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CVE-2026-72253— netfilter: nf_conntrack_sip: validate skb_dst() before accessing it

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于未验证skb_dst()即访问，导致tc ingress和openvswitch子系统中SIP外部媒体功能被禁用。

CVSS 7.5 · High EPSS 0.60% · P46

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux cae3a2627520c3795b54533c5328b77af3405dbe< 7866116a040b3a23fb094e7d8f7ea3d61b3ac70b affected
cae3a2627520c3795b54533c5328b77af3405dbe< c5ef7228be04518d95591fc5369a9c554b19756d affected
cae3a2627520c3795b54533c5328b77af3405dbe< 0aec339694a56e263d4b22475ff7211d40900830 affected
cae3a2627520c3795b54533c5328b77af3405dbe< e64a48c50a1ff565a98c6a98d82b5b942868e76e affected
cae3a2627520c3795b54533c5328b77af3405dbe< c199ed687c00841daf60e9d131976958583a8c09 affected
cae3a2627520c3795b54533c5328b77af3405dbe< 09755dc62b026076b1d47f83489eb0547c8135e0 affected
cae3a2627520c3795b54533c5328b77af3405dbe< b843a96252f672332837ea2ecb7c8db0acf68e20 affected
cae3a2627520c3795b54533c5328b77af3405dbe< e5e24a365a5e024efef63cc49abb345fbd4852c5 affected
… +10 more rows
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I. Basic Information for CVE-2026-72253

Vulnerability Information
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Vulnerability Title
netfilter: nf_conntrack_sip: validate skb_dst() before accessing it
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: validate skb_dst() before accessing it tc ingress and openvswitch do not guarantee routing information to be available. These subsystems use the conntrack helper infrastructure, and the SIP helper relies on the skb_dst() to be present if sip_external_media is set to 1 (which is disabled by default as a module parameter). This effectively disables the sip_external_media toggle for these subsystems without resulting in a crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于未验证skb_dst()即访问，导致tc ingress和openvswitch子系统中SIP外部媒体功能被禁用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux cae3a2627520c3795b54533c5328b77af3405dbe ~ 7866116a040b3a23fb094e7d8f7ea3d61b3ac70b -
Linux Linux 4.3 -

II. Public POCs for CVE-2026-72253

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III. Intelligence Information for CVE-2026-72253

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Patches & Fixes for CVE-2026-72253 (8)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-72398 9.8 CRITICAL sctp: add INIT verification after cookie unpacking
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72442 9.8 CRITICAL netfilter: flowtable: fix and simplify IP6IP6 tunnel handling
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72253

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