UBUNTU-CVE-2026-72897

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Source
https://ubuntu.com/security/CVE-2026-72897
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-72897.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-72897
Upstream
Downstream
Related
Published
2026-09-29T00:00:00Z
Modified
2026-10-17T13:00:58Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

Issue summary: A TLS server that calls SSL_set_SSL_CTX() to switch a connection to a different SSL_CTX part way through a handshake may access memory beyond the end of an internal array if the replacement context knows about more provider signature algorithms than the context the connection was created from. Applications which never call SSL_set_SSL_CTX() are not affected. Impact summary: A remote peer may be able to cause a small out-of-bounds read, and in some circumstances a fixed-value out-of-bounds write, on the server heap. This may lead to a Denial of Service. CWE: CWE-787: Out-of-bounds Write Description: A TLS connection records how many certificate slots it has when it is created, taken from the SSL_CTX that created it: the built-in certificate types plus one slot for each provider TLS-SIGALG entry that context was aware of. That count sizes an internal array of per-slot certificate validity flags. An application may replace a connection's SSL_CTX part way through the handshake by calling SSL_set_SSL_CTX(), most commonly from a servername callback in order to serve a different virtual host. Doing so did not refresh the recorded count. A provider signature algorithm's slot index is its position in the list of whichever context resolves it, so if the replacement context is aware of more of them than the original, an algorithm offered by the peer can resolve to an index beyond the end of the array. Processing the peer's signature algorithms then reads one four byte word past the end for each such algorithm and, where the word read is zero, writes a fixed value over it. A peer offering many of them can corrupt heap metadata and abort the process. Only provider signature algorithms which occupy one of the excess slots, and which the server also has configured, have this effect. Codepoints the replacement context does not recognise are discarded without being resolved to a slot, and provider signature algorithms are usable only from TLS 1.3. The two contexts must therefore be aware of different numbers of provider signature algorithms, which requires separate library contexts, a provider loaded between the two being created, or providers which differ in what they advertise - in 4.0, for example, the default provider advertises SM2 where the FIPS provider does not. A deployment meeting the condition is also unable to negotiate the affected algorithms with legitimate clients, since the same stale count hides the corresponding certificates, so the misconfiguration is likely to be noticed. For that reason, and because the configuration is not the default, this issue has been assessed as Low severity. FIPS impact: no No FIPS modules are affected by this issue as the affected code is outside 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-2026-72897.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-2026-72897.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-2026-72897.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-2026-72897.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-2026-72897.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-2026-72897.json"