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"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path\n\nIn sev_dbg_crypt(), the per-iteration transfer length is bounded by\nthe source page offset (PAGE_SIZE - s_off) but not by the destination\npage offset (PAGE_SIZE - d_off). When d_off > s_off, the encrypt\npath (__sev_dbg_encrypt_user) performs a read-modify-write using a\nsingle-page intermediate buffer (dst_tpage):\n\n 1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off & 15), 16)\n before issuing the PSP command. If len + (d_off & 15) > PAGE_SIZE,\n the PSP writes beyond the end of the 4096-byte dst_tpage allocation.\n\n 2. The subsequent memcpy()/copy_from_user() into\n page_address(dst_tpage) + (d_off & 15) of 'len' bytes overflows\n by up to 15 bytes under the same condition.\n\nTrigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE -\nthe PSP is instructed to write round_up(4097, 16) = 4112 bytes to\na 4096-byte buffer.\n\nFix by also bounding len by (PAGE_SIZE - d_off), the same check that\nsev_send_update_data() already performs for its single-page guest\nregion.\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214\n\n CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G U W 7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY\n Tainted: [U]=USER, [W]=WARN\n Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025\n Call Trace:\n \n dump_stack_lvl+0x54/0x70\n print_report+0xbc/0x260\n kasan_report+0xa2/0xd0\n kasan_check_range+0x25f/0x2c0\n __asan_memcpy+0x40/0x70\n sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd]\n kvm_vm_ioctl+0x65d/0x6d0 [kvm]\n __se_sys_ioctl+0xb2/0x100\n do_syscall_64+0xe8/0x870\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \n\n The buggy address belongs to the physical page:\n page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb\n memcg:ff11000112827d82\n flags: 0x1400000000000000(node=1|zone=1)\n raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000\n raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >ff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ^\n ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ==================================================================\n Disabling lock debugging due to kernel taint\n\n[sean: add sample KASAN splat, Fixes, and stable@]",
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{
"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path\n\nIn sev_dbg_crypt(), the per-iteration transfer length is bounded by\nthe source page offset (PAGE_SIZE - s_off) but not by the destination\npage offset (PAGE_SIZE - d_off). When d_off > s_off, the encrypt\npath (__sev_dbg_encrypt_user) performs a read-modify-write using a\nsingle-page intermediate buffer (dst_tpage):\n\n 1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off & 15), 16)\n before issuing the PSP command. If len + (d_off & 15) > PAGE_SIZE,\n the PSP writes beyond the end of the 4096-byte dst_tpage allocation.\n\n 2. The subsequent memcpy()/copy_from_user() into\n page_address(dst_tpage) + (d_off & 15) of 'len' bytes overflows\n by up to 15 bytes under the same condition.\n\nTrigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE -\nthe PSP is instructed to write round_up(4097, 16) = 4112 bytes to\na 4096-byte buffer.\n\nFix by also bounding len by (PAGE_SIZE - d_off), the same check that\nsev_send_update_data() already performs for its single-page guest\nregion.\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214\n\n CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G U W 7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY\n Tainted: [U]=USER, [W]=WARN\n Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025\n Call Trace:\n \n dump_stack_lvl+0x54/0x70\n print_report+0xbc/0x260\n kasan_report+0xa2/0xd0\n kasan_check_range+0x25f/0x2c0\n __asan_memcpy+0x40/0x70\n sev_dbg_crypt+0x993/0xd10 [kvm_amd]\n sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd]\n kvm_vm_ioctl+0x65d/0x6d0 [kvm]\n __se_sys_ioctl+0xb2/0x100\n do_syscall_64+0xe8/0x870\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \n\n The buggy address belongs to the physical page:\n page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb\n memcg:ff11000112827d82\n flags: 0x1400000000000000(node=1|zone=1)\n raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000\n raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n >ff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ^\n ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc\n ==================================================================\n Disabling lock debugging due to kernel taint\n\n[sean: add sample KASAN splat, Fixes, and stable@]",
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],
"details":"kernel security update",
"category":"vendor_fix",
"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3317"
}
],
"scores":[
{
"cvss_v3":{
"baseSeverity":"HIGH",
"baseScore":7.8,
"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version":"3.1"
},
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}
],
"threats":[
{
"details":"High",
"category":"impact"
}
],
"title":"CVE-2026-63794"
}
]
}