High 7.8Published May 23, 2026

CVE-2026-46300net: skbuff: preserve shared-frag marker during coalescing

Updated under an hour ago (Oct 27, 2026, 8:40 PM ET)

Does this affect you?

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.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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, CWE-456
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 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

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
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_aus	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
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service redhat:rhel_tus	from 0:4.18.0-372.193.1.el8_6 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions redhat:rhel_e4s	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
1–10 of 14

References

References

https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987	patch
https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c	patch
https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5	patch
https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0	patch
https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e	patch
https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a	patch
https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111	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
1–10 of 25

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.