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CVE-2026-43341— net/ipv6: ioam6: prevent schema length wraparound in trace fill

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IPv6 IOAM中ioam6_fill_trace_data函数将模式贡献长度存储在u8变量中，当位22启用且模式负载最大时，sclen从256回绕至0，绕过剩余空间检查导致缓冲区溢出。

CVSS 9.8 · Critical EPSS 0.77% · P55

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 8c6f6fa6772696be0c047a711858084b38763728< d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2 affected
8c6f6fa6772696be0c047a711858084b38763728< e96d48b37708d53cbdc47f6f60b0714fc4a5f596 affected
8c6f6fa6772696be0c047a711858084b38763728< d1b041080086e91d3733a5438a8c51ad5d3d8e09 affected
8c6f6fa6772696be0c047a711858084b38763728< 77695a69baca9b99d95fad09fc78c2318736604f affected
8c6f6fa6772696be0c047a711858084b38763728< 184d2e9db27c0f76226b5cad16fe29510a5d2280 affected
8c6f6fa6772696be0c047a711858084b38763728< d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d affected
8c6f6fa6772696be0c047a711858084b38763728< 5e67ba9bb531e1ec6599a82a065dea9040b9ce50 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-43341

Vulnerability Information
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Vulnerability Title
net/ipv6: ioam6: prevent schema length wraparound in trace fill
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6_fill_trace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the remaining-space check. __ioam6_fill_trace_data() then positions the write cursor without reserving the schema area but still copies the 4-byte schema header and the full schema payload, overrunning the trace buffer. Keep sclen in an unsigned int so the remaining-space check and the write cursor calculation both see the full schema length.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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IPv6 IOAM中ioam6_fill_trace_data函数将模式贡献长度存储在u8变量中，当位22启用且模式负载最大时，sclen从256回绕至0，绕过剩余空间检查导致缓冲区溢出。
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 8c6f6fa6772696be0c047a711858084b38763728 ~ d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-43341

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III. Intelligence Information for CVE-2026-43341

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Patches & Fixes for CVE-2026-43341 (7)

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

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-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
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-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
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-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43334 8.8 HIGH Bluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
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-2026-43452 8.2 HIGH netfilter: x_tables: guard option walkers against 1-byte tail reads
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-2026-43341

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