In the Linux kernel, the following vulnerability has been resolved: libceph: Fix slab-out-of-bounds access in auth message processing If a… (CVE-2026-46119)
A high severity vulnerability (CVE-2026-46119) in the Linux kernel's libceph component was fixed. The flaw involved a slab-out-of-bounds access during authentication message processing, where a positive result value was incorrectly treated as an error size, leading to out-of-bounds memory access and potential leakage of memory content. The issue was resolved by correcting the interpretation of the result field and adding additional checks. This vulnerability affects numerous Linux kernel versions prior to the fixed releases. A patch is available and should be applied to mitigate the risk.
AI Analysis
Technical Summary
CVE-2026-46119 is a vulnerability in the Linux kernel's libceph module where a slab-out-of-bounds access occurs during processing of CEPH_MSG_AUTH_REPLY messages. If a message contains a positive value in its result field, it was mistakenly treated as an error code, causing the system to send a preallocated message with the result value interpreted as the size of the front segment to send. If this value exceeds the allocated buffer size, an out-of-bounds memory access happens, potentially leaking memory content. The patch fixes this by treating only negative values as errors and adding a BUG_ON check to prevent invalid lengths.
Potential Impact
The vulnerability allows out-of-bounds memory access in the kernel space, which can lead to leakage of sensitive memory content and cause denial of service due to memory corruption. The CVSS score of 9.1 indicates a critical impact with network attack vector, low complexity, no privileges required, no user interaction, and high confidentiality and availability impact. This could allow remote attackers to obtain sensitive information or disrupt system availability.
Mitigation Recommendations
A patch is available and should be applied promptly. The vendor advisory from Ubuntu confirms that the issue is fixed in updated Linux kernel packages. Users should update their Linux kernel to the fixed versions listed in the advisory and reboot the system to apply the changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation steps are indicated beyond applying the official fix.
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix slab-out-of-bounds access in auth message processing If a… (CVE-2026-46119)
Description
A high severity vulnerability (CVE-2026-46119) in the Linux kernel's libceph component was fixed. The flaw involved a slab-out-of-bounds access during authentication message processing, where a positive result value was incorrectly treated as an error size, leading to out-of-bounds memory access and potential leakage of memory content. The issue was resolved by correcting the interpretation of the result field and adding additional checks. This vulnerability affects numerous Linux kernel versions prior to the fixed releases. A patch is available and should be applied to mitigate the risk.
CVSS v3.1
Score 9.1critical
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=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-46119 is a vulnerability in the Linux kernel's libceph module where a slab-out-of-bounds access occurs during processing of CEPH_MSG_AUTH_REPLY messages. If a message contains a positive value in its result field, it was mistakenly treated as an error code, causing the system to send a preallocated message with the result value interpreted as the size of the front segment to send. If this value exceeds the allocated buffer size, an out-of-bounds memory access happens, potentially leaking memory content. The patch fixes this by treating only negative values as errors and adding a BUG_ON check to prevent invalid lengths.
Potential Impact
The vulnerability allows out-of-bounds memory access in the kernel space, which can lead to leakage of sensitive memory content and cause denial of service due to memory corruption. The CVSS score of 9.1 indicates a critical impact with network attack vector, low complexity, no privileges required, no user interaction, and high confidentiality and availability impact. This could allow remote attackers to obtain sensitive information or disrupt system availability.
Mitigation Recommendations
A patch is available and should be applied promptly. The vendor advisory from Ubuntu confirms that the issue is fixed in updated Linux kernel packages. Users should update their Linux kernel to the fixed versions listed in the advisory and reboot the system to apply the changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation steps are indicated beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46119
- Osv Schema Version
- 1.7.0
- 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"]
- Cvss Version
- 4.0
Threat ID: 6a58b4a568715ace43da9114
Added to database: 07/16/2026, 10:38:29 UTC
Last enriched: 09/08/2026, 00:49:39 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 27
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