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CVE-2025-21629— net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net组件存在IPv6扩展头处理问题。

CVSS 8.2 · High EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux a84978a9cda68f0afe3f01d476c68db21526baf1< ac9cfef69565021c9e1022a493a9c40b03e2caf9 affected
c69bc67c1cb211aa390bea6e512bb01b1241fefb< 95ccf006bbc8b59044313b8c309dcf29c546abd4 affected
04c20a9356f283da623903e81e7c6d5df7e4dc3c< d3b7a9c7597b779039a51d7b34116fbe424bf2b7 affected
04c20a9356f283da623903e81e7c6d5df7e4dc3c< 68e068cabd2c6c533ef934c2e5151609cf6ecc6d affected
bcefc3cd7f592a70fcbbbfd7ad1fbc69172ea78b affected
477b35d94a21530046fe91589960732fcf2b29ed affected
a27a5c40ee4cbe00294e2c76160de5f2589061ba affected
9f605135a5c0fe614c2b15197b9ced1e217eca59 affected
… +14 more rows
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I. Basic Information for CVE-2025-21629

Vulnerability Information
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Vulnerability Title
net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets The blamed commit disabled hardware offoad of IPv6 packets with extension headers on devices that advertise NETIF_F_IPV6_CSUM, based on the definition of that feature in skbuff.h: * * - %NETIF_F_IPV6_CSUM * - Driver (device) is only able to checksum plain * TCP or UDP packets over IPv6. These are specifically * unencapsulated packets of the form IPv6|TCP or * IPv6|UDP where the Next Header field in the IPv6 * header is either TCP or UDP. IPv6 extension headers * are not supported with this feature. This feature * cannot be set in features for a device with * NETIF_F_HW_CSUM also set. This feature is being * DEPRECATED (see below). The change causes skb_warn_bad_offload to fire for BIG TCP packets. [ 496.310233] WARNING: CPU: 13 PID: 23472 at net/core/dev.c:3129 skb_warn_bad_offload+0xc4/0xe0 [ 496.310297] ? skb_warn_bad_offload+0xc4/0xe0 [ 496.310300] skb_checksum_help+0x129/0x1f0 [ 496.310303] skb_csum_hwoffload_help+0x150/0x1b0 [ 496.310306] validate_xmit_skb+0x159/0x270 [ 496.310309] validate_xmit_skb_list+0x41/0x70 [ 496.310312] sch_direct_xmit+0x5c/0x250 [ 496.310317] __qdisc_run+0x388/0x620 BIG TCP introduced an IPV6_TLV_JUMBO IPv6 extension header to communicate packet length, as this is an IPv6 jumbogram. But, the feature is only enabled on devices that support BIG TCP TSO. The header is only present for PF_PACKET taps like tcpdump, and not transmitted by physical devices. For this specific case of extension headers that are not transmitted, return to the situation before the blamed commit and support hardware offload. ipv6_has_hopopt_jumbo() tests not only whether this header is present, but also that it is the only extension header before a terminal (L4) header.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于net组件存在IPv6扩展头处理问题。
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 a84978a9cda68f0afe3f01d476c68db21526baf1 ~ ac9cfef69565021c9e1022a493a9c40b03e2caf9 -
Linux Linux 6.12 -

II. Public POCs for CVE-2025-21629

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III. Intelligence Information for CVE-2025-21629

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Patches & Fixes for CVE-2025-21629 (4)

Same Patch Batch · Linux · 2025-01-15 · 32 CVEs total

CVE-2024-57882 9.8 CRITICAL mptcp: fix TCP options overflow.
CVE-2024-36476 9.8 CRITICAL RDMA/rtrs: Ensure 'ib_sge list' is accessible
CVE-2024-57802 9.4 CRITICAL netrom: check buffer length before accessing it
CVE-2024-57883 7.8 HIGH mm: hugetlb: independent PMD page table shared count
CVE-2024-57857 7.8 HIGH RDMA/siw: Remove direct link to net_device
CVE-2024-57801 7.8 HIGH net/mlx5e: Skip restore TC rules for vport rep without loaded flag
CVE-2024-57795 7.8 HIGH RDMA/rxe: Remove the direct link to net_device
CVE-2024-39282 7.8 HIGH net: wwan: t7xx: Fix FSM command timeout issue
CVE-2024-57896 7.8 HIGH btrfs: flush delalloc workers queue before stopping cleaner kthread during unmount
CVE-2024-57893 7.8 HIGH ALSA: seq: oss: Fix races at processing SysEx messages
CVE-2024-57887 7.8 HIGH drm: adv7511: Fix use-after-free in adv7533_attach_dsi()
CVE-2024-57899 7.6 HIGH wifi: mac80211: fix mbss changed flags corruption on 32 bit systems
CVE-2024-57902 7.3 HIGH af_packet: fix vlan_get_tci() vs MSG_PEEK
CVE-2024-57901 7.3 HIGH af_packet: fix vlan_get_protocol_dgram() vs MSG_PEEK
CVE-2024-57895 7.1 HIGH ksmbd: set ATTR_CTIME flags when setting mtime
CVE-2024-57903 net: restrict SO_REUSEPORT to inet sockets
CVE-2024-57884 mm: vmscan: account for free pages to prevent infinite Loop in throttle_direct_reclaim()
CVE-2024-57844 drm/xe: Fix fault on fd close after unbind
CVE-2024-57841 net: fix memory leak in tcp_conn_request()
CVE-2024-57885 mm/kmemleak: fix sleeping function called from invalid context at print message

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21629

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