UBUNTU-CVE-2026-90648

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Source
https://ubuntu.com/security/CVE-2026-90648
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90648.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-90648
Upstream
Published
2026-09-14T00:00:00Z
Modified
2026-09-14T11:17:47Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

wasm2c in WebAssembly wabt through 1.0.41 allows sandbox escape in some situations that primarily involve 32-bit platforms, aka a "table flip" attack. It does not check the return value of calloc() in wasm_rt_allocate_funcref_table() (wasm2c/wasm-rt-impl-tableops.inc). When the funcref table allocation fails, table->data is left NULL while table->size keeps the guest-declared element count; thus, bounds checks still pass and table element accesses resolve to absolute memory addresses (i * sizeof(wasm_rt_funcref_t)). This gives arbitrary read and write of host process memory and - via table.get, table.set, and call_indirect - arbitrary code execution, defeating the isolation that wasm2c exists to provide (a full sandbox escape). wasm2c is used as an in-process sandboxing boundary by RLBox and WasmBoxC, including in Firefox, which compiles the Graphite, Hunspell, Ogg, Expat, and Woff2 libraries via wasm2c to contain untrusted font, media, and XML input. Therefore, sandboxing in these applications is potentially affected. Exploitation requires the funcref table allocation to fail, for example under an address-space limit (RLIMIT_AS), on 32-bit hosts, with vm.overcommit_memory=2, or under memory pressure. On 64-bit Linux with default overcommit the allocation succeeds and the defect is not triggered. The wasm2c memory allocator aborts on calloc failure in the same runtime; the table allocator lacks this abort behavior. This was introduced in commit ab9e0b55 (PR #813).

References

Affected packages

Ubuntu:20.04:LTS / wabt

Package

Name
wabt
Purl
pkg:deb/ubuntu/wabt?arch=source&distro=focal

Affected ranges

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

Affected versions

1.*
1.0.11-1
1.0.12-1
1.0.13-1
1.0.13-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wabt",
            "binary_version": "1.0.13-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90648.json"

Ubuntu:22.04:LTS / wabt

Package

Name
wabt
Purl
pkg:deb/ubuntu/wabt?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.0.20-1
1.0.24-1
1.0.24-2
1.0.25-1
1.0.26-1
1.0.27-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wabt",
            "binary_version": "1.0.27-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90648.json"

Ubuntu:24.04:LTS / wabt

Package

Name
wabt
Purl
pkg:deb/ubuntu/wabt?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.0.33-1
1.0.34-1
1.0.34+dsfg2+~cs1.0.32-1ubuntu1
1.0.34+dsfg2+~cs1.0.32-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wabt",
            "binary_version": "1.0.34+dsfg2+~cs1.0.32-1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90648.json"

Ubuntu:26.04:LTS / wabt

Package

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

Affected ranges

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

Affected versions

1.*
1.0.36+dfsg+~cs1.0.36-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "wabt",
            "binary_version": "1.0.36+dfsg+~cs1.0.36-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90648.json"