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CVE-2026-43452— netfilter: x_tables: guard option walkers against 1-byte tail reads

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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netfilter x_tables中选项遍历器对1字节尾部读取的越界读取问题，可能导致内核崩溃。

CVSS 8.2 · High EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc< c2a445367a496a3c25dbc940c10c8bd1cfd4c14a affected
2e4e6a17af35be359cc8f1c924f8f198fbd478cc< ae1e1267650638136b84c23f2b31250f0ccb6823 affected
2e4e6a17af35be359cc8f1c924f8f198fbd478cc< c39f84e4be1be63fc60ca7141ea7b76edcea5907 affected
2e4e6a17af35be359cc8f1c924f8f198fbd478cc< 9b94f0e42ed248eb31929da84ed9f5310d7ff540 affected
2e4e6a17af35be359cc8f1c924f8f198fbd478cc< 5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c affected
2e4e6a17af35be359cc8f1c924f8f198fbd478cc< bc18551c6169eac5ed813778d3e3e484002dbbe5 affected
2e4e6a17af35be359cc8f1c924f8f198fbd478cc< d04800323336eebf441d153f43234eac9b833d36 affected
2e4e6a17af35be359cc8f1c924f8f198fbd478cc< cfe770220ac2dbd3e104c6b45094037455da81d4 affected
… +10 more rows
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I. Basic Information for CVE-2026-43452

Vulnerability Information
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Vulnerability Title
netfilter: x_tables: guard option walkers against 1-byte tail reads
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: guard option walkers against 1-byte tail reads When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area. Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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netfilter x_tables中选项遍历器对1字节尾部读取的越界读取问题，可能导致内核崩溃。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2e4e6a17af35be359cc8f1c924f8f198fbd478cc ~ c2a445367a496a3c25dbc940c10c8bd1cfd4c14a -
Linux Linux 2.6.16 -

II. Public POCs for CVE-2026-43452

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III. Intelligence Information for CVE-2026-43452

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Patches & Fixes for CVE-2026-43452 (8)

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

CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43334 8.8 HIGH Bluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43291 8.3 HIGH net: nfc: nci: Fix parameter validation for packet data
CVE-2026-43365 8.2 HIGH xfs: fix undersized l_iclog_roundoff values
CVE-2026-43466 8.2 HIGH net/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-2026-43452

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