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CVE-2026-43083
critical
CVSS 9.1
Vulnerability in linux (CVE-2026-43083)
Summary
vulnerability in linux (CVE-2026-43083). Confidential information can be exposed externally.
AI summary openai / gpt-4o
A vulnerability has been discovered in the Linux kernel that allows out-of-bounds memory access via network attacks. This can lead to system instability or service disruption. Instruct your IT team to check if your systems are affected and update to the recommended version. Prompt action is crucial to address such issues.
In the Linux kernel's ioam6 module, an out-of-bounds access can occur under specific conditions when trace->type.bit6 is set. The issue manifests when is_input is true, resulting in skb->queue_mapping exceeding the device's TX queue count. The resolution involved adding boundary checks in the skb_get_tx_queue() usage. Additionally, a missing lock around qdisc_qstats_qlen_backlog() led to the inclusion of spin_lock_bh(). The patch is applied in the latest commits of the Linux kernel repository.
❓ What is the problem
Out-of-bounds access in Linux kernel's ioam6 module
📍 Affected scope
ioam6.c in Linux kernel
🔥 Severity
Critical, CVSS 9.1
🔧 How to fix
Apply latest patches from the Linux kernel repository
🛡️ Workaround
Material did not specify any workarounds
🔍 Detection
Monitor for unusual kernel message logs or network traffic anomalies related to RX and TX queue mismatches
Related past incidents Similar incidents extracted from past CVEs
A Bluetooth vulnerability in the Linux kernel that allowed remote code execution due to malformed input leading to out-of-bounds access
A heap out-of-bounds write vulnerability in the Linux kernel's netfilter that allowed escalation via crafted network packets
An out-of-bounds write in the ioam6 module of Linux kernel prior to 5.18.13
If this happens at your company Expected impact per business scenario
📌 In an enterprise network environment
Can lead to system crashes or downtime impacting business operations and productivity.
📌 On cloud-based Linux systems
Services may become unavailable, affecting customers and revenue due to downtime.
📌 Embedded Linux systems in critical infrastructure
Could result in significant disruptions, compromising safety and operational continuity.
Recommended action
Update all affected systems to the latest Linux kernel version that includes the patch, and monitor for unusual network activity or kernel log messages related to this vulnerability.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.依存マニフェストで影響コンポーネントを特定する。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- web https://git.kernel.org/stable/c/6d1d9ed9b409e0662241e3d245d574a18f643494
- web https://git.kernel.org/stable/c/95a1334748c95dd15546056280ade0c4b8dd7b78
- web https://git.kernel.org/stable/c/b30b1675aa2bcf0491fd3830b051df4e08a7c8ca
- web https://nvd.nist.gov/vuln/detail/CVE-2026-43083
- web https://github.com/advisories/GHSA-29pf-hv9p-f96v