Answer in brief
CVE-2024-26957 records a Unknown severity vulnerability in s390/zcrypt: fix reference counting on zcrypt card objects. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2024-26957 records a Unknown severity vulnerability in s390/zcrypt: fix reference counting on zcrypt card objects. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e28d2af43614eb86f59812e7221735fc221bbc10 <7e500849fa558879a1cde43f80c7c048c2437058 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <9daddee03de3f231012014dab8ab2b277a116a55 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <6470078ab3d8f222115e11c4ec67351f3031b3dd || >=e28d2af43614eb86f59812e7221735fc221bbc10 <a55677878b93e9ebc31f66d0e2fb93be5e7836a6 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <b7f6c3630eb3f103115ab0d7613588064f665d0d || >=e28d2af43614eb86f59812e7221735fc221bbc10 <a64ab862e84e3e698cd351a87cdb504c7fc575ca || >=e28d2af43614eb86f59812e7221735fc221bbc10 <befb7f889594d23e1b475720cf93efd2f77df000 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <50ed48c80fecbe17218afed4f8bed005c802976c | 7e500849fa558879a1cde43f80c7c048c2437058, 9daddee03de3f231012014dab8ab2b277a116a55, 6470078ab3d8f222115e11c4ec67351f3031b3dd, a55677878b93e9ebc31f66d0e2fb93be5e7836a6, b7f6c3630eb3f103115ab0d7613588064f665d0d, a64ab862e84e3e698cd351a87cdb504c7fc575ca, befb7f889594d23e1b475720cf93efd2f77df000, 394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484, 50ed48c80fecbe17218afed4f8bed005c802976c |
| Linux/Linuxgeneric | 4.10 | Not reported |
| linux/linux_kernelgeneric | >=1da177e4c3f4 <7e500849fa55 || >=1da177e4c3f4 <9daddee03de3 || >=1da177e4c3f4 <6470078ab3d8 || >=1da177e4c3f4 <a55677878b93 || >=1da177e4c3f4 <b7f6c3630eb3 || >=1da177e4c3f4 <a64ab862e84e || >=1da177e4c3f4 <befb7f889594 || >=1da177e4c3f4 <394b6d8bbdf9 || >=1da177e4c3f4 <50ed48c80fec | 7e500849fa55, 9daddee03de3, 6470078ab3d8, a55677878b93, b7f6c3630eb3, a64ab862e84e, befb7f889594, 394b6d8bbdf9, 50ed48c80fec |
Published upstream
May 1, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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---
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e28d2af43614eb86f59812e7221735fc221bbc10 <7e500849fa558879a1cde43f80c7c048c2437058 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <9daddee03de3f231012014dab8ab2b277a116a55 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <6470078ab3d8f222115e11c4ec67351f3031b3dd || >=e28d2af43614eb86f59812e7221735fc221bbc10 <a55677878b93e9ebc31f66d0e2fb93be5e7836a6 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <b7f6c3630eb3f103115ab0d7613588064f665d0d || >=e28d2af43614eb86f59812e7221735fc221bbc10 <a64ab862e84e3e698cd351a87cdb504c7fc575ca || >=e28d2af43614eb86f59812e7221735fc221bbc10 <befb7f889594d23e1b475720cf93efd2f77df000 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484 || >=e28d2af43614eb86f59812e7221735fc221bbc10 <50ed48c80fecbe17218afed4f8bed005c802976c | 7e500849fa558879a1cde43f80c7c048c2437058, 9daddee03de3f231012014dab8ab2b277a116a55, 6470078ab3d8f222115e11c4ec67351f3031b3dd, a55677878b93e9ebc31f66d0e2fb93be5e7836a6, b7f6c3630eb3f103115ab0d7613588064f665d0d, a64ab862e84e3e698cd351a87cdb504c7fc575ca, befb7f889594d23e1b475720cf93efd2f77df000, 394b6d8bbdf9ddee6d5bcf3e1f3e9f23eecd6484, 50ed48c80fecbe17218afed4f8bed005c802976c |
| Linux/Linuxgeneric | 4.10 | Not reported |
| linux/linux_kernelgeneric | >=1da177e4c3f4 <7e500849fa55 || >=1da177e4c3f4 <9daddee03de3 || >=1da177e4c3f4 <6470078ab3d8 || >=1da177e4c3f4 <a55677878b93 || >=1da177e4c3f4 <b7f6c3630eb3 || >=1da177e4c3f4 <a64ab862e84e || >=1da177e4c3f4 <befb7f889594 || >=1da177e4c3f4 <394b6d8bbdf9 || >=1da177e4c3f4 <50ed48c80fec | 7e500849fa55, 9daddee03de3, 6470078ab3d8, a55677878b93, b7f6c3630eb3, a64ab862e84e, befb7f889594, 394b6d8bbdf9, 50ed48c80fec |
Published upstream
May 1, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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---
Quoted source text, attributed separately from HOL analysis.