bpf: Reject arena frees below the arena base
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject arena frees below the arena base bpf_arena_free_pages() accepts scalar arena addresses. The runtime masks the address to the low 32 bits and reconstructs a full user address from the arena base before returning the range to the arena free tree. When the scalar value is below the low 32 bits of the arena base, full_uaddr falls below user_vm_start. The existing upper-end clipping then turns this into an out-of-range free-tree offset. A later allocation can reuse that offset and return an address below the arena mapping. Reject such frees before computing the clipped range.
CVE-2026-93045
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93045
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "317460317a02a1af512697e6e964298dedd8a163",
"lessThan": "90453eaf8f14e7be0ab03983f2a93aeb6b990a58",
"versionType": "git"
},
{
"status": "affected",
"version": "317460317a02a1af512697e6e964298dedd8a163",
"lessThan": "a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20",
"versionType": "git"
},
{
"status": "affected",
"version": "317460317a02a1af512697e6e964298dedd8a163",
"lessThan": "8a08635656037aee9c12231ed384449c4ffb1a93",
"versionType": "git"
},
{
"status": "affected",
"version": "317460317a02a1af512697e6e964298dedd8a163",
"lessThan": "b5a71cb2db6d84ac0042549dcec266b18429d41e",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/arena.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/arena.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93045
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #37781 · Revision 1
- Added to Heist Feed
- Publisher date