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CVE-2026-43457— mctp: i2c: fix skb memory leak in receive path

AI Predicted 5.5 Difficulty: Moderate EPSS 0.11% · P2

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinuxf5b8abf9fc3dacd7529d363e26fe8230935d65f8< 0fb2adbdd5c03e8c9ebcdc48afd414b2724c85ebaffected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8< d7900a43b0a314a645ca0a2adf45928dbc7001f4affected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8< 9f81be2ab9d8e4744871bfb3e868ef413413829faffected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8< 1ec54187e1aa40a4cfa2b265e9a311179f24b98daffected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8< 1b1be322342a6b0085bf6ee52235e5ac9834ec25affected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8< e3f5e0f22cfc2371e7471c9fd5b4da78f9df7c69affected
5.18affected
< 5.18unaffected
… +6 more rows
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I. Basic Information for CVE-2026-43457

Vulnerability Information
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Vulnerability Title
mctp: i2c: fix skb memory leak in receive path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mctp: i2c: fix skb memory leak in receive path When 'midev->allow_rx' is false, the newly allocated skb isn't consumed by netif_rx(), it needs to free the skb directly.
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mctp i2c组件在接收路径中当midev->allow_rx为false时未释放新分配的skb，导致skb内存泄漏。
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 f5b8abf9fc3dacd7529d363e26fe8230935d65f8 ~ 0fb2adbdd5c03e8c9ebcdc48afd414b2724c85eb -
LinuxLinux 5.18 -

II. Public POCs for CVE-2026-43457

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III. Intelligence Information for CVE-2026-43457

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Patches & Fixes for CVE-2026-43457 (6)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-433849.8 CRITICALnet/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-433049.8 CRITICALlibceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-433419.8 CRITICALnet/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-433769.8 CRITICALksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-433789.8 CRITICALsmb: server: fix use-after-free in smb2_open()
CVE-2026-434149.8 CRITICALscsi: qla2xxx: Completely fix fcport double free
CVE-2026-434029.8 CRITICALkthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-434659.8 CRITICALnet/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-433799.8 CRITICALksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-433839.4 CRITICALnet/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-434079.1 CRITICALlibceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-434069.1 CRITICALlibceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-433228.8 HIGHBluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-433918.8 HIGHnsfs: tighten permission checks for handle opening
CVE-2026-432848.8 HIGHxfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-434038.8 HIGHnsfs: tighten permission checks for ns iteration ioctls
CVE-2026-433348.8 HIGHBluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-432918.3 HIGHnet: nfc: nci: Fix parameter validation for packet data
CVE-2026-433658.2 HIGHxfs: fix undersized l_iclog_roundoff values
CVE-2026-434528.2 HIGHnetfilter: x_tables: guard option walkers against 1-byte tail reads

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43457

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