{"id":"CVE-2024-26957","revision":"0b9b9d6bd001470bbd7e9235f694afd9","records":[{"revision":"0b9b9d6bd001470bbd7e9235f694afd9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-26957","aliases":[],"title":"s390/zcrypt: fix reference counting on zcrypt card objects","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: fix reference counting on zcrypt card objects\n\nTests with hot-plugging crytpo cards on KVM guests with debug\nkernel build revealed an use after free for the load field of\nthe struct zcrypt_card. The reason was an incorrect reference\nhandling of the zcrypt card object which could lead to a free\nof the zcrypt card object while it was still in use.\n\nThis is an example of the slab message:\n\n kernel: 0x00000000885a7512-0x00000000885a7513 @offset=1298. First byte 0x68 instead of 0x6b\n kernel: Allocated in zcrypt_card_alloc+0x36/0x70 [zcrypt] age=18046 cpu=3 pid=43\n kernel: kmalloc_trace+0x3f2/0x470\n kernel: zcrypt_card_alloc+0x36/0x70 [zcrypt]\n kernel: zcrypt_cex4_card_probe+0x26/0x380 [zcrypt_cex4]\n kernel: ap_device_probe+0x15c/0x290\n kernel: really_probe+0xd2/0x468\n kernel: driver_probe_device+0x40/0xf0\n kernel: __device_attach_driver+0xc0/0x140\n kernel: bus_for_each_drv+0x8c/0xd0\n kernel: __device_attach+0x114/0x198\n kernel: bus_probe_device+0xb4/0xc8\n kernel: device_add+0x4d2/0x6e0\n kernel: ap_scan_adapter+0x3d0/0x7c0\n kernel: ap_scan_bus+0x5a/0x3b0\n kernel: ap_scan_bus_wq_callback+0x40/0x60\n kernel: process_one_work+0x26e/0x620\n kernel: worker_thread+0x21c/0x440\n kernel: Freed in zcrypt_card_put+0x54/0x80 [zcrypt] age=9024 cpu=3 pid=43\n kernel: kfree+0x37e/0x418\n kernel: zcrypt_card_put+0x54/0x80 [zcrypt]\n kernel: ap_device_remove+0x4c/0xe0\n kernel: device_release_driver_internal+0x1c4/0x270\n kernel: bus_remove_device+0x100/0x188\n kernel: device_del+0x164/0x3c0\n kernel: device_unregister+0x30/0x90\n kernel: ap_scan_adapter+0xc8/0x7c0\n kernel: ap_scan_bus+0x5a/0x3b0\n kernel: ap_scan_bus_wq_callback+0x40/0x60\n kernel: process_one_work+0x26e/0x620\n kernel: worker_thread+0x21c/0x440\n kernel: kthread+0x150/0x168\n kernel: __ret_from_fork+0x3c/0x58\n kernel: ret_from_fork+0xa/0x30\n kernel: Slab 0x00000372022169c0 objects=20 used=18 fp=0x00000000885a7c88 flags=0x3ffff00000000a00(workingset|slab|node=0|zone=1|lastcpupid=0x1ffff)\n kernel: Object 0x00000000885a74b8 @offset=1208 fp=0x00000000885a7c88\n kernel: Redzone 00000000885a74b0: bb bb bb bb bb bb bb bb ........\n kernel: Object 00000000885a74b8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk\n kernel: Object 00000000885a74c8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk\n kernel: Object 00000000885a74d8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk\n kernel: Object 00000000885a74e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk\n kernel: Object 00000000885a74f8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk\n kernel: Object 00000000885a7508: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 68 4b 6b 6b 6b a5 kkkkkkkkkkhKkkk.\n kernel: Redzone 00000000885a7518: bb bb bb bb bb bb bb bb ........\n kernel: Padding 00000000885a756c: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ\n kernel: CPU: 0 PID: 387 Comm: systemd-udevd Not tainted 6.8.0-HF #2\n kernel: Hardware name: IBM 3931 A01 704 (KVM/Linux)\n kernel: Call Trace:\n kernel: [<00000000ca5ab5b8>] dump_stack_lvl+0x90/0x120\n kernel: [<00000000c99d78bc>] check_bytes_and_report+0x114/0x140\n kernel: [<00000000c99d53cc>] check_object+0x334/0x3f8\n kernel: [<00000000c99d820c>] alloc_debug_processing+0xc4/0x1f8\n kernel: [<00000000c99d852e>] get_partial_node.part.0+0x1ee/0x3e0\n kernel: [<00000000c99d94ec>] ___slab_alloc+0xaf4/0x13c8\n kernel: [<00000000c99d9e38>] __slab_alloc.constprop.0+0x78/0xb8\n kernel: [<00000000c99dc8dc>] __kmalloc+0x434/0x590\n kernel: [<00000000c9b4c0ce>] ext4_htree_store_dirent+0x4e/0x1c0\n kernel: [<00000000c9b908a2>] htree_dirblock_to_tree+0x17a/0x3f0\n kernel: \n---truncated---","state":0,"publishedAt":"2024-05-01T05:19:00.134+00:00","modifiedAt":"2026-10-15T00:39:34.291+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/s390/crypto/zcrypt_api.c\"\n ],\n \"versions\": [\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"7e500849fa558879a1cde43f80c7c048c2437058\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"9daddee03de3f231012014dab8ab2b277a116a55\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"6470078ab3d8f222115e11c4ec67351f3031b3dd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"a55677878b93e9ebc31f66d0e2fb93be5e7836a6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"b7f6c3630eb3f103115ab0d7613588064f665d0d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"a64ab862e84e3e698cd351a87cdb504c7fc575ca\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"befb7f889594d23e1b475720cf93efd2f77df000\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e28d2af43614eb86f59812e7221735fc221bbc10\",\n \"lessThan\": \"50ed48c80fecbe17218afed4f8bed005c802976c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/s390/crypto/zcrypt_api.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.312\",\n \"lessThanOrEqual\": \"4.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.274\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.215\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.154\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.84\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.24\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.7.12\",\n \"lessThanOrEqual\": \"6.7.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.8.3\",\n \"lessThanOrEqual\": \"6.8.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.9\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7e500849fa558879a1cde43f80c7c048c2437058","https://git.kernel.org/stable/c/9daddee03de3f231012014dab8ab2b277a116a55","https://git.kernel.org/stable/c/6470078ab3d8f222115e11c4ec67351f3031b3dd","https://git.kernel.org/stable/c/a55677878b93e9ebc31f66d0e2fb93be5e7836a6","https://git.kernel.org/stable/c/b7f6c3630eb3f103115ab0d7613588064f665d0d","https://git.kernel.org/stable/c/a64ab862e84e3e698cd351a87cdb504c7fc575ca","https://git.kernel.org/stable/c/befb7f889594d23e1b475720cf93efd2f77df000","https://git.kernel.org/stable/c/394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484","https://git.kernel.org/stable/c/50ed48c80fecbe17218afed4f8bed005c802976c"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-26957","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-26957","identifiers":["CVE-2024-26957"]},"retained":false,"historicalAffected":[]}],"coverage":[]}