CVE-2026-43341
published 2026-05-08CVE-2026-43341: In the Linux kernel, the following vulnerability has been resolved: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6_fill_trace_data()…
PriorityP350critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.41%
33.1th percentile
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.
Affected
66 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 8c6f6fa6772696be0c047a711858084b38763728 < d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2 | d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2 |
| linux | linux | >= 8c6f6fa6772696be0c047a711858084b38763728 < e96d48b37708d53cbdc47f6f60b0714fc4a5f596 | e96d48b37708d53cbdc47f6f60b0714fc4a5f596 |
| linux | linux | >= 8c6f6fa6772696be0c047a711858084b38763728 < d1b041080086e91d3733a5438a8c51ad5d3d8e09 | d1b041080086e91d3733a5438a8c51ad5d3d8e09 |
| linux | linux | >= 8c6f6fa6772696be0c047a711858084b38763728 < 77695a69baca9b99d95fad09fc78c2318736604f | 77695a69baca9b99d95fad09fc78c2318736604f |
| linux | linux | >= 8c6f6fa6772696be0c047a711858084b38763728 < 184d2e9db27c0f76226b5cad16fe29510a5d2280 | 184d2e9db27c0f76226b5cad16fe29510a5d2280 |
| linux | linux | >= 8c6f6fa6772696be0c047a711858084b38763728 < d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d | d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d |
| linux | linux | >= 8c6f6fa6772696be0c047a711858084b38763728 < 5e67ba9bb531e1ec6599a82a065dea9040b9ce50 | 5e67ba9bb531e1ec6599a82a065dea9040b9ce50 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.15 < 6.1.168 | 6.1.168 |
| linux | linux_kernel | >= 6.13 < 6.18.22 | 6.18.22 |
| linux | linux_kernel | >= 6.19 < 6.19.12 | 6.19.12 |
| linux | linux_kernel | >= 6.2 < 6.6.134 | 6.6.134 |
| linux | linux_kernel | >= 6.7 < 6.12.81 | 6.12.81 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-6.8 | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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- InfiniBand drivers;
- IOMMU subsystem;
- Network drivers;
- STMicroelectronics network drivers;
- NVME drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- USB over IP driver;
- File systems infrastructure;
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Summary: Several security issues were fixed in the Linux kernel.
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- ATM drivers;
- RNBD block device driver;
- Ublk userspace block driver;
- Bus devices;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Clocksource drivers;
- CPU idle management framework;
- Hardware crypto device drivers;
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- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
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- Block layer subsystem;
- Cryptographic API;
- DMA engine subsystem;
- InfiniBand drivers;
- STMicroelectronics network drivers;
- Network drivers;
- NVME drivers;
- SCSI subsystem;
- USB over IP driver;
- File systems infrastructure;
- Ext4 file system;
- Network file system (NFS) server daemon;
- SMB network file system;
- Kernel thread helper (kthread);
- IPv6 networking;
- Tracing infrastructure;
- Kernel exit() syscall;
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- Ethernet br
Red Hat
kernel: net/ipv6: ioam6: prevent schema length wraparound in trace fill
vendor_redhat·2026-05-08·CVSS 7.0
CVE-2026-43341 [HIGH] CWE-190 kernel: net/ipv6: ioam6: prevent schema length wraparound in trace fill
kernel: net/ipv6: ioam6: prevent schema length wraparound in trace fill
A flaw was found in the Linux kernel's IPv6 In-situ Operations, Administration, and Maintenance (IOAM6) trace fill functionality. An integer overflow vulnerability exists in the `ioam6_fill_trace_data()` function, where the schema length calculation can wrap around due to being stored in an 8-bit unsigned integer. This bypasses buffer size checks, leading to a buffer overflow that can result in a denial of service or other memory corruption issues.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Ente
VulDB
Linux Kernel up to 6.19.11 ioam6_fill_trace_data buffer overflow (Nessus ID 316948 / WID-SEC-2026-1454)
vuldb·2026-06-19·CVSS 9.8
CVE-2026-43341 [CRITICAL] Linux Kernel up to 6.19.11 ioam6_fill_trace_data buffer overflow (Nessus ID 316948 / WID-SEC-2026-1454)
A vulnerability was found in Linux Kernel up to 6.1.167/6.6.133/6.12.80/6.18.21/6.19.11. It has been declared as critical. Affected is the function ioam6_fill_trace_data. The manipulation results in buffer overflow.
This vulnerability is known as CVE-2026-43341. Access to the local network is required for this attack. No exploit is available.
It is recommended to upgrade the affected component.
GHSA
GHSA-p877-m7m5-3qh3: In the Linux kernel, the following vulnerability has been resolved:
net/ipv6: ioam6: prevent schema length wraparound in trace fill
ioam6_fill_trace
ghsa_unreviewed·2026-05-08
CVE-2026-43341 GHSA-p877-m7m5-3qh3: In the Linux kernel, the following vulnerability has been resolved:
net/ipv6: ioam6: prevent schema length wraparound in trace fill
ioam6_fill_trace
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.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604fhttps://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7dhttps://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596
2026-05-08
Published