CVE-2023-34319Linux: buffer overrun in netback due to unusual packet
Updated under an hour ago ()
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It affects Linux and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- XEN
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Linux Linux linux:linux (from the name) | consult Xen advisory XSA-432 status unknown | 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 V3.1.0 before V3.1.5 | 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 V3.1.0 before V3.1.5 | 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 V3.1.0 before V3.1.5 | CISA ADP |
xen xen xen:xen | from 3.2.0 | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
linux linux_kernel linux:linux_kernel | from 4.9.336 before 4.10; from 4.14.302 before 4.14.321; from 4.19.269 before 4.19.290; from 5.4.227 before 5.4.252; from 5.10.159 before 5.10.189; from 5.15.83 before 5.15.125; from 6.1.13 before 6.1.44; from 6.2 before 6.4.9 | NVD |
References
- https://xenbits.xenproject.org/xsa/advisory-432.htmlmitigation, patch, vendor-advisory
- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.htmlthird-party-advisory, vdb-entry
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.htmlthird-party-advisory
- https://security.netapp.com/advisory/ntap-20240202-0001/third-party-advisory
- http://xenbits.xen.org/xsa/advisory-432.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.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.