In the Linux kernel, the following vulnerability has been resolved:
s390/zcrypt: fix reference counting on zcrypt card objects
Tests with hot-plugging crytpo cards on KVM guests with debug kernel build revealed an use after free for the load field of the struct zcrypt_card. The reason was an incorrect reference handling of the zcrypt card object which could lead to a free of the zcrypt card object while it was still in use.
This is an example of the slab message:
kernel: 0x00000000885a7512-0x00000000885a7513 @offset=1298. First byte 0x68 instead of 0x6b
kernel: Allocated in zcrypt_card_alloc+0x36/0x70 [zcrypt] age=18046 cpu=3 pid=43
kernel: kmalloc_trace+0x3f2/0x470
kernel: zcrypt_card_alloc+0x36/0x70 [zcrypt]
kernel: zcrypt_cex4_card_probe+0x26/0x380 [zcrypt_cex4]
kernel: ap_device_probe+0x15c/0x290
kernel: really_probe+0xd2/0x468
kernel: driver_probe_device+0x40/0xf0
kernel: __device_attach_driver+0xc0/0x140
kernel: bus_for_each_drv+0x8c/0xd0
kernel: __device_attach+0x114/0x198
kernel: bus_probe_device+0xb4/0xc8
kernel: device_add+0x4d2/0x6e0
kernel: ap_scan_adapter+0x3d0/0x7c0
kernel: ap_scan_bus+0x5a/0x3b0
kernel: ap_scan_bus_wq_callback+0x40/0x60
kernel: process_one_work+0x26e/0x620
kernel: worker_thread+0x21c/0x440
kernel: Freed in zcrypt_card_put+0x54/0x80 [zcrypt] age=9024 cpu=3 pid=43
kernel: kfree+0x37e/0x418
kernel: zcrypt_card_put+0x54/0x80 [zcrypt]
kernel: ap_device_remove+0x4c/0xe0
kernel: device_release_driver_internal+0x1c4/0x270
kernel: bus_remove_device+0x100/0x188
kernel: device_del+0x164/0x3c0
kernel: device_unregister+0x30/0x90
kernel: ap_scan_adapter+0xc8/0x7c0
kernel: ap_scan_bus+0x5a/0x3b0
kernel: ap_scan_bus_wq_callback+0x40/0x60
kernel: process_one_work+0x26e/0x620
kernel: worker_thread+0x21c/0x440
kernel: kthread+0x150/0x168
kernel: __ret_from_fork+0x3c/0x58
kernel: ret_from_fork+0xa/0x30
kernel: Slab 0x00000372022169c0 objects=20 used=18 fp=0x00000000885a7c88 flags=0x3ffff00000000a00(workingset|slab|node=0|zone=1|lastcpupid=0x1ffff)
kernel: Object 0x00000000885a74b8 @offset=1208 fp=0x00000000885a7c88
kernel: Redzone 00000000885a74b0: bb bb bb bb bb bb bb bb ........
kernel: Object 00000000885a74b8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 00000000885a74c8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 00000000885a74d8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 00000000885a74e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 00000000885a74f8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
kernel: Object 00000000885a7508: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 68 4b 6b 6b 6b a5 kkkkkkkkkkhKkkk.
kernel: Redzone 00000000885a7518: bb bb bb bb bb bb bb bb ........
kernel: Padding 00000000885a756c: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ
kernel: CPU: 0 PID: 387 Comm: systemd-udevd Not tainted 6.8.0-HF #2
kernel: Hardware name: IBM 3931 A01 704 (KVM/Linux)
kernel: Call Trace:
kernel: [<00000000ca5ab5b8>] dump_stack_lvl+0x90/0x120
kernel: [<00000000c99d78bc>] check_bytes_and_report+0x114/0x140
kernel: [<00000000c99d53cc>] check_object+0x334/0x3f8
kernel: [<00000000c99d820c>] alloc_debug_processing+0xc4/0x1f8
kernel: [<00000000c99d852e>] get_partial_node.part.0+0x1ee/0x3e0
kernel: [<00000000c99d94ec>] ___slab_alloc+0xaf4/0x13c8
kernel: [<00000000c99d9e38>] __slab_alloc.constprop.0+0x78/0xb8
kernel: [<00000000c99dc8dc>] __kmalloc+0x434/0x590
kernel: [<00000000c9b4c0ce>] ext4_htree_store_dirent+0x4e/0x1c0
kernel: [<00000000c9b908a2>] htree_dirblock_to_tree+0x17a/0x3f0
kernel:
---truncated---
{ "vanir_signatures": [ { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 465.0, "function_hash": "246307655707364285286079752688050646716" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a55677878b93e9ebc31f66d0e2fb93be5e7836a6", "deprecated": false, "id": "CVE-2024-26957-00cfeb67" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "37263768478704228918514947234674201426", "112664407070399038546460820121432998158", "312606078552331830445598399489082557157", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484", "deprecated": false, "id": "CVE-2024-26957-0392faf6" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "37263768478704228918514947234674201426", "112664407070399038546460820121432998158", "312606078552331830445598399489082557157", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a55677878b93e9ebc31f66d0e2fb93be5e7836a6", "deprecated": false, "id": "CVE-2024-26957-03d57292" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 380.0, "function_hash": "88243083784332870925638056618697511130" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7e500849fa558879a1cde43f80c7c048c2437058", "deprecated": false, "id": "CVE-2024-26957-184fefda" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@b7f6c3630eb3f103115ab0d7613588064f665d0d", "deprecated": false, "id": "CVE-2024-26957-1e20ba5b" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484", "deprecated": false, "id": "CVE-2024-26957-2e1aae28" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 465.0, "function_hash": "246307655707364285286079752688050646716" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484", "deprecated": false, "id": "CVE-2024-26957-3858b221" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@50ed48c80fecbe17218afed4f8bed005c802976c", "deprecated": false, "id": "CVE-2024-26957-386e8c52" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 459.0, "function_hash": "130250757653578687034470421637935396466" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9daddee03de3f231012014dab8ab2b277a116a55", "deprecated": false, "id": "CVE-2024-26957-3f5c2976" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "86356999170367374918023157768616717498", "10914560213037307328332095528365589227", "307259294529152991212665358579659669106", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9daddee03de3f231012014dab8ab2b277a116a55", "deprecated": false, "id": "CVE-2024-26957-4b5cc419" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "37263768478704228918514947234674201426", "112664407070399038546460820121432998158", "312606078552331830445598399489082557157", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a64ab862e84e3e698cd351a87cdb504c7fc575ca", "deprecated": false, "id": "CVE-2024-26957-4d2ab143" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 465.0, "function_hash": "246307655707364285286079752688050646716" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@befb7f889594d23e1b475720cf93efd2f77df000", "deprecated": false, "id": "CVE-2024-26957-4dbe7fd4" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 465.0, "function_hash": "246307655707364285286079752688050646716" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@b7f6c3630eb3f103115ab0d7613588064f665d0d", "deprecated": false, "id": "CVE-2024-26957-522c3f2b" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@9daddee03de3f231012014dab8ab2b277a116a55", "deprecated": false, "id": "CVE-2024-26957-56e1b7a6" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "37263768478704228918514947234674201426", "112664407070399038546460820121432998158", "312606078552331830445598399489082557157", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@befb7f889594d23e1b475720cf93efd2f77df000", "deprecated": false, "id": "CVE-2024-26957-61c7250f" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@befb7f889594d23e1b475720cf93efd2f77df000", "deprecated": false, "id": "CVE-2024-26957-6cf36e6f" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "86356999170367374918023157768616717498", "10914560213037307328332095528365589227", "307259294529152991212665358579659669106", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@6470078ab3d8f222115e11c4ec67351f3031b3dd", "deprecated": false, "id": "CVE-2024-26957-7aa02777" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 465.0, "function_hash": "246307655707364285286079752688050646716" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a64ab862e84e3e698cd351a87cdb504c7fc575ca", "deprecated": false, "id": "CVE-2024-26957-803b49f5" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "86356999170367374918023157768616717498", "10914560213037307328332095528365589227", "307259294529152991212665358579659669106", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7e500849fa558879a1cde43f80c7c048c2437058", "deprecated": false, "id": "CVE-2024-26957-8ab0c81f" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 459.0, "function_hash": "130250757653578687034470421637935396466" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@6470078ab3d8f222115e11c4ec67351f3031b3dd", "deprecated": false, "id": "CVE-2024-26957-9855c51c" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 351.0, "function_hash": "188552700258981258606715406859641378106" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7e500849fa558879a1cde43f80c7c048c2437058", "deprecated": false, "id": "CVE-2024-26957-9f3836a0" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "37263768478704228918514947234674201426", "112664407070399038546460820121432998158", "312606078552331830445598399489082557157", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@b7f6c3630eb3f103115ab0d7613588064f665d0d", "deprecated": false, "id": "CVE-2024-26957-a3dcafc3" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@6470078ab3d8f222115e11c4ec67351f3031b3dd", "deprecated": false, "id": "CVE-2024-26957-b3b8ac13" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_pick_queue" }, "signature_version": "v1", "digest": { "length": 465.0, "function_hash": "246307655707364285286079752688050646716" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@50ed48c80fecbe17218afed4f8bed005c802976c", "deprecated": false, "id": "CVE-2024-26957-b9efa90e" }, { "signature_type": "Line", "target": { "file": "drivers/s390/crypto/zcrypt_api.c" }, "signature_version": "v1", "digest": { "threshold": 0.9, "line_hashes": [ "37263768478704228918514947234674201426", "112664407070399038546460820121432998158", "312606078552331830445598399489082557157", "226001369164361450359942820282591887247", "219660762010482774960705511259988305554", "39387041811714649260383786042555639160", "205967264677462939701492007515725849326", "167395822342270452577540243755386348995" ] }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@50ed48c80fecbe17218afed4f8bed005c802976c", "deprecated": false, "id": "CVE-2024-26957-c0c94a10" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a55677878b93e9ebc31f66d0e2fb93be5e7836a6", "deprecated": false, "id": "CVE-2024-26957-c65b4f85" }, { "signature_type": "Function", "target": { "file": "drivers/s390/crypto/zcrypt_api.c", "function": "zcrypt_drop_queue" }, "signature_version": "v1", "digest": { "length": 304.0, "function_hash": "26302015379495256278778111632112697447" }, "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a64ab862e84e3e698cd351a87cdb504c7fc575ca", "deprecated": false, "id": "CVE-2024-26957-f185a424" } ] }