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CVE-2026-43057— net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback

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IPV6_CSUM GSO回退时未正确处理隧道数据包，可能导致隧道数据包校验和错误。

CVSS 7.5 · High EPSS 0.81% · P56

Possible ATT&CK Techniques 1 AI

T1205.001 · Port Knocking

Affected Version Matrix 19

VendorProduct Version RangeStatus
Linux Linux a0478d7e888028f85fa7785ea838ce0ca09398e2< 2094a7cf91b71367b649f991aacc7b579f793d0b affected
2156d9e9f2e483c8c3906c0ea57ea312c1424235< ed71cf465c75f5688b07a35d373cd1d6b589c8ea affected
041e2f945f82fdbd6fff577b79c33469430297aa< 33670f780e0120c3dacda188c512bbffe0b6044c affected
864e3396976ef41de6cc7bc366276bf4e084fff2< a98b78116a27e2a57b696b569b2cb431c95cf9b6 affected
864e3396976ef41de6cc7bc366276bf4e084fff2< 732fdeb2987c94b439d51f5cb9addddc2fc48c42 affected
864e3396976ef41de6cc7bc366276bf4e084fff2< c4336a07eb6b2526dc2b62928b5104b41a7f81f5 affected
794ddbb7b63b6828c75967b9bcd43b086716e7a1 affected
6.1.149< 6.1.168 affected
… +11 more rows
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I. Basic Information for CVE-2026-43057

Vulnerability Information
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Vulnerability Title
net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback NETIF_F_IPV6_CSUM only advertises support for checksum offload of packets without IPv6 extension headers. Packets with extension headers must fall back onto software checksumming. Since TSO depends on checksum offload, those must revert to GSO. The below commit introduces that fallback. It always checks network header length. For tunneled packets, the inner header length must be checked instead. Extend the check accordingly. A special case is tunneled packets without inner IP protocol. Such as RFC 6951 SCTP in UDP. Those are not standard IPv6 followed by transport header either, so also must revert to the software GSO path.
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IPV6_CSUM GSO回退时未正确处理隧道数据包，可能导致隧道数据包校验和错误。
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 a0478d7e888028f85fa7785ea838ce0ca09398e2 ~ 2094a7cf91b71367b649f991aacc7b579f793d0b -
Linux Linux 6.17 -

II. Public POCs for CVE-2026-43057

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III. Intelligence Information for CVE-2026-43057

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Patches & Fixes for CVE-2026-43057 (6)

Same Patch Batch · Linux · 2026-05-01 · 146 CVEs total

CVE-2026-31718 9.8 CRITICAL ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger
CVE-2026-43011 9.8 CRITICAL net/x25: Fix potential double free of skb
CVE-2026-43037 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
CVE-2026-43038 9.8 CRITICAL ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
CVE-2026-43039 9.8 CRITICAL net: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch
CVE-2026-31705 9.8 CRITICAL ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment
CVE-2026-31709 8.8 HIGH smb: client: validate the whole DACL before rewriting it in cifsacl
CVE-2026-31717 8.8 HIGH ksmbd: validate owner of durable handle on reconnect
CVE-2026-43018 8.8 HIGH Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
CVE-2026-31706 8.8 HIGH ksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl()
CVE-2026-43048 8.8 HIGH HID: core: Mitigate potential OOB by removing bogus memset()
CVE-2026-31735 8.8 HIGH iommupt: Fix short gather if the unmap goes into a large mapping
CVE-2026-31739 8.8 HIGH crypto: tegra - Add missing CRYPTO_ALG_ASYNC
CVE-2026-31773 8.8 HIGH Bluetooth: SMP: derive legacy responder STK authentication from MITM state
CVE-2026-31712 8.3 HIGH ksmbd: require minimum ACE size in smb_check_perm_dacl()
CVE-2026-31708 8.1 HIGH smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
CVE-2026-31771 8.1 HIGH Bluetooth: hci_event: move wake reason storage into validated event handlers
CVE-2026-31779 8.1 HIGH wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()
CVE-2026-43051 8.1 HIGH HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq
CVE-2026-31768 7.8 HIGH iio: adc: ti-adc161s626: use DMA-safe memory for spi_read()

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43057

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