UBUNTU-CVE-2026-75804

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Source
https://ubuntu.com/security/CVE-2026-75804
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75804.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-75804
Upstream
Downstream
Related
Published
2026-09-29T00:00:00Z
Modified
2026-10-17T12:56:10Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

Issue summary: OpenSSL QUIC stack does not enforce connection level flow control for streams. Remote peers may send more bytes as long as they fit within the stream flow control limits. Impact summary: A malicious remote peer may exploit the lack of connection flow control for streams to make the QUIC stack receive ~100MB of memory instead of 768 KiB (default flow control window size). CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: The local QUIC stack advertises two flow control limits to its remote peer: stream flow control limit and connection flow control limit. The remote peer must follow both limits when transmitting stream data. Whenever the local QUIC stack receives a stream frame, it validates that the size of the received stream frame stays within flow control limits. If either limit is exceeded (stream level or connection level), then the QUIC stack must close the connection with a flow control error. The vulnerable OpenSSL QUIC stack enforces the stream-level but not the connection-level limit. To exploit the issue, three conditions must be met: - the remote peer opens several streams - each stream must stay within the stream-level flow control limit - there must be no zero-offset byte sent on any of the streams (to prevent the vulnerable QUIC stack from consuming data). By meeting the conditions above, the remote peer may make the local stack allocate 2 x MAX_STREAMS x (stream flow control limit) bytes of memory. MAX_STREAMS defaults to 100, and the limit applies to both bidirectional and unidirectional streams, making it 200 in total. The default flow control window for a stream is 512kB. The remote peer may force the vulnerable QUIC stack to allocate 100MB of heap per connection. FIPS impact: no The FIPS module is not affected as the QUIC implementation is outside of the OpenSSL FIPS module boundary.

References

Affected packages

Ubuntu:26.04:LTS
edk2

Package

Name
edk2
Purl
pkg:deb/ubuntu/edk2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2025.*
2025.02-8ubuntu3
2025.11-3ubuntu6
2025.11-3ubuntu7
2025.11-3ubuntu7.2
2025.11-3ubuntu7.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efi-shell-aa64",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "efi-shell-loongarch64",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "efi-shell-riscv64",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "efi-shell-x64",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "ovmf",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "ovmf-amdsev",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "ovmf-generic",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "ovmf-inteltdx",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "ovmf-legacy",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "qemu-efi-aarch64",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "qemu-efi-loongarch64",
            "binary_version": "2025.11-3ubuntu7.3"
        },
        {
            "binary_name": "qemu-efi-riscv64",
            "binary_version": "2025.11-3ubuntu7.3"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this issue as being low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75804.json"
edk2-hwe

Package

Name
edk2-hwe
Purl
pkg:deb/ubuntu/edk2-hwe?arch=source&distro=resolute

Affected ranges

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

Affected versions

2025.*
2025.11-3ubuntu6
2025.11-3ubuntu8
2025.11-3ubuntu8.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efi-shell-aa64-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "efi-shell-loongarch64-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "efi-shell-riscv64-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "efi-shell-x64-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "ovmf-amdsev-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "ovmf-generic-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "ovmf-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "ovmf-inteltdx-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "ovmf-legacy-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "qemu-efi-aarch64-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "qemu-efi-loongarch64-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        },
        {
            "binary_name": "qemu-efi-riscv64-hwe",
            "binary_version": "2025.11-3ubuntu8.2"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this issue as being low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75804.json"
openssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.5.5-1ubuntu3.6

Affected versions

3.*
3.5.3-1ubuntu2
3.5.5-1ubuntu1
3.5.5-1ubuntu3
3.5.5-1ubuntu3.2
3.5.5-1ubuntu3.3
3.5.5-1ubuntu3.4
3.5.5-1ubuntu3.5

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.5-1ubuntu3.6"
        },
        {
            "binary_name": "openssl",
            "binary_version": "3.5.5-1ubuntu3.6"
        },
        {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.5-1ubuntu3.6"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this issue as being low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75804.json"
Ubuntu:26.10
edk2

Package

Name
edk2
Purl
pkg:deb/ubuntu/edk2?arch=source&distro=stonking

Affected ranges

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

Affected versions

2025.*
2025.11-3ubuntu7
2025.11-3ubuntu8
2026.*
2026.05-2ubuntu1
2026.05-2ubuntu2
2026.05-2ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efi-shell-aa64",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "efi-shell-loongarch64",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "efi-shell-riscv64",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "efi-shell-x64",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-amdsev",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-generic",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-inteltdx",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-legacy",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "qemu-efi-aarch64",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "qemu-efi-loongarch64",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "qemu-efi-riscv64",
            "binary_version": "2026.05-2ubuntu3"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this issue as being low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75804.json"
edk2-hwe

Package

Name
edk2-hwe
Purl
pkg:deb/ubuntu/edk2-hwe?arch=source&distro=stonking

Affected ranges

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

Affected versions

2025.*
2025.11-3ubuntu8
2025.11-3ubuntu9
2026.*
2026.05-2ubuntu1
2026.05-2ubuntu2
2026.05-2ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efi-shell-aa64-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "efi-shell-loongarch64-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "efi-shell-riscv64-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "efi-shell-x64-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-amdsev-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-generic-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-inteltdx-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "ovmf-legacy-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "qemu-efi-aarch64-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "qemu-efi-loongarch64-hwe",
            "binary_version": "2026.05-2ubuntu3"
        },
        {
            "binary_name": "qemu-efi-riscv64-hwe",
            "binary_version": "2026.05-2ubuntu3"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this issue as being low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75804.json"
Ubuntu:Pro:22.04:LTS
nodejs

Package

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

Affected ranges

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

Affected versions

12.*
12.22.5~dfsg-5ubuntu1
12.22.7~dfsg-2ubuntu1
12.22.7~dfsg-2ubuntu3
12.22.9~dfsg-1ubuntu2
12.22.9~dfsg-1ubuntu3
12.22.9~dfsg-1ubuntu3.1
12.22.9~dfsg-1ubuntu3.2
12.22.9~dfsg-1ubuntu3.3
12.22.9~dfsg-1ubuntu3.4
12.22.9~dfsg-1ubuntu3.5
12.22.9~dfsg-1ubuntu3.6
12.22.9~dfsg-1ubuntu3.6+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnode72",
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
        },
        {
            "binary_name": "nodejs",
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this issue as being low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75804.json"