Medium 5.5Published May 28, 2026

CVE-2026-46172ipv6: xfrm6: release dst on error in xfrm6_rcv_encap()

Updated under an hour ago (Oct 27, 2026, 12:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ipv6: xfrm6: release dst on error in xfrm6_rcv_encap() xfrm6_rcv_encap() performs an IPv6 route lookup when the skb does not already have a dst attached. ip6_route_input_lookup() returns a referenced dst entry even when the lookup resolves to an error route. If dst->error is set, xfrm6_rcv_encap() drops the skb without attaching the dst to the skb and without releasing the reference returned by the lookup. Repeated packets hitting this path therefore leak dst entries. Release the dst before jumping to the drop path.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
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 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 before a0721bcd72641c32b281f227a94505b31cf54117; from 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 before a20b34f6e854fe6f2aa82528fae7a88759919eb4; from 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 before 870560015ce6e0d8f841c6a8aba33c44be52c727; from 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 before c2efc4956981066df2fef1cc77391b523db6d8e4; from 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 before 554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13; 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 builds before 9d5047782f9bd2829e529df69209bf3232eb561f; 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 builds before 6a5eec0a2a0e99ec9743cf8f1c4082178811d90a; from 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 before bc0fcb9823cd0894934cf968b525c575833d7078	CNA record
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	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	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	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	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.8 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/a0721bcd72641c32b281f227a94505b31cf54117	patch
https://git.kernel.org/stable/c/a20b34f6e854fe6f2aa82528fae7a88759919eb4	patch
https://git.kernel.org/stable/c/870560015ce6e0d8f841c6a8aba33c44be52c727	patch
https://git.kernel.org/stable/c/c2efc4956981066df2fef1cc77391b523db6d8e4	patch
https://git.kernel.org/stable/c/554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13	patch
https://git.kernel.org/stable/c/9d5047782f9bd2829e529df69209bf3232eb561f	patch
https://git.kernel.org/stable/c/6a5eec0a2a0e99ec9743cf8f1c4082178811d90a	patch
https://git.kernel.org/stable/c/bc0fcb9823cd0894934cf968b525c575833d7078	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
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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.