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
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
| AND |
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Configuration 3 (hide)
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History
29 Oct 2026, 17:30
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://access.redhat.com/errata/RHBA-2026:20032 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19521 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19540 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19568 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19569 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19664 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19666 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19705 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19711 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:19875 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:20051 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:20054 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:20087 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:20129 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:20130 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:20299 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:20593 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:21656 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:21690 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:21695 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:21702 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:23233 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:23240 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:23245 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:23468 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:23469 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:23470 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:23471 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:24814 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:25044 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:28887 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:33486 - Third Party Advisory | |
| References | () https://access.redhat.com/errata/RHSA-2026:34098 - Third Party Advisory | |
| References | () https://access.redhat.com/security/cve/CVE-2026-46300 - Third Party Advisory | |
| References | () https://bugzilla.redhat.com/show_bug.cgi?id=2477015 - Third Party Advisory | |
| References | () https://cert-portal.siemens.com/productcert/html/ssa-019113.html - Third Party Advisory | |
| References | () 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 - Issue Tracking, Third Party Advisory | |
| References | () 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 |
|
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
