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CVE-2026-72057— net/sched: act_ct: preserve tc_skb_cb across defragmentation

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net/sched act_ct的tcf_ct_handle_fragments()函数在调用nf_ct_handle_fragments()时未保存和恢复skb->cb，导致IPCB/IP6CB清除了tc_skb_cb/qdisc_skb_cb控制缓冲区，使分片流量丢失pkt_segs等qdisc元数据，可能触发WARN_ON_ONCE()警告，导致系统崩溃。

CVSS 8.2 · High EPSS 0.58% · P45

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux 0d76daf2013ce1da20eab5e26bd81d983e1c18fb< fb080b6f54835d5d4d11ce3122800e6f0f6689e6 affected
ec624fe740b416fb68d536b37fb8eef46f90b5c2< 67d6b00a54446c008f52cf70fc0c2ad0c712f85d affected
ec624fe740b416fb68d536b37fb8eef46f90b5c2< 2400c4b05d58834b994500a9eec90a37db44187c affected
ec624fe740b416fb68d536b37fb8eef46f90b5c2< 5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac affected
ec624fe740b416fb68d536b37fb8eef46f90b5c2< b3d835407846134b0d54637c0281b39bebef831d affected
ec624fe740b416fb68d536b37fb8eef46f90b5c2< f7f45ceb855d9ba1cba594fb3f383255f7013fad affected
ec624fe740b416fb68d536b37fb8eef46f90b5c2< 9092e15defbe6c7bc241c306093ca9d358a578e7 affected
5.15.13< 5.15.217 affected
… +9 more rows
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I. Basic Information for CVE-2026-72057

Vulnerability Information
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Vulnerability Title
net/sched: act_ct: preserve tc_skb_cb across defragmentation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: preserve tc_skb_cb across defragmentation tcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving and restoring skb->cb. The defrag helper clears IPCB/IP6CB, which aliases the tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through act_ct therefore loses qdisc metadata such as pkt_segs and can trigger WARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled. Save and restore the full tc_skb_cb around nf_ct_handle_fragments(), matching the pattern used by ovs_ct_handle_fragments().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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net/sched act_ct的tcf_ct_handle_fragments()函数在调用nf_ct_handle_fragments()时未保存和恢复skb->cb，导致IPCB/IP6CB清除了tc_skb_cb/qdisc_skb_cb控制缓冲区，使分片流量丢失pkt_segs等qdisc元数据，可能触发WARN_ON_ONCE()警告，导致系统崩溃。
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 0d76daf2013ce1da20eab5e26bd81d983e1c18fb ~ fb080b6f54835d5d4d11ce3122800e6f0f6689e6 -
Linux Linux 5.16 -

II. Public POCs for CVE-2026-72057

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III. Intelligence Information for CVE-2026-72057

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Patches & Fixes for CVE-2026-72057 (7)

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

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-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
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-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work
CVE-2026-72436 9.8 CRITICAL netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
CVE-2026-72129 9.8 CRITICAL nvmet-rdma: handle inline data with a nonzero offset
CVE-2026-72130 9.8 CRITICAL nvmet-auth: reject short AUTH_RECEIVE buffers
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72319 9.8 CRITICAL ipvs: ensure inner headers in ICMP errors are in headroom
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72137 9.8 CRITICAL xfrm: nat_keepalive: avoid double free on send error
CVE-2026-74427 9.8 CRITICAL afs: Fix netns teardown to cancel the preallocation charger
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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