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CVE-2026-43035— net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak

AI Predicted 4.4 Difficulty: Easy EPSS 0.13% · P3

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< 903c3405cfcc7700260e456ab66a5867586c9e69affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< 71a3eda7e850ae844cb8993065f4e410c11a46ceaffected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< e35f5195cd44ff4053fbc5d71ea97681728a0099affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< d6db08484c6cb3d4ad696246f9d288eceba2a078affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< 906997ea3766c24fbbf9cc4bf17c047315bbd138affected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< 1091b3c174441a52fdbb92e2fe00338f9371a91caffected
32a4f5ecd7381f30ae3bb36dea77a150ba68af2e< e6e3eb5ee89ac4c163d46429391c889a1bb5e404affected
… +10 more rows
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I. Basic Information for CVE-2026-43035

Vulnerability Information
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Vulnerability Title
net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak When building netlink messages, tc_chain_fill_node() never initializes the tcm_info field of struct tcmsg. Since the allocation is not zeroed, kernel heap memory is leaked to userspace through this 4-byte field. The fix simply zeroes tcm_info alongside the other fields that are already initialized.
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tc_chain_fill_node函数未初始化tcm_info字段，导致内核堆内存信息泄露。
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 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e ~ 903c3405cfcc7700260e456ab66a5867586c9e69 -
LinuxLinux 4.19 -

II. Public POCs for CVE-2026-43035

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III. Intelligence Information for CVE-2026-43035

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Patches & Fixes for CVE-2026-43035 (8)

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

CVE-2026-430119.8 CRITICALnet/x25: Fix potential double free of skb
CVE-2026-430379.8 CRITICALip6_tunnel: clear skb2->cb[] in ip4ip6_err()
CVE-2026-317059.8 CRITICALksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment
CVE-2026-430389.8 CRITICALipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
CVE-2026-430399.8 CRITICALnet: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch
CVE-2026-317189.8 CRITICALksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger
CVE-2026-430188.8 HIGHBluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
CVE-2026-317738.8 HIGHBluetooth: SMP: derive legacy responder STK authentication from MITM state
CVE-2026-317398.8 HIGHcrypto: tegra - Add missing CRYPTO_ALG_ASYNC
CVE-2026-317358.8 HIGHiommupt: Fix short gather if the unmap goes into a large mapping
CVE-2026-317178.8 HIGHksmbd: validate owner of durable handle on reconnect
CVE-2026-430488.8 HIGHHID: core: Mitigate potential OOB by removing bogus memset()
CVE-2026-317098.8 HIGHsmb: client: validate the whole DACL before rewriting it in cifsacl
CVE-2026-317068.8 HIGHksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl()
CVE-2026-317128.3 HIGHksmbd: require minimum ACE size in smb_check_perm_dacl()
CVE-2026-317718.1 HIGHBluetooth: hci_event: move wake reason storage into validated event handlers
CVE-2026-317798.1 HIGHwifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()
CVE-2026-430518.1 HIGHHID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq
CVE-2026-317088.1 HIGHsmb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
CVE-2026-316957.8 HIGHwifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free

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-2026-43035

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