+0x90/0x98) [<b03c5614>] (kobject_put) from [<b0447b4c>] (put_device+0x20/0x24) r4:b6700140 [<b0447b2c>] (put_device) from [<b07515e8>] (devm_spi_release_controller+0x3c/0x40) [<b07515ac>] (devm_spi_release_controller) from [<b045343c>] (release_nodes+0x84/0xc4) r5:b6700180 r4:b6700100 [<b04533b8>] (release_nodes) from [<b0454160>] (devres_release_all+0x5c/0x60) r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [<b0454104>] (devres_release_all) from [<b044e41c>] (__device_release_driver+0x144/0x1ec) r5:b117ad94 r4:b163dc10 [<b044e2d8>] (__device_release_driver) from [<b044f70c>] (device_driver_detach+0x84/0xa0) r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [<b044f688>] (device_driver_detach) 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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/001c8e83646ad3b847b18f6ac55a54367d917d74 URL:https://git.kernel.org/stable/c/001c8e83646ad3b847b18f6ac55a54367d917d74 MISC:https://git.kernel.org/stable/c/28a5529068c51cdf0295ab1e11a99a3a909a03e4 URL:https://git.kernel.org/stable/c/28a5529068c51cdf0295ab1e11a99a3a909a03e4 MISC:https://git.kernel.org/stable/c/62bb2c7f2411a0045c24831f11ecacfc35610815 URL:https://git.kernel.org/stable/c/62bb2c7f2411a0045c24831f11ecacfc35610815 MISC:https://git.kernel.org/stable/c/794aaf01444d4e765e2b067cba01cc69c1c68ed9 URL:https://git.kernel.org/stable/c/794aaf01444d4e765e2b067cba01cc69c1c68ed9 MISC:https://git.kernel.org/stable/c/8735248ebb918d25427965f0db07939ed0473ec6 URL:https://git.kernel.org/stable/c/8735248ebb918d25427965f0db07939ed0473ec6 MISC:https://git.kernel.org/stable/c/8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e URL:https://git.kernel.org/stable/c/8bf96425c90f5c1dcf3b7b9df568019a1d4b8a0e MISC:https://git.kernel.org/stable/c/8e029707f50a82c53172359c686b2536ab54e58c URL:https://git.kernel.org/stable/c/8e029707f50a82c53172359c686b2536ab54e58c MISC:https://git.kernel.org/stable/c/c7fabe372a9031acd00498bc718ce27c253abfd1 URL:https://git.kernel.org/stable/c/c7fabe372a9031acd00498bc718ce27c253abfd1 MISC:https://git.kernel.org/stable/c/cee78aa24578edac8cf00513dca618c0acc17cd7 URL:https://git.kernel.org/stable/c/cee78aa24578edac8cf00513dca618c0acc17cd7
Assigning CNA
kernel.org
Date Record Created
20240227	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240227)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)