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CVE-2026-43383— net/tcp-md5: Fix MAC comparison to be constant-time

CVSS 9.4 · Critical EPSS 0.44% · P36

Possible ATT&CK Techniques 1AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxcfb6eeb4c860592edd123fdea908d23c6ad1c7dc< 821c8751fdeecdeecabeb11704dd33439c9e4bbcaffected
cfb6eeb4c860592edd123fdea908d23c6ad1c7dc< ff44ec94d4fc8348600a69de0a8fa1102c23bce8affected
cfb6eeb4c860592edd123fdea908d23c6ad1c7dc< 345a9530756528d7ca407663d659c3c40e75c3ddaffected
cfb6eeb4c860592edd123fdea908d23c6ad1c7dc< 5d305a95130a8d08b9545e47f1e18d29d59866cbaffected
cfb6eeb4c860592edd123fdea908d23c6ad1c7dc< 02669e2a4d207068edce7e8b5fafd85822018ce6affected
cfb6eeb4c860592edd123fdea908d23c6ad1c7dc< ae3831b44f477de048287493e184fc3ff913b624affected
cfb6eeb4c860592edd123fdea908d23c6ad1c7dc< b502e97e29d791ff7a8051f29a414535739be218affected
cfb6eeb4c860592edd123fdea908d23c6ad1c7dc< 46d0d6f50dab706637f4c18a470aac20a21900d3affected
… +10 more rows
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I. Basic Information for CVE-2026-43383

Vulnerability Information
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Vulnerability Title
net/tcp-md5: Fix MAC comparison to be constant-time
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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tcp-md5的MAC比较未使用恒定时间，可能导致时序攻击。
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 cfb6eeb4c860592edd123fdea908d23c6ad1c7dc ~ 821c8751fdeecdeecabeb11704dd33439c9e4bbc -
LinuxLinux 2.6.20 -

II. Public POCs for CVE-2026-43383

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III. Intelligence Information for CVE-2026-43383

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Patches & Fixes for CVE-2026-43383 (8)

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-2026-433799.8 CRITICALksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-433789.8 CRITICALsmb: server: fix use-after-free in smb2_open()
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-2026-434149.8 CRITICALscsi: qla2xxx: Completely fix fcport double free
CVE-2026-434659.8 CRITICALnet/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-433049.8 CRITICALlibceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-434029.8 CRITICALkthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-434069.1 CRITICALlibceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-434079.1 CRITICALlibceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-433918.8 HIGHnsfs: tighten permission checks for handle opening
CVE-2026-433348.8 HIGHBluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-433228.8 HIGHBluetooth: hci_sync: Fix UAF in le_read_features_complete
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-2026-432918.3 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
CVE-2026-434668.2 HIGHnet/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery

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-2026-43383

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