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CVE-2026-72137— xfrm: nat_keepalive: avoid double free on send error

CVSS 9.8 · Critical EPSS 0.63% · P47

Affected Version Matrix 10

VendorProductVersion RangeStatus
LinuxLinuxf531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< d0a4dc7efa825bce60a8da8f7d43c864a159abdeaffected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 5b0c4c916f202b8fd13d12afb6af62b385622f81affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< a8a7e6a9ff8a4c1f067694ddbd44be67fdf36693affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 226f4a490d1a938fc838d8f8c46a4eca864c0d78affected
6.11affected
< 6.11unaffected
6.12.101≤ 6.12.*unaffected
6.18.40≤ 6.18.*unaffected
… +2 more rows
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I. Basic Information for CVE-2026-72137

Vulnerability Information
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Vulnerability Title
xfrm: nat_keepalive: avoid double free on send error
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: nat_keepalive: avoid double free on send error nat_keepalive_send() frees the keepalive skb whenever the IPv4 or IPv6 send helper reports an error. That cleanup is only correct before the skb is handed to the output path. Once ip_build_and_send_pkt() or ip6_xmit() takes ownership, the networking stack may already have consumed the skb before returning an error, so freeing it again is unsafe. Handle the pre-handoff failure cases inside nat_keepalive_send_ipv4() and nat_keepalive_send_ipv6(), where the caller still owns the skb, and keep nat_keepalive_send() responsible only for family dispatch and the unsupported-family cleanup path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae ~ d0a4dc7efa825bce60a8da8f7d43c864a159abde -
LinuxLinux 6.11 -

II. Public POCs for CVE-2026-72137

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III. Intelligence Information for CVE-2026-72137

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Patches & Fixes for CVE-2026-72137 (4)

Same Patch Batch · Linux · 2026-08-15 · 846 CVEs total

CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-724669.8 CRITICALxprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-722499.8 CRITICALnetfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-722489.8 CRITICALnetfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-723819.8 CRITICALksmbd: fix use-after-free of fp->owner.name in durable handle owner check
CVE-2026-724779.8 CRITICALfs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-724739.8 CRITICALxprtrdma: Decouple req recycling from RPC completion
CVE-2026-721309.8 CRITICALnvmet-auth: reject short AUTH_RECEIVE buffers
CVE-2026-722219.8 CRITICALsunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-743769.8 CRITICALmd/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-744019.8 CRITICALdlm: fix add msg handle in send_queue ordered
CVE-2026-744069.8 CRITICALvxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
CVE-2026-721299.8 CRITICALnvmet-rdma: handle inline data with a nonzero offset

Showing top 20 of 846 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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