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CVE-2026-53014— net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir

AI Predicted 7.8 Difficulty: Moderate EPSS 0.12% · P2

Affected Version Matrix 10

VendorProductVersion RangeStatus
LinuxLinux42f39036cda808d3de243192a2cf5125f12f3047< 8fda5174286119addd28473fb2ec5bdf521c05a8affected
42f39036cda808d3de243192a2cf5125f12f3047< 7db3e4e03032261b1b519341123fc30d995478caaffected
42f39036cda808d3de243192a2cf5125f12f3047< 4764953c4b47585eb72797b216b63a831dc0c7e6affected
42f39036cda808d3de243192a2cf5125f12f3047< 4510d140524ca7d6e772db962e013f26f09a63b1affected
6.8affected
< 6.8unaffected
6.12.91≤ 6.12.*unaffected
6.18.33≤ 6.18.*unaffected
… +2 more rows
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I. Basic Information for CVE-2026-53014

Vulnerability Information
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Vulnerability Title
net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir In tcf_blockcast_redir(), when iterating block ports to redirect packets to multiple devices, the mac_header_xmit flag is queried from the wrong device. The loop sends to dev_prev but queries dev_is_mac_header_xmit(dev) — which is the NEXT device in the iteration, not the one being sent to. This causes tcf_mirred_to_dev() to make incorrect decisions about whether to push or pull the MAC header. When the block contains mixed device types (e.g., an ethernet veth and a tunnel device), intermediate devices get the wrong mac_header_xmit flag, leading to skb header corruption. In the worst case, skb_push_rcsum with an incorrect mac_len can exhaust headroom and panic. The last device in the loop is handled correctly (line 365-366 uses dev_is_mac_header_xmit(dev_prev)), confirming this is a copy-paste oversight for the intermediate devices. Fix by using dev_prev instead of dev for the mac_header_xmit query, consistent with the device actually being sent to.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 6.8版本存在安全漏洞，该漏洞源于tcf_blockcast_redir函数中mac_header_xmit标志未正确选择发送设备，可能导致skb头部损坏并引发内核崩溃。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 42f39036cda808d3de243192a2cf5125f12f3047 ~ 8fda5174286119addd28473fb2ec5bdf521c05a8 -
LinuxLinux 6.8 -

II. Public POCs for CVE-2026-53014

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III. Intelligence Information for CVE-2026-53014

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Patches & Fixes for CVE-2026-53014 (4)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-530499.8 CRITICALgfs2: add some missing log locking
CVE-2026-529939.8 CRITICALtipc: fix double-free in tipc_buf_append()
CVE-2026-529899.8 CRITICALnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-529869.8 CRITICALnetfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-529829.8 CRITICALnet: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-530029.8 CRITICALnetfilter: conntrack: remove sprintf usage
CVE-2026-530069.8 CRITICALipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-530459.8 CRITICALmemory: tegra124-emc: Fix dll_change check
CVE-2026-530869.8 CRITICALnet: bcmgenet: fix racing timeout handler
CVE-2026-530469.8 CRITICALksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-529559.8 CRITICALlibceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-530109.8 CRITICALksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-530889.8 CRITICALnet: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-529149.8 CRITICALbatman-adv: fix fragment reassembly length accounting
CVE-2026-530559.8 CRITICALcrypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-529249.8 CRITICALsctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-529319.8 CRITICALbatman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-529999.1 CRITICALnetfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-530439.1 CRITICALocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-529589.1 CRITICALlibceph: Fix potential out-of-bounds access in osdmap_decode()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53014

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