CVE-2025-38320
arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()
In the Linux kernel, the following vulnerability has been resolved: arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth() KASAN reports a stack-out-of-bounds read in regs_get_kernel_stack_nth(). Call Trace: [ 97.283505] BUG: KASAN: stack-out-of-bounds in regs_get_kernel_stack_nth+0xa8/0xc8 [ 97.284677] Read of size 8 at addr ffff800089277c10 by task 1.sh/2550 [ 97.285732] [ 97.286067] CPU: 7 PID: 2550 Comm: 1.sh Not tainted 6.6.0+ #11 [ 97.287032] Hardware name: linux,dummy-virt (DT) [ 97.287815] Call trace: [ 97.288279] dump_backtrace+0xa0/0x128 [ 97.288946] show_stack+0x20/0x38 [ 97.289551] dump_stack_lvl+0x78/0xc8 [ 97.290203] print_address_description.constprop.0+0x84/0x3c8 [ 97.291159] print_report+0xb0/0x280 [ 97.291792] kasan_report+0x84/0xd0 [ 97.292421] __asan_load8+0x9c/0xc0 [ 97.293042] regs_get_kernel_stack_nth+0xa8/0xc8 [ 97.293835] process_fetch_insn+0x770/0xa30 [ 97.294562] kprobe_trace_func+0x254/0x3b0 [ 97.295271] kprobe_dispatcher+0x98/0xe0 [ 97.295955] kprobe_breakpoint_handler+0x1b0/0x210 [ 97.296774] call_break_hook+0xc4/0x100 [ 97.297451] brk_handler+0x24/0x78 [ 97.298073] do_debug_exception+0xac/0x178 [ 97.298785] el1_dbg+0x70/0x90 [ 97.299344] el1h_64_sync_handler+0xcc/0xe8 [ 97.300066] el1h_64_sync+0x78/0x80 [ 97.300699] kernel_clone+0x0/0x500 [ 97.301331] __arm64_sys_clone+0x70/0x90 [ 97.302084] invoke_syscall+0x68/0x198 [ 97.302746] el0_svc_common.constprop.0+0x11c/0x150 [ 97.303569] do_el0_svc+0x38/0x50 [ 97.304164] el0_svc+0x44/0x1d8 [ 97.304749] el0t_64_sync_handler+0x100/0x130 [ 97.305500] el0t_64_sync+0x188/0x190 [ 97.306151] [ 97.306475] The buggy address belongs to stack of task 1.sh/2550 [ 97.307461] and is located at offset 0 in frame: [ 97.308257] __se_sys_clone+0x0/0x138 [ 97.308910] [ 97.309241] This frame has 1 object: [ 97.309873] [48, 184) 'args' [ 97.309876] [ 97.310749] The buggy address belongs to the virtual mapping at [ 97.310749] [ffff800089270000, ffff800089279000) created by: [ 97.310749] dup_task_struct+0xc0/0x2e8 [ 97.313347] [ 97.313674] The buggy address belongs to the physical page: [ 97.314604] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14f69a [ 97.315885] flags: 0x15ffffe00000000(node=1|zone=2|lastcpupid=0xfffff) [ 97.316957] raw: 015ffffe00000000 0000000000000000 dead000000000122 0000000000000000 [ 97.318207] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 [ 97.319445] page dumped because: kasan: bad access detected [ 97.320371] [ 97.320694] Memory state around the buggy address: [ 97.321511] ffff800089277b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 97.322681] ffff800089277b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 97.323846] >ffff800089277c00: 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 00 00 00 [ 97.325023] ^ [ 97.325683] ffff800089277c80: 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 [ 97.326856] ffff800089277d00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 This issue seems to be related to the behavior of some gcc compilers and was also fixed on the s390 architecture before: commit d93a855c31b7 ("s390/ptrace: Avoid KASAN false positives in regs_get_kernel_stack_nth()") As described in that commit, regs_get_kernel_stack_nth() has confirmed that `addr` is on the stack, so reading the value at `*addr` should be allowed. Use READ_ONCE_NOCHECK() helper to silence the KASAN check for this case. [will: Use '*addr' as the argument to READ_ONCE_NOCHECK()]
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 64773b3ea09235168a549a195cba43bb867c4a17 (affected, git) ≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 67abac27d806e8f9d4226ec1528540cf73af673a (affected, git) ≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 92750bfe7b0d8dbcaf578c091a65eda1c5f9ad38 (affected, git) ≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 01f91d415a8375d85e0c7d3615cd4a168308bb7c (affected, git) ≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 21da6d3561f373898349ca7167c9811c020da695 (affected, git) ≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 22f935bc86bdfbde04009f05eee191d220cd8c89 (affected, git) ≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 422e565b7889ebfd9c8705a3fc786642afe61fca (affected, git) ≥ 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7; < 39dfc971e42d886e7df01371cd1bef505076d84c (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.8 (affected) ≥ 0; < 4.8 (unaffected, semver) ≥ 5.4.295; ≤ 5.4.* (unaffected, semver) ≥ 5.10.239; ≤ 5.10.* (unaffected, semver) ≥ 5.15.186; ≤ 5.15.* (unaffected, semver) ≥ 6.1.142; ≤ 6.1.* (unaffected, semver) ≥ 6.6.95; ≤ 6.6.* (unaffected, semver) ≥ 6.12.35; ≤ 6.12.* (unaffected, semver) ≥ 6.15.4; ≤ 6.15.* (unaffected, semver) ≥ 6.16; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/64773b3ea09235168a549a195cba43bb867c4a17CNA: Linux
- https://git.kernel.org/stable/c/67abac27d806e8f9d4226ec1528540cf73af673aCNA: Linux
- https://git.kernel.org/stable/c/92750bfe7b0d8dbcaf578c091a65eda1c5f9ad38CNA: Linux
- https://git.kernel.org/stable/c/01f91d415a8375d85e0c7d3615cd4a168308bb7cCNA: Linux
- https://git.kernel.org/stable/c/21da6d3561f373898349ca7167c9811c020da695CNA: Linux
- https://git.kernel.org/stable/c/22f935bc86bdfbde04009f05eee191d220cd8c89CNA: Linux
- https://git.kernel.org/stable/c/422e565b7889ebfd9c8705a3fc786642afe61fcaCNA: Linux
- https://git.kernel.org/stable/c/39dfc971e42d886e7df01371cd1bef505076d84cCNA: Linux
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlADP: CVE
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlADP: CVE
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