جزئیات آسیب‌پذیری
CVE-2026-31709
smb: client: validate the whole DACL before rewriting it in cifsacl
شرح رسمی (انگلیسی)
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incoming ACL to rebuild the chmod/chown security descriptor. The original fix only checked that the struct smb_acl header fits before reading dacl_ptr->size or dacl_ptr->num_aces. That avoids the immediate header-field OOB read, but the rewrite helpers still walk ACEs based on pdacl->num_aces with no structural validation of the incoming DACL body. A malicious server can return a truncated DACL that still contains a header, claims one or more ACEs, and then drive replace_sids_and_copy_aces() or set_chmod_dacl() past the validated extent while they compare or copy attacker-controlled ACEs. Factor the DACL structural checks into validate_dacl(), extend them to validate each ACE against the DACL bounds, and use the shared validator before the chmod/chown rebuild paths. parse_dacl() reuses the same validator so the read-side parser and write-side rewrite paths agree on what constitutes a well-formed incoming DACL.
امتیازهای CVSS
| امتیاز | نسخه | منبع | بردار |
|---|---|---|---|
| 8.8بالا | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 7.8بالا | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
محصولات آسیب‌پذیر
| فروشنده | محصول | نسخه‌ها | منبع |
|---|---|---|---|
| Linux | Linux | 5.12 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ≤ v < c2abdebf72000a64603ced84d36ccbd164f11391 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ≤ v < 8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ≤ v < d92f3f0b22414e7515696a02224d0af55e3004a3 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ≤ v < ff0ca46b13b9ef6edbcd238a3b6caacfef8ba0e5 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ≤ v < b78db9bddc84136f6a0bb49e8883cf200dfb87a8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ≤ v < 0a8cf165566ba55a39fd0f4de172119dd646d39a | CVEProject cvelistV5 (CNA) |
| Linux | Linux | bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ≤ v < b8603d9ae6c9087662b098619996bc4a8064319d | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 9 | همه | CVEProject cvelistV5 (CNA) |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | همه | CVEProject cvelistV5 (CNA) |
منابع و راهنماها
۲۰- https://git.kernel.org/stable/c/b8603d9ae6c9087662b098619996bc4a8064319d
- https://git.kernel.org/stable/c/c2abdebf72000a64603ced84d36ccbd164f11391
- https://git.kernel.org/stable/c/8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12
- https://git.kernel.org/stable/c/d92f3f0b22414e7515696a02224d0af55e3004a3
- https://git.kernel.org/stable/c/ff0ca46b13b9ef6edbcd238a3b6caacfef8ba0e5
- https://git.kernel.org/stable/c/b78db9bddc84136f6a0bb49e8883cf200dfb87a8
- https://git.kernel.org/stable/c/0a8cf165566ba55a39fd0f4de172119dd646d39a
- https://access.redhat.com/security/cve/CVE-2026-31709 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2464476 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31709.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:24343 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23329 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:22940 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23237 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23224 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21556 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21706 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21745 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:22900 vendor-advisoryx_refsource_REDHAT
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
اطلاعات
- تاریخ انتشار
- ۱۴۰۵/۰۲/۱۱
- آخرین به‌روزرسانی
- ۱۴۰۵/۰۷/۲۷
- وضعیت
- منتشرشده
- صادرکننده (CNA)
- Linux
پیش‌بینی بهره‌برداری (EPSS)
ارزیابی SSVC (CISA)
- قابل خودکارسازی
- خیر
- وضعیت بهره‌برداری
- ندارد
- اثر فنی
- کامل
ضعف‌ها (CWE)
- CWE-1288Improper Validation of Consistency within Input
- CWE-125Out-of-bounds Read