Linux aws: In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible UAF in icmpv6_rcv() Caching saddr and daddr before… (CVE-2026-53006)
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible UAF in icmpv6_rcv() Caching saddr and daddr before pskb_pull() is problematic since skb->head can change. Remove these temporary variables: - We only access &ipv6_hdr(skb)->saddr and &ipv6_hdr(skb)->daddr when net_dbg_ratelimited() is called in the slow path. - Avoid potential future misuse after pskb_pull() call.
AI Analysis
Technical Summary
This vulnerability in the Linux kernel's IPv6 stack involves a possible use-after-free condition in the icmpv6_rcv() function. The root cause is caching the source and destination IPv6 addresses before the pskb_pull() call, which is problematic because skb->head can change during this operation. The fix removes these temporary cached variables and accesses the addresses only when net_dbg_ratelimited() is called in the slow path, thereby avoiding potential invalid memory access and future misuse after pskb_pull().
Potential Impact
Exploitation of this vulnerability could lead to use-after-free conditions in the kernel, potentially causing system instability or allowing an attacker to execute arbitrary code with kernel privileges. The CVSS vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on availability, suggesting a high severity risk if exploited.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should update affected Linux kernel versions to these or newer patched releases to remediate the vulnerability. Since this is not a cloud service, manual patching is required. No vendor advisory content contradicts this; therefore, applying the official kernel updates is the recommended mitigation.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible UAF in icmpv6_rcv() Caching saddr and daddr before… (CVE-2026-53006)
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible UAF in icmpv6_rcv() Caching saddr and daddr before pskb_pull() is problematic since skb->head can change. Remove these temporary variables: - We only access &ipv6_hdr(skb)->saddr and &ipv6_hdr(skb)->daddr when net_dbg_ratelimited() is called in the slow path. - Avoid potential future misuse after pskb_pull() call.
CVSS v3.1
Score 9.8critical
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in the Linux kernel's IPv6 stack involves a possible use-after-free condition in the icmpv6_rcv() function. The root cause is caching the source and destination IPv6 addresses before the pskb_pull() call, which is problematic because skb->head can change during this operation. The fix removes these temporary cached variables and accesses the addresses only when net_dbg_ratelimited() is called in the slow path, thereby avoiding potential invalid memory access and future misuse after pskb_pull().
Potential Impact
Exploitation of this vulnerability could lead to use-after-free conditions in the kernel, potentially causing system instability or allowing an attacker to execute arbitrary code with kernel privileges. The CVSS vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on availability, suggesting a high severity risk if exploited.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should update affected Linux kernel versions to these or newer patched releases to remediate the vulnerability. Since this is not a cloud service, manual patching is required. No vendor advisory content contradicts this; therefore, applying the official kernel updates is the recommended mitigation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53006
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a5a015891ae9bcd3f8025f9
Added to database: 07/17/2026, 10:18:00 UTC
Last enriched: 07/30/2026, 20:38:13 UTC
Last updated: 07/31/2026, 21:28:57 UTC
Views: 3
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