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CVE-2026-72019— macsec: don't read an unset MAC header in macsec_encrypt()

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macsec_encrypt()函数读取未设置的MAC头，可能导致堆越界读取，进而造成数据泄露。

CVSS 7.3 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c09440f7dcb304002dfced8c0fea289eb25f2da0< b6cec6187b8632423cd99a94fd5e5ba165fa2a33 affected
c09440f7dcb304002dfced8c0fea289eb25f2da0< 3adea1b1c04b57e08a5c12a1f42483760581ce61 affected
c09440f7dcb304002dfced8c0fea289eb25f2da0< dc9ffa1905e72f026d080880a2e4cfc42aa91000 affected
c09440f7dcb304002dfced8c0fea289eb25f2da0< f21fa533a3ed15ada74106aac4b9ddd078fc6b7a affected
c09440f7dcb304002dfced8c0fea289eb25f2da0< e17a42199824973cd8212e95b21ffadf4114a21b affected
c09440f7dcb304002dfced8c0fea289eb25f2da0< 2cf10d042562283ff4ae97c02d0993d4f1b5ea29 affected
c09440f7dcb304002dfced8c0fea289eb25f2da0< c39087ad0b97fc11a3b058dfc8db9fd370762cb9 affected
c09440f7dcb304002dfced8c0fea289eb25f2da0< f5089008f90c0a7c5520dff3934e0af00adf322d affected
… +10 more rows
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I. Basic Information for CVE-2026-72019

Vulnerability Information
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Vulnerability Title
macsec: don't read an unset MAC header in macsec_encrypt()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: macsec: don't read an unset MAC header in macsec_encrypt() macsec_encrypt() reads the Ethernet header via eth_hdr(skb) (skb->head + skb->mac_header) to memmove() the 12 source/destination MAC bytes forward and make room for the SecTAG. On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path the skb reaches the macsec ndo_start_xmit() with the MAC header unset, so eth_hdr(skb) resolves to skb->head + (u16)~0 and the read is out of bounds: a 12-byte heap over-read that is also emitted on the wire as the frame's outer source/destination MAC. KASAN reports a slab-out-of-bounds read in macsec_start_xmit() on 6.0; on current mainline a CONFIG_DEBUG_NET build flags it as an unset mac header in skb_mac_header(). On the TX path the L2 header is at skb->data, so use skb_eth_hdr(), added by commit 96cc4b69581d ("macvlan: do not assume mac_header is set in macvlan_broadcast()") for exactly this purpose.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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macsec_encrypt()函数读取未设置的MAC头，可能导致堆越界读取，进而造成数据泄露。
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 c09440f7dcb304002dfced8c0fea289eb25f2da0 ~ b6cec6187b8632423cd99a94fd5e5ba165fa2a33 -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-72019

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III. Intelligence Information for CVE-2026-72019

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Patches & Fixes for CVE-2026-72019 (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-2026-72451 9.8 CRITICAL xfrm: Fix xfrm state cache insertion race
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-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
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-2026-74433 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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