CVE-2026-31671xfrm_user: fix info leak in build_report()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_report() struct xfrm_user_report is a __u8 proto field followed by a struct xfrm_selector which means there is three "empty" bytes of padding, but the padding is never zeroed before copying to userspace. Fix that up by zeroing the structure before setting individual member variables.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 before d27c02eec529f78055a46a5c9e6c62684382b2d8; from 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 before 716c546e88cfe49d841658240e10cb57bc50a2cc; from 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 before 0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9; from 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 before e0c8542c3d097ed4205ded51868195d5d6ddac62; from 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 before ff5ee507302303b15859753c3e0d67d38fd12c88; 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 builds before 6c55714c931051cd7f4839c19ce0867179fd22fe; 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 builds before 0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72; from 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5 before d10119968d0e1f2b669604baf2a8b5fdb72fa6b4 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.19.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.169; from 6.2 before 6.6.135; from 6.7 before 6.12.82; from 6.13 before 6.18.23; from 6.19 before 6.19.13; 2.6.19; and 7 more ranges | NVD |
References
- https://git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8patch
- https://git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2ccpatch
- https://git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9patch
- https://git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62patch
- https://git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88patch
- https://git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fepatch
- https://git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72patch
- https://git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.