Linux Kernel up to 6.12.102/6.18.43/7.1.7/7.2-rc5 veth veth_convert_skb_to_xdp_buff buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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9.3$5k-$25k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.12.102/6.18.43/7.1.7/7.2-rc5 and classified as very critical. This affects the function veth_convert_skb_to_xdp_buff of the component veth. The manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-74476. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 6.12.102/6.18.43/7.1.7/7.2-rc5. This issue affects the function veth_convert_skb_to_xdp_buff of the component veth. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: veth: convert frag_list skbs before running XDP A frag_list skb can reach veth with data_len set but nr_frags zero. veth_convert_skb_to_xdp_buff() only converts skbs that are shared, locked, have frags[], or do not have enough headroom. It later uses skb_is_nonlinear() to decide whether to set XDP_FLAGS_HAS_FRAGS and xdp_frags_size. That exposes frag_list data to XDP as if it were stored in frags[], but frags[] is empty. AF_XDP copy mode can then trust the bogus XDP fragment metadata, walk an empty fragment entry, and crash in memcpy() from __xsk_rcv(). Route non-linear skbs through skb_pp_cow_data() before exposing them to XDP, and only advertise XDP frags when the resulting skb has frags[]. skb_copy_bits() already handles frag_list input, and skb_pp_cow_data() builds frags[] output with skb_add_rx_frag(), which is the representation XDP multi-buffer expects.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-74476 since 08/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/23/2026).

Upgrading to version 6.12.103, 6.18.44, 7.1.8 or 7.2-rc6 eliminates this vulnerability. Applying the patch 5c1c15c540fc45820ce3033c319151ec891bc10a/b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb/f9c1fff857e93be709c8b52ed1a643f37bd82c66/d0d6415963040c401e7a7e4e482a698ba52448cb is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.6
VulDB Meta Temp Score: 9.3

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.1
CNA Vector (Linux): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.103/6.18.44/7.1.8/7.2-rc6
Patch: 5c1c15c540fc45820ce3033c319151ec891bc10a/b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb/f9c1fff857e93be709c8b52ed1a643f37bd82c66/d0d6415963040c401e7a7e4e482a698ba52448cb

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
08/15/2026 +0 days VulDB entry created
08/23/2026 +8 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74476 (🔒)
GCVE (CVE): GCVE-0-2026-74476
GCVE (VulDB): GCVE-100-390827

Entryinfo

Created: 08/15/2026 15:28
Updated: 08/23/2026 21:06
Changes: 08/15/2026 15:28 (59), 08/23/2026 21:06 (11)
Complete: 🔍
Cache ID: 216::103

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