Linux: Out-of-bounds Read
CVE-2025-38713 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 73f7da507d787b489761a0fa280716f84fa32b2f, 76a4c6636a69d69409aa253b049b1be717a539c5, ccf0ad56a779e6704c0b27f555dec847f50c7557 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.17% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 73f7da507d787b489761a0fa280716f84fa32b2f or 76a4c6636a69d69409aa253b049b1be717a539c5 or ccf0ad56a779e6704c0b27f555dec847f50c7557 or 13604b1d7e7b125fb428cddbec6b8d92baad25d5, whichever matches your release line, or a later version.
- Update SIMATIC CN 4100 to V5.0 or a later version.
- Update Linux Kernel to 5.4.297 or 5.10.241 or 5.15.190 or 6.1.149, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 73f7da507d787b489761a0fa280716f84fa32b2f; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 76a4c6636a69d69409aa253b049b1be717a539c5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, ccf0ad56a779e6704c0b27f555dec847f50c7557; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 13604b1d7e7b125fb428cddbec6b8d92baad25d5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 291bb5d931c6f3cd7227b913302a17be21cf53b0; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, f7534cbfac0a9ffa4fa17cacc6e8b6446dae24ee; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 6f93694bcbc2c2ab3e01cd8fba2f296faf34e6b9; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 up to, but not including, 1ca69007e52a73bd8b84b988b61b319816ca8b01; and 2 more ranges | 73f7da507d787b489761a0fa280716f84fa32b2f, 76a4c6636a69d69409aa253b049b1be717a539c5, ccf0ad56a779e6704c0b27f555dec847f50c7557, 13604b1d7e7b125fb428cddbec6b8d92baad25d5, 291bb5d931c6f3cd7227b913302a17be21cf53b0, f7534cbfac0a9ffa4fa17cacc6e8b6446dae24ee |
| Siemens | SIMATIC CN 4100 | before V5.0 | V5.0 |
| Linux | Linux Kernel | 2.6.12.1 up to, but not including, 5.4.297; 5.5 up to, but not including, 5.10.241; 5.11 up to, but not including, 5.15.190; 5.16 up to, but not including, 6.1.149; 6.2 up to, but not including, 6.6.103; 6.7 up to, but not including, 6.12.43; 6.13 up to, but not including, 6.15.11; 6.16 up to, but not including, 6.16.2; and 1 more ranges | 5.4.297, 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.43 |
| Debian | Debian Linux | 11.0 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.1 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: hfsplus: fix slab-out-of-bounds read in hfsplus_uni2asc() The hfsplus_readdir() method is capable to crash by calling hfsplus_uni2asc(): [ 667.121659][ T9805] ================================================================== [ 667.122651][ T9805] BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x902/0xa10 [ 667.123627][ T9805] Read of size 2 at addr ffff88802592f40c by task repro/9805 [ 667.124578][ T9805] [ 667.124876][ T9805] CPU: 3 UID: 0 PID: 9805 Comm: repro Not tainted 6.16.0-rc3 #1 PREEMPT(full) [ 667.124886][ T9805] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 667.124890][ T9805] Call Trace: [ 667.124893][ T9805] <TASK> [ 667.124896][ T9805] dump_stack_lvl+0x10e/0x1f0 [ 667.124911][ T9805] print_report+0xd0/0x660 [ 667.124920][ T9805] ? __virt_addr_valid+0x81/0x610 [ 667.124928][ T9805] ? __phys_addr+0xe8/0x180 [ 667.124934][ T9805] ? hfsplus_uni2asc+0x902/0xa10 [ 667.124942][ T9805] kasan_report+0xc6/0x100 [ 667.124950][ T9805] ? hfsplus_uni2asc+0x902/0xa10 [ 667.124959][ T9805] hfsplus_uni2asc+0x902/0xa10 [ 667.124966][ T9805] ? hfsplus_bnode_read+0x14b/0x360 [ 667.124974][ T9805] hfsplus_readdir+0x845/0xfc0 [ 667.124984][ T9805] ? __pfx_hfsplus_readdir+0x10/0x10 [ 667.124994][ T9805] ? stack_trace_save+0x8e/0xc0 [ 667.125008][ T9805] ? iterate_dir+0x18b/0xb20 [ 667.125015][ T9805] ? trace_lock_acquire+0x85/0xd0 [ 667.125022][ T9805] ? lock_acquire+0x30/0x80 [ 667.125029][ T9805] ? iterate_dir+0x18b/0xb20 [ 667.125037][ T9805] ? down_read_killable+0x1ed/0x4c0 [ 667.125044][ T9805] ? putname+0x154/0x1a0 [ 667.125051][ T9805] ? __pfx_down_read_killable+0x10/0x10 [ 667.125058][ T9805] ? apparmor_file_permission+0x239/0x3e0 [ 667.125069][ T9805] iterate_dir+0x296/0xb20 [ 667.125076][ T9805] __x64_sys_getdents64+0x13c/0x2c0 [ 667.125084][ T9805] ? __pfx___x64_sys_getdents64+0x10/0x10 [ 667.125091][ T9805] ? __x64_sys_openat+0x141/0x200 [ 667.125126][ T9805] ? __pfx_filldir64+0x10/0x10 [ 667.125134][ T9805] ? do_user_addr_fault+0x7fe/0x12f0 [ 667.125143][ T9805] do_syscall_64+0xc9/0x480 [ 667.125151][ T9805] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 667.125158][ T9805] RIP: 0033:0x7fa8753b2fc9 [ 667.125164][ T9805] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 48 [ 667.125172][ T9805] RSP: 002b:00007ffe96f8e0f8 EFLAGS: 00000217 ORIG_RAX: 00000000000000d9 [ 667.125181][ T9805] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa8753b2fc9 [ 667.125185][ T9805] RDX: 0000000000000400 RSI: 00002000000063c0 RDI: 0000000000000004 [ 667.125190][ T9805] RBP: 00007ffe96f8e110 R08: 00007ffe96f8e110 R09: 00007ffe96f8e110 [ 667.125195][ T9805] R10: 0000000000000000 R11: 0000000000000217 R12: 0000556b1e3b4260 [ 667.125199][ T9805] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 667.125207][ T9805] </TASK> [ 667.125210][ T9805] [ 667.145632][ T9805] Allocated by task 9805: [ 667.145991][ T9805] kasan_save_stack+0x20/0x40 [ 667.146352][ T9805] kasan_save_track+0x14/0x30 [ 667.146717][ T9805] __kasan_kmalloc+0xaa/0xb0 [ 667.147065][ T9805] __kmalloc_noprof+0x205/0x550 [ 667.147448][ T9805] hfsplus_find_init+0x95/0x1f0 [ 667.147813][ T9805] hfsplus_readdir+0x220/0xfc0 [ 667.148174][ T9805] iterate_dir+0x296/0xb20 [ 667.148549][ T9805] __x64_sys_getdents64+0x13c/0x2c0 [ 667.148937][ T9805] do_syscall_64+0xc9/0x480 [ 667.149291][ T9805] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 667.149809][ T9805] [ 667.150030][ T9805] The buggy address belongs to the object at ffff88802592f000 [ 667.150030][ T9805] which belongs to the cache kmalloc-2k of size 2048 [ 667.151282][ T9805] The buggy address is located 0 bytes to the right of [ 667.151282][ T9805] allocated 1036-byte region [ffff88802592f000, ffff88802592f40c) [ 667.1 ---truncated---
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/13604b1d7e7b125fb428cddbec6b8d92baad25d5
- git.kernel.org/stable/c/1ca69007e52a73bd8b84b988b61b319816ca8b01
- git.kernel.org/stable/c/291bb5d931c6f3cd7227b913302a17be21cf53b0
- git.kernel.org/stable/c/6f93694bcbc2c2ab3e01cd8fba2f296faf34e6b9
- git.kernel.org/stable/c/73f7da507d787b489761a0fa280716f84fa32b2f
- git.kernel.org/stable/c/76a4c6636a69d69409aa253b049b1be717a539c5
- git.kernel.org/stable/c/94458781aee6045bd3d0ad4b80b02886b9e2219b
- git.kernel.org/stable/c/ccf0ad56a779e6704c0b27f555dec847f50c7557
- git.kernel.org/stable/c/f7534cbfac0a9ffa4fa17cacc6e8b6446dae24ee
Third-party and government advisories
- lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
Other references
Recent Out-of-bounds Read vulnerabilities
- 8.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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