CVE-2026-46300net: skbuff: preserve shared-frag marker during coalescing
Updated under an hour ago ()
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It affects Linux and 13 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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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-123
- 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 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before 3599e6b3cc1ada96883d496a50a210d3afbb6987; from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c; from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5; from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before 78bf6b6bb19541d19fbda6242e7cfe2c682763c0; from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e; from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before 3bd9e113d50034db99d7ef69fd8e5242d15e414a; from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before 3884358a9286b17f389a72b1426fc4547c23c111; from cef401de7be8c4e155c6746bfccf721a4fa5fab9 before f84eca5817390257cef78013d0112481c503b4a3 | CNA record |
Red Hat NVIDIA for RHEL 10 redhat:enterprise_linux_nvidia | from 0:6.12.0-211.8.el10nv not affected; from 0:6.12.0-231.12.el10nv not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:6.12.0-211.16.1.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:6.12.0-55.75.1.el10_0 not affected | CISA ADP |
from 0:4.18.0-305.192.1.el8_4 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 0:4.18.0-305.192.1.el8_4 not affected | CISA ADP |
from 0:4.18.0-372.193.1.el8_6 not affected | CISA ADP | |
from 0:4.18.0-372.193.1.el8_6 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus | from 0:5.14.0-427.126.1.el9_4 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202605271418-0 not affected | CISA ADP |
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 before V3.1.7 | 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 before V3.1.7 | 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 before V3.1.7 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.9 through 5.10.257; from 5.11 before 5.15.208; from 5.16 before 6.1.174; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987patch
- https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641cpatch
- https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5patch
- https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0patch
- https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34epatch
- https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414apatch
- https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111patch
- https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3patch
- http://www.openwall.com/lists/oss-security/2026/05/13/5mailing-list
- http://www.openwall.com/lists/oss-security/2026/05/21/11mailing-list
- http://www.openwall.com/lists/oss-security/2026/05/21/12mailing-list
- http://www.openwall.com/lists/oss-security/2026/05/21/13mailing-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
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.