CVE-2026-46172
ipv6: xfrm6: release dst on error in xfrm6_rcv_encap()
Description
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.
INFO
Published Date :
May 28, 2026, 10:16 a.m.
Last Modified :
June 10, 2026, 9:12 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Release dst entry before dropping skb.
- Apply kernel patch to fix memory leak.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46172.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46172 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46172
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46172 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46172 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 10, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *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:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.30 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.7 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.88 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.140 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.8 up to (excluding) 5.10.258 Added Reference Type kernel.org: https://git.kernel.org/stable/c/554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6a5eec0a2a0e99ec9743cf8f1c4082178811d90a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/870560015ce6e0d8f841c6a8aba33c44be52c727 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9d5047782f9bd2829e529df69209bf3232eb561f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a0721bcd72641c32b281f227a94505b31cf54117 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a20b34f6e854fe6f2aa82528fae7a88759919eb4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/bc0fcb9823cd0894934cf968b525c575833d7078 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c2efc4956981066df2fef1cc77391b523db6d8e4 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 01, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/870560015ce6e0d8f841c6a8aba33c44be52c727 Added Reference https://git.kernel.org/stable/c/a0721bcd72641c32b281f227a94505b31cf54117 Added Reference https://git.kernel.org/stable/c/a20b34f6e854fe6f2aa82528fae7a88759919eb4 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2026
Action Type Old Value New Value Added Description 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. Added Reference https://git.kernel.org/stable/c/554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13 Added Reference https://git.kernel.org/stable/c/6a5eec0a2a0e99ec9743cf8f1c4082178811d90a Added Reference https://git.kernel.org/stable/c/9d5047782f9bd2829e529df69209bf3232eb561f Added Reference https://git.kernel.org/stable/c/bc0fcb9823cd0894934cf968b525c575833d7078 Added Reference https://git.kernel.org/stable/c/c2efc4956981066df2fef1cc77391b523db6d8e4