{"id":"DEBIAN-CVE-2021-46959","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 [\u003cb0396f04\u003e] (refcount_warn_saturate) from [\u003cb03c56a4\u003e] (kobject_put+0x90/0x98) [\u003cb03c5614\u003e] (kobject_put) from [\u003cb0447b4c\u003e] (put_device+0x20/0x24)  r4:b6700140 [\u003cb0447b2c\u003e] (put_device) from [\u003cb07515e8\u003e] (devm_spi_release_controller+0x3c/0x40) [\u003cb07515ac\u003e] (devm_spi_release_controller) from [\u003cb045343c\u003e] (release_nodes+0x84/0xc4)  r5:b6700180 r4:b6700100 [\u003cb04533b8\u003e] (release_nodes) from [\u003cb0454160\u003e] (devres_release_all+0x5c/0x60)  r8:b1638c54 r7:b117ad94 r6:b1638c10 r5:b117ad94 r4:b163dc10 [\u003cb0454104\u003e] (devres_release_all) from [\u003cb044e41c\u003e] (__device_release_driver+0x144/0x1ec)  r5:b117ad94 r4:b163dc10 [\u003cb044e2d8\u003e] (__device_release_driver) from [\u003cb044f70c\u003e] (device_driver_detach+0x84/0xa0)  r9:00000000 r8:00000000 r7:b117ad94 r6:b163dc54 r5:b1638c10 r4:b163dc10 [\u003cb044f688\u003e] (device_driver_detach) from [\u003cb044d274\u003e] (unbind_store+0xe4/0xf8)  Instead, determine the devm allocation state as a flag on the controller which is guaranteed to be stable during cleanup.","modified":"2026-09-15T09:02:30.683697967Z","published":"2024-02-29T23:15:07.230Z","upstream":["CVE-2021-46959"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-46959"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-46959.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-46959.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.38-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-46959.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}