CVE-2026-46300

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.
References
Link Resource
https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c Patch
https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987 Patch
https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111 Patch
https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a Patch
https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e Patch
https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0 Patch
https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 Patch
https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3 Patch
http://www.openwall.com/lists/oss-security/2026/05/13/5 Mailing List
http://www.openwall.com/lists/oss-security/2026/05/21/11 Mailing List
http://www.openwall.com/lists/oss-security/2026/05/21/12 Mailing List
http://www.openwall.com/lists/oss-security/2026/05/21/13 Mailing List
https://access.redhat.com/errata/RHBA-2026:20032 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19521 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19540 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19568 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19569 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19664 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19666 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19705 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19711 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:19875 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20051 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20054 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20087 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20129 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20130 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20299 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20593 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:21656 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:21690 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:21695 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:21702 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23233 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23240 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23245 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23468 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23469 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23470 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:23471 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:24814 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:25044 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:28887 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:33486 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:34098 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-46300 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2477015 Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-019113.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json Issue Tracking Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-46300 US Government Resource
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*

Configuration 2 (hide)

AND
cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp:-:*:*:*:*:*:*:*

Configuration 3 (hide)

OR cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_aus:8.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_aus:8.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:9.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:9.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_tus:8.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_tus:8.8:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:8.8:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.4:*:*:*:*:*:*:*

History

29 Oct 2026, 17:30

Type Values Removed Values Added
References () https://access.redhat.com/errata/RHBA-2026:20032 - () https://access.redhat.com/errata/RHBA-2026:20032 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19521 - () https://access.redhat.com/errata/RHSA-2026:19521 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19540 - () https://access.redhat.com/errata/RHSA-2026:19540 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19568 - () https://access.redhat.com/errata/RHSA-2026:19568 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19569 - () https://access.redhat.com/errata/RHSA-2026:19569 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19664 - () https://access.redhat.com/errata/RHSA-2026:19664 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19666 - () https://access.redhat.com/errata/RHSA-2026:19666 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19705 - () https://access.redhat.com/errata/RHSA-2026:19705 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19711 - () https://access.redhat.com/errata/RHSA-2026:19711 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:19875 - () https://access.redhat.com/errata/RHSA-2026:19875 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:20051 - () https://access.redhat.com/errata/RHSA-2026:20051 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:20054 - () https://access.redhat.com/errata/RHSA-2026:20054 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:20087 - () https://access.redhat.com/errata/RHSA-2026:20087 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:20129 - () https://access.redhat.com/errata/RHSA-2026:20129 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:20130 - () https://access.redhat.com/errata/RHSA-2026:20130 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:20299 - () https://access.redhat.com/errata/RHSA-2026:20299 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:20593 - () https://access.redhat.com/errata/RHSA-2026:20593 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:21656 - () https://access.redhat.com/errata/RHSA-2026:21656 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:21690 - () https://access.redhat.com/errata/RHSA-2026:21690 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:21695 - () https://access.redhat.com/errata/RHSA-2026:21695 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:21702 - () https://access.redhat.com/errata/RHSA-2026:21702 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:23233 - () https://access.redhat.com/errata/RHSA-2026:23233 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:23240 - () https://access.redhat.com/errata/RHSA-2026:23240 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:23245 - () https://access.redhat.com/errata/RHSA-2026:23245 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:23468 - () https://access.redhat.com/errata/RHSA-2026:23468 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:23469 - () https://access.redhat.com/errata/RHSA-2026:23469 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:23470 - () https://access.redhat.com/errata/RHSA-2026:23470 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:23471 - () https://access.redhat.com/errata/RHSA-2026:23471 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:24814 - () https://access.redhat.com/errata/RHSA-2026:24814 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:25044 - () https://access.redhat.com/errata/RHSA-2026:25044 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:28887 - () https://access.redhat.com/errata/RHSA-2026:28887 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:33486 - () https://access.redhat.com/errata/RHSA-2026:33486 - Third Party Advisory
References () https://access.redhat.com/errata/RHSA-2026:34098 - () https://access.redhat.com/errata/RHSA-2026:34098 - Third Party Advisory
References () https://access.redhat.com/security/cve/CVE-2026-46300 - () https://access.redhat.com/security/cve/CVE-2026-46300 - Third Party Advisory
References () https://bugzilla.redhat.com/show_bug.cgi?id=2477015 - () https://bugzilla.redhat.com/show_bug.cgi?id=2477015 - Third Party Advisory
References () https://cert-portal.siemens.com/productcert/html/ssa-019113.html - () https://cert-portal.siemens.com/productcert/html/ssa-019113.html - Third Party Advisory
References () https://cert-portal.siemens.com/productcert/html/ssa-082556.html - () https://cert-portal.siemens.com/productcert/html/ssa-082556.html - Third Party Advisory
References () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json - () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json - Issue Tracking, Third Party Advisory
References () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-46300 - () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-46300 - US Government Resource
CPE cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_aus:8.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:9.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:9.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.4:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_aus:8.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_tus:8.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_tus:8.8:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:8.8:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
First Time Redhat enterprise Linux Tus
Siemens
Redhat enterprise Linux Eus
Siemens simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp
Redhat enterprise Linux
Redhat enterprise Linux Update Services For Sap Solutions
Siemens simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware
Redhat enterprise Linux Aus
Redhat
Redhat openshift Container Platform

28 Oct 2026, 20:17

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-46300 -

19 Oct 2026, 20:18

Type Values Removed Values Added
CWE CWE-456

Information

Published : 2026-05-23 12:17

Updated : 2026-10-29 17:30


NVD link : CVE-2026-46300

Mitre link : CVE-2026-46300

CVE.ORG link : CVE-2026-46300


JSON object : View

Products Affected

redhat

  • enterprise_linux_aus
  • openshift_container_platform
  • enterprise_linux_eus
  • enterprise_linux_tus
  • enterprise_linux
  • enterprise_linux_update_services_for_sap_solutions

siemens

  • simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware
  • simatic_s7-1500_cpu_1518-4_pn\/dp_mfp

linux

  • linux_kernel
CWE
CWE-787

Out-of-bounds Write

CWE-456

Missing Initialization of a Variable

CWE-123

Write-what-where Condition