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
https://access.redhat.com/errata/RHSA-2026:19521
https://access.redhat.com/errata/RHSA-2026:19540
https://access.redhat.com/errata/RHSA-2026:19568
https://access.redhat.com/errata/RHSA-2026:19569
https://access.redhat.com/errata/RHSA-2026:19664
https://access.redhat.com/errata/RHSA-2026:19666
https://access.redhat.com/errata/RHSA-2026:19705
https://access.redhat.com/errata/RHSA-2026:19711
https://access.redhat.com/errata/RHSA-2026:19875
https://access.redhat.com/errata/RHSA-2026:20051
https://access.redhat.com/errata/RHSA-2026:20054
https://access.redhat.com/errata/RHSA-2026:20087
https://access.redhat.com/errata/RHSA-2026:20129
https://access.redhat.com/errata/RHSA-2026:20130
https://access.redhat.com/errata/RHSA-2026:20299
https://access.redhat.com/errata/RHSA-2026:20593
https://access.redhat.com/errata/RHSA-2026:21656
https://access.redhat.com/errata/RHSA-2026:21690
https://access.redhat.com/errata/RHSA-2026:21695
https://access.redhat.com/errata/RHSA-2026:21702
https://access.redhat.com/errata/RHSA-2026:23233
https://access.redhat.com/errata/RHSA-2026:23240
https://access.redhat.com/errata/RHSA-2026:23245
https://access.redhat.com/errata/RHSA-2026:23468
https://access.redhat.com/errata/RHSA-2026:23469
https://access.redhat.com/errata/RHSA-2026:23470
https://access.redhat.com/errata/RHSA-2026:23471
https://access.redhat.com/errata/RHSA-2026:24814
https://access.redhat.com/errata/RHSA-2026:25044
https://access.redhat.com/errata/RHSA-2026:28887
https://access.redhat.com/errata/RHSA-2026:33486
https://access.redhat.com/errata/RHSA-2026:34098
https://access.redhat.com/security/cve/CVE-2026-46300
https://bugzilla.redhat.com/show_bug.cgi?id=2477015
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json
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:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-23 12:17

Updated : 2026-09-08 09:18


NVD link : CVE-2026-46300

Mitre link : CVE-2026-46300

CVE.ORG link : CVE-2026-46300


JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-787

Out-of-bounds Write

CWE-123

Write-what-where Condition