{"id":"CVE-2025-38320","title":"arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()\n\nKASAN reports a stack-out-of-bounds read in regs_get_kernel_stack_nth().\n\nCall Trace:\n[   97.…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 64773b3ea09235168a549a195cba43bb867c4a17","Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 67abac27d806e8f9d4226ec1528540cf73af673a","Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 92750bfe7b0d8dbcaf578c091a65eda1c5f9ad38","Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 01f91d415a8375d85e0c7d3615cd4a168308bb7c","Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 21da6d3561f373898349ca7167c9811c020da695","Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 22f935bc86bdfbde04009f05eee191d220cd8c89","Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 422e565b7889ebfd9c8705a3fc786642afe61fca","Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 39dfc971e42d886e7df01371cd1bef505076d84c","Linux 4.8"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:54:30.021286Z"},"published":"2025-07-10","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:02:32.885Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38320","references":[{"url":"https://git.kernel.org/stable/c/64773b3ea09235168a549a195cba43bb867c4a17"},{"url":"https://git.kernel.org/stable/c/67abac27d806e8f9d4226ec1528540cf73af673a"},{"url":"https://git.kernel.org/stable/c/92750bfe7b0d8dbcaf578c091a65eda1c5f9ad38"},{"url":"https://git.kernel.org/stable/c/01f91d415a8375d85e0c7d3615cd4a168308bb7c"},{"url":"https://git.kernel.org/stable/c/21da6d3561f373898349ca7167c9811c020da695"},{"url":"https://git.kernel.org/stable/c/22f935bc86bdfbde04009f05eee191d220cd8c89"},{"url":"https://git.kernel.org/stable/c/422e565b7889ebfd9c8705a3fc786642afe61fca"},{"url":"https://git.kernel.org/stable/c/39dfc971e42d886e7df01371cd1bef505076d84c"}],"tags":["cve.org"],"epss":0.0021,"epssPercentile":0.11239,"ingestedAt":"2026-11-05T22:38:31.955Z","slug":"CVE-2025-38320","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\narm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()\n\nKASAN reports a stack-out-of-bounds read in regs_get_kernel_stack_nth().\n\nCall Trace:\n[   97.283505] BUG: KASAN: stack-out-of-bounds in regs_get_kernel_stack_nth+0xa8/0xc8\n[   97.284677] Read of size 8 at addr ffff800089277c10 by task 1.sh/2550\n[   97.285732]\n[   97.286067] CPU: 7 PID: 2550 Comm: 1.sh Not tainted 6.6.0+ #11\n[   97.287032] Hardware name: linux,dummy-virt (DT)\n[   97.287815] Call trace:\n[   97.288279]  dump_backtrace+0xa0/0x128\n[   97.288946]  show_stack+0x20/0x38\n[   97.289551]  dump_stack_lvl+0x78/0xc8\n[   97.290203]  print_address_description.constprop.0+0x84/0x3c8\n[   97.291159]  print_report+0xb0/0x280\n[   97.291792]  kasan_report+0x84/0xd0\n[   97.292421]  __asan_load8+0x9c/0xc0\n[   97.293042]  regs_get_kernel_stack_nth+0xa8/0xc8\n[   97.293835]  process_fetch_insn+0x770/0xa30\n[   97.294562]  kprobe_trace_func+0x254/0x3b0\n[   97.295271]  kprobe_dispatcher+0x98/0xe0\n[   97.295955]  kprobe_breakpoint_handler+0x1b0/0x210\n[   97.296774]  call_break_hook+0xc4/0x100\n[   97.297451]  brk_handler+0x24/0x78\n[   97.298073]  do_debug_exception+0xac/0x178\n[   97.298785]  el1_dbg+0x70/0x90\n[   97.299344]  el1h_64_sync_handler+0xcc/0xe8\n[   97.300066]  el1h_64_sync+0x78/0x80\n[   97.300699]  kernel_clone+0x0/0x500\n[   97.301331]  __arm64_sys_clone+0x70/0x90\n[   97.302084]  invoke_syscall+0x68/0x198\n[   97.302746]  el0_svc_common.constprop.0+0x11c/0x150\n[   97.303569]  do_el0_svc+0x38/0x50\n[   97.304164]  el0_svc+0x44/0x1d8\n[   97.304749]  el0t_64_sync_handler+0x100/0x130\n[   97.305500]  el0t_64_sync+0x188/0x190\n[   97.306151]\n[   97.306475] The buggy address belongs to stack of task 1.sh/2550\n[   97.307461]  and is located at offset 0 in frame:\n[   97.308257]  __se_sys_clone+0x0/0x138\n[   97.308910]\n[   97.309241] This frame has 1 object:\n[   97.309873]  [48, 184) 'args'\n[   97.309876]\n[   97.310749] The buggy address belongs to the virtual mapping at\n[   97.310749]  [ffff800089270000, ffff800089279000) created by:\n[   97.310749]  dup_task_struct+0xc0/0x2e8\n[   97.313347]\n[   97.313674] The buggy address belongs to the physical page:\n[   97.314604] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14f69a\n[   97.315885] flags: 0x15ffffe00000000(node=1|zone=2|lastcpupid=0xfffff)\n[   97.316957] raw: 015ffffe00000000 0000000000000000 dead000000000122 0000000000000000\n[   97.318207] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000\n[   97.319445] page dumped because: kasan: bad access detected\n[   97.320371]\n[   97.320694] Memory state around the buggy address:\n[   97.321511]  ffff800089277b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   97.322681]  ffff800089277b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   97.323846] >ffff800089277c00: 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 00 00 00\n[   97.325023]                          ^\n[   97.325683]  ffff800089277c80: 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3\n[   97.326856]  ffff800089277d00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n\nThis issue seems to be related to the behavior of some gcc compilers and\nwas also fixed on the s390 architecture before:\n\n commit d93a855c31b7 (\"s390/ptrace: Avoid KASAN false positives in regs_get_kernel_stack_nth()\")\n\nAs described in that commit, regs_get_kernel_stack_nth() has confirmed that\n`addr` is on the stack, so reading the value at `*addr` should be allowed.\nUse READ_ONCE_NOCHECK() helper to silence the KASAN check for this case.\n\n[will: Use '*addr' as the argument to READ_ONCE_NOCHECK()]\n\n## Affected\n\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 64773b3ea09235168a549a195cba43bb867c4a17`\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 67abac27d806e8f9d4226ec1528540cf73af673a`\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 92750bfe7b0d8dbcaf578c091a65eda1c5f9ad38`\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 01f91d415a8375d85e0c7d3615cd4a168308bb7c`\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 21da6d3561f373898349ca7167c9811c020da695`\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 22f935bc86bdfbde04009f05eee191d220cd8c89`\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 422e565b7889ebfd9c8705a3fc786642afe61fca`\n- `Linux >= 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 < 39dfc971e42d886e7df01371cd1bef505076d84c`\n- `Linux 4.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}