CVE-2026-43464 Vulnerability Analysis & Exploit Details

CVE-2026-43464
Vulnerability Scoring

7.5
/10
Very High Risk

Highly exploitable, CVE-2026-43464 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-43464 Details

Status: Analyzed

Last updated: 🕡 20 May 2026, 18:39 UTC
Originally published on: 🕒 08 May 2026, 15:16 UTC

Time between publication and last update: 12 days

CVSS Release: version 3

CVSS3 Source

416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE-2026-43464 Vulnerability Summary

CVE-2026-43464: In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: RX, Fix XDP multi-buf frag counting for legacy RQ XDP multi-buf programs can modify the layout of the XDP buffer when the program calls bpf_xdp_pull_data() or bpf_xdp_adjust_tail(). The referenced commit in the fixes tag corrected the assumption in the mlx5 driver that the XDP buffer layout doesn't change during a program execution. However, this fix introduced another issue: the dropped fragments still need to be counted on the driver side to avoid page fragment reference counting issues. Such issue can be observed with the test_xdp_native_adjst_tail_shrnk_data selftest when using a payload of 3600 and shrinking by 256 bytes (an upcoming selftest patch): the last fragment gets released by the XDP code but doesn't get tracked by the driver. This results in a negative pp_ref_count during page release and the following splat: WARNING: include/net/page_pool/helpers.h:297 at mlx5e_page_release_fragmented.isra.0+0x4a/0x50 [mlx5_core], CPU#12: ip/3137 Modules linked in: [...] CPU: 12 UID: 0 PID: 3137 Comm: ip Not tainted 6.19.0-rc3+ #12 NONE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 RIP: 0010:mlx5e_page_release_fragmented.isra.0+0x4a/0x50 [mlx5_core] [...] Call Trace: <TASK> mlx5e_dealloc_rx_wqe+0xcb/0x1a0 [mlx5_core] mlx5e_free_rx_descs+0x7f/0x110 [mlx5_core] mlx5e_close_rq+0x50/0x60 [mlx5_core] mlx5e_close_queues+0x36/0x2c0 [mlx5_core] mlx5e_close_channel+0x1c/0x50 [mlx5_core] mlx5e_close_channels+0x45/0x80 [mlx5_core] mlx5e_safe_switch_params+0x1a5/0x230 [mlx5_core] mlx5e_change_mtu+0xf3/0x2f0 [mlx5_core] netif_set_mtu_ext+0xf1/0x230 do_setlink.isra.0+0x219/0x1180 rtnl_newlink+0x79f/0xb60 rtnetlink_rcv_msg+0x213/0x3a0 netlink_rcv_skb+0x48/0xf0 netlink_unicast+0x24a/0x350 netlink_sendmsg+0x1ee/0x410 __sock_sendmsg+0x38/0x60 ____sys_sendmsg+0x232/0x280 ___sys_sendmsg+0x78/0xb0 __sys_sendmsg+0x5f/0xb0 [...] do_syscall_64+0x57/0xc50 This patch fixes the issue by doing page frag counting on all the original XDP buffer fragments for all relevant XDP actions (XDP_TX , XDP_REDIRECT and XDP_PASS). This is basically reverting to the original counting before the commit in the fixes tag. As frag_page is still pointing to the original tail, the nr_frags parameter to xdp_update_skb_frags_info() needs to be calculated in a different way to reflect the new nr_frags.

Assessing the Risk of CVE-2026-43464

Access Complexity Graph

The exploitability of CVE-2026-43464 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-43464

With low attack complexity and no required privileges, CVE-2026-43464 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-43464, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-43464, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-43464 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2026-43464 poses no threat to data integrity.
  • Availability: High
    CVE-2026-43464 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-43464 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:6.6.115:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.115:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.116:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.117:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.117:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.118:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.118:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.119:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.119:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.120:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.120:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.121:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.122:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.123:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.124:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.125:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.127:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.128:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.129:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.131:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.134:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.135:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.136:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.137:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.6.138:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.56:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.57:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.58:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.59:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.60:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.61:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.62:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.63:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.64:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.65:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.66:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.70:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.72:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.74:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.77:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.78:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.80:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.81:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.82:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.83:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.84:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12.87:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12:rc6:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.12:rc7:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.6:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.7:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.8:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.9:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.11:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.12:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17.13:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.18.1:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
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    cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2026-43464: Combat Critical CVE Threats

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