UBUNTU-CVE-2026-8798

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Source
https://ubuntu.com/security/CVE-2026-8798
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8798.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-8798
Upstream
  • CVE-2026-8798
Published
2026-08-08T01:16:00Z
Modified
2026-08-13T00:02:12Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

In Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.1.3, the native entropy source used on Intel platforms retried the CPU entropy instructions without any bound. RDSEED and RDRAND report failure through their carry flag, and the JNI seeding routine spun re-issuing the instruction for as long as that flag stayed clear, so a persistent failure of the on-chip entropy source - whether from a hardware fault, from the underlying DRBG being exhausted by contention across many cores, or from a hypervisor that does not provide the instruction - left the calling thread looping indefinitely inside the JNI call, where it could be neither interrupted nor timed out. Any operation drawing from the native entropy source could therefore hang, denying service to the application. The retry loops are now bounded (200 attempts for RDSEED and 20 for RDRAND, twice the baselines given in Intel's Digital Random Number Generator software implementation guide), pausing between attempts and, on exhaustion, clearing any partially written buffer and throwing rather than continuing to spin. The clear is performed by an un-elidable memzero, which uses a volatile pointer and an assembly memory barrier so that a compiler cannot optimise the erase away as a dead store. Bouncy Castle for Java (bcprov) is not affected, as it has no native entropy source; the 1.0.X and 2.0.X FIPS series are not affected.

References

Affected packages

Ubuntu:26.04:LTS
bouncycastle

Package

Name
bouncycastle
Purl
pkg:deb/ubuntu/bouncycastle?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.80-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.80-3",
            "binary_name": "libbcjmail-java"
        },
        {
            "binary_version": "1.80-3",
            "binary_name": "libbcmail-java"
        },
        {
            "binary_version": "1.80-3",
            "binary_name": "libbcpg-java"
        },
        {
            "binary_version": "1.80-3",
            "binary_name": "libbcpkix-java"
        },
        {
            "binary_version": "1.80-3",
            "binary_name": "libbcprov-java"
        },
        {
            "binary_version": "1.80-3",
            "binary_name": "libbctls-java"
        },
        {
            "binary_version": "1.80-3",
            "binary_name": "libbcutil-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8798.json"
Ubuntu:Pro:16.04:LTS
bouncycastle

Package

Name
bouncycastle
Purl
pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.49+dfsg-3ubuntu1
1.51-4ubuntu1
1.51-4ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.51-4ubuntu1+esm1",
            "binary_name": "libbcmail-java"
        },
        {
            "binary_version": "1.51-4ubuntu1+esm1",
            "binary_name": "libbcpg-java"
        },
        {
            "binary_version": "1.51-4ubuntu1+esm1",
            "binary_name": "libbcpkix-java"
        },
        {
            "binary_version": "1.51-4ubuntu1+esm1",
            "binary_name": "libbcprov-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8798.json"
Ubuntu:Pro:18.04:LTS
bouncycastle

Package

Name
bouncycastle
Purl
pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.57-1
1.58-1
1.59-1
1.59-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.59-1ubuntu0.1~esm1",
            "binary_name": "libbcmail-java"
        },
        {
            "binary_version": "1.59-1ubuntu0.1~esm1",
            "binary_name": "libbcpg-java"
        },
        {
            "binary_version": "1.59-1ubuntu0.1~esm1",
            "binary_name": "libbcpkix-java"
        },
        {
            "binary_version": "1.59-1ubuntu0.1~esm1",
            "binary_name": "libbcprov-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8798.json"
Ubuntu:Pro:20.04:LTS
bouncycastle

Package

Name
bouncycastle
Purl
pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.61-1
1.61-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.61-1ubuntu0.1~esm1",
            "binary_name": "libbcmail-java"
        },
        {
            "binary_version": "1.61-1ubuntu0.1~esm1",
            "binary_name": "libbcpg-java"
        },
        {
            "binary_version": "1.61-1ubuntu0.1~esm1",
            "binary_name": "libbcpkix-java"
        },
        {
            "binary_version": "1.61-1ubuntu0.1~esm1",
            "binary_name": "libbcprov-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8798.json"
Ubuntu:Pro:22.04:LTS
bouncycastle

Package

Name
bouncycastle
Purl
pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.68-2
1.68-4
1.68-5
1.68-5ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.68-5ubuntu0.1~esm1",
            "binary_name": "libbcmail-java"
        },
        {
            "binary_version": "1.68-5ubuntu0.1~esm1",
            "binary_name": "libbcpg-java"
        },
        {
            "binary_version": "1.68-5ubuntu0.1~esm1",
            "binary_name": "libbcpkix-java"
        },
        {
            "binary_version": "1.68-5ubuntu0.1~esm1",
            "binary_name": "libbcprov-java"
        },
        {
            "binary_version": "1.68-5ubuntu0.1~esm1",
            "binary_name": "libbctls-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8798.json"
Ubuntu:Pro:24.04:LTS
bouncycastle

Package

Name
bouncycastle
Purl
pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.72-2
1.77-1
1.77-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.77-1ubuntu0.1~esm1",
            "binary_name": "libbcjmail-java"
        },
        {
            "binary_version": "1.77-1ubuntu0.1~esm1",
            "binary_name": "libbcmail-java"
        },
        {
            "binary_version": "1.77-1ubuntu0.1~esm1",
            "binary_name": "libbcpg-java"
        },
        {
            "binary_version": "1.77-1ubuntu0.1~esm1",
            "binary_name": "libbcpkix-java"
        },
        {
            "binary_version": "1.77-1ubuntu0.1~esm1",
            "binary_name": "libbcprov-java"
        },
        {
            "binary_version": "1.77-1ubuntu0.1~esm1",
            "binary_name": "libbctls-java"
        },
        {
            "binary_version": "1.77-1ubuntu0.1~esm1",
            "binary_name": "libbcutil-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8798.json"