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Review reviewHigh

CVE-2026-63914

Linux

In the Linux kernel, the following vulnerability has been resolved: xfrm: route MIGRATE notifications to caller's netns xfrm_send_migrate() in net/xfrm/xfrm_user.c and pfkey_send_migrate() in net/key/af_key.c both hardcode &init_net for the multicast that announces a successful XFRM_MSG_MIGRATE / SADB_X_MIGRATE. XFRM_MSG_MIGRATE arrives on a per-netns NETLINK_XFRM socket, and the rest of the xfrm/af_key netlink path was made netns-aware in 2008. The other 14 multicast paths in xfrm_user.c route their event using xs_net(x), xp_net(xp) or sock_net(skb->sk); only the migrate path was missed. T...

CVSS
7.3
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.3

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: xfrm: route MIGRATE notifications to caller's netns xfrm_send_migrate() in net/xfrm/xfrm_user.c and pfkey_send_migrate() in net/key/af_key.c both hardcode &init_net for the multicast that announces a successful XFRM_MSG_MIGRATE / SADB_X_MIGRATE. XFRM_MSG_MIGRATE arrives on a per-netns NETLINK_XFRM socket, and the rest of the xfrm/af_key netlink path was made netns-aware in 2008. The other 14 multicast paths in xfrm_user.c route their event using xs_net(x), xp_net(xp) or sock_net(skb->sk); only the migrate path was missed. T...

Affected product and versions

Product
Linux
Affected versions
>= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < bafc7d0774b9bf52909c70ed990bc5ccf7ec4bad, >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 6df8157547347b5257bf640a0ae3dfc4411e06cd, >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < fe463798343382c8fe9416a95959f005a3c30aa5, >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 00f2c451e57df50b1151d9b2254878f106b7c892, >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < a306cf2ac8849c487791369fad6f216399d000f6, >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 448bb92ca101dde8a6e88b4dc824044b4e341604, >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 26ce8dbf2e23fe4fcc3351d19ef6d3fb703ed126, >= 5c79de6e79cd8ecfbae28886be3ee49044f3a4d4 < 7e2a4f7ca0952820731ef7bdadfc9a9e9d3571b4, >= 2.6.21
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L
CWE
Not available