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CVE

CVE-2026-46300

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

CVE-2026-46300

net: skbuff: preserve shared-frag marker during coalescing

In the Linux kernel, the following vulnerability has been resolved:

net: skbuff: preserve shared-frag marker during coalescing

skbtrycoalesce() can attach paged frags from @from to @to.  If @from

has SKBFLSHAREDFRAG 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 skbhasshared_frag() before deciding

whether an uncloned nonlinear skb can skip skbcowdata().  If TCP

receive coalescing has moved shared frags into an unmarked skb, ESP can

see skbhasshared_frag() as false and decrypt in place over page-cache

backed frags.

Propagate SKBFLSHAREDFRAG when skbtrycoalesce() 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.8
-
3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

http://www.openwall.com/lists/oss-security/2026/05/13/5, http://www.openwall.com/lists/oss-security/2026/05/21/11, http://www.openwall.com/lists/oss-security/2026/05/21/12, http://www.openwall.com/lists/oss-security/2026/05/21/13, https://cert-portal.siemens.com/productcert/html/ssa-019113.html, https://cert-portal.siemens.com/productcert/html/ssa-082556.html, https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c, https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987, https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111, https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a, https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e, https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0, https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5, https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46300.json, https://www.cisa.gov/known-exploited-vulnerabilities-catalog?fieldcve=CVE-2026-46300, 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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46300.json, https://nvd.nist.gov/vuln/detail/CVE-2026-46300, https://bugzilla.redhat.com/showbug.cgi?id=2477015, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

7.8

CVSS Score
0
10

Basic Information

Base CVSS
7.8
EPSS Probability
0.1613%
EPSS Percentile
0.96932%
Introduced Version
cef401de7be8c4e155c6746bfccf721a4fa5fab9,3.9.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
f84eca5817390257cef78013d0112481c503b4a3,5.10.257,5.15.208,6.1.174,6.6.141,6.12.91,6.18.33,7.0.10,0:4.18.0-553.125.1.el8_10,0:1-12.el8_10,0:1-10.el8_10,0:1-7.el8_10,0:1-5.el8_10,0:1-3.el8_10,0:4.18.0-553.125.1.rt7.466.el8_10,0:5.14.0-687.10.1.el9_8,6.12.0-211.16.1.el10_2,6.1.174-1,6.12.90-1,6.17.0-35.35,6.17.0-1017.17,6.17.0-1018.19,6.17.0-1016.16,6.17.0-1018.18,6.17.0-1014.16,6.17.0-35.35.1,7.0.0-22.22,7.0.0-1006.6,7.0.0-1007.7,7.0.0-1005.5,7.0.0-1009.9,7.0.0-1008.8,7.0.0-1011.11,7.0.0-22.22.1,5.15.0-1109.116~20.04.1,5.15.0-1114.123~20.04.1,5.15.0-1109.118~20.04.1,5.15.0-181.191~20.04.1,5.15.0-1103.106~20.04.1,5.15.0-1104.110~20.04.1,5.15.0-1061.61~20.04.1,5.15.0-1106.112~20.04.1,5.15.0-1103.107~20.04.1,6.8.0-124.124,6.8.0-1057.60,6.17.0-1017.17~24.04.1,6.8.0-1058.64,6.8.0-1058.65,6.8.0-1060.63,6.17.0-1018.19~24.04.1,6.8.0-1055.61,6.8.0-1042.45,6.17.0-35.35~24.04.1,7.0.0-28.28~24.04.1,6.8.0-1057.58,6.8.0-134.134.1,6.8.0-1055.58,6.17.0-1021.21,6.8.0-1055.58.1,6.8.0-1026.26,6.17.0-1024.24,6.8.0-1054.55,6.17.0-1016.16~24.04.1,6.8.0-1057.61,6.17.0-35.35.1~24.04.1,6.8.0-1032.33,5.15.0-181.191,5.15.0-1109.116,6.8.0-1057.60~22.04.1,5.15.0-1114.123,6.8.0-1059.65~22.04.1,6.8.0-1058.65~22.04.1,5.15.0-1109.118,6.8.0-1060.63~22.04.1,5.15.0-1105.111,5.15.0-1092.100,6.8.0-124.124~22.04.1,5.15.0-1103.106,6.8.0-1057.58~22.04.1,5.15.0-1104.110,5.15.0-1101.106,6.8.0-134.134.1~22.04.1,5.15.0-1104.105,6.8.0-1055.58~22.04.1,5.15.0-1061.61,5.15.0-1050.50,5.15.0-1106.112,6.8.0-1054.55~22.04.1,5.15.0-1074.78,0:6.12.0-211.34.1.el10_2,0:6.12.0-204.92.4.2.el10uek,0:6.12.0-203.76.7.1.el10uek,0:6.12.0-202.76.4.4.el10uek,0:6.12.0-204.92.4.2.el9uek,0:5.14.0-687.17.1.el9_8,0:5.15.0-321.202.5.el9uek,0:6.12.0-203.76.7.1.el9uek,0:5.15.0-320.202.8.5.el9uek,0:6.12.0-202.76.4.4.el9uek,0:5.4.17-2136.356.4.1.el8uek,0:5.15.0-321.202.5.el8uek,0:5.4.17-2136.355.3.4.el8uek,0:5.15.0-320.202.8.5.el8uek,0:5.4.17-2136.356.4.1.el7uek,0:5.4.17-2136.355.3.4.el7uek,0:4.14.355-282.729.amzn2,0:1.0-0.amzn2,0:1.0-3.amzn2,0:1.0-2.amzn2,0:1.0-1.amzn2,0:5.4.302-224.471.amzn2,0:5.10.253-252.1016.amzn2,0:5.15.204-143.231.amzn2,1:6.12.83-115.161.amzn2023,1:1.0-0.amzn2023,1:6.18.25-57.109.amzn2023,1:6.1.170-213.321.amzn2023,1:1.0-3.amzn2023,1:1.0-2.amzn2023,1:1.0-1.amzn2023,6.12.92-r0,6.18.34-r0

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