CVE-2022-49964
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-49964
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49964.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-49964
- Downstream
- Related
- Published
- 2025-06-18T11:00:29Z
- Modified
- 2025-10-21T11:25:30.831057Z
- Summary
- arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level
Though acpifindlastcachelevel() always returned signed value and the document states it will return any errors caused by lack of a PPTT table, it never returned negative values before.
Commit 0c80f9e165f8 ("ACPI: PPTT: Leave the table mapped for the runtime usage") however changed it by returning -ENOENT if no PPTT was found. The value returned from acpifindlastcachelevel() is then assigned to unsigned fw_level.
It will result in the number of cache leaves calculated incorrectly as a huge value which will then cause the following warning from _allocpages as the order would be great than MAX_ORDER because of incorrect and huge cache leaves value.
| WARNING: CPU: 0 PID: 1 at mm/pagealloc.c:5407 _allocpages+0x74/0x314 | Modules linked in: | CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-10393-g7c2a8d3ac4c0 #73 | pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) | pc : _allocpages+0x74/0x314 | lr : allocpages+0xe8/0x318 | Call trace: | _allocpages+0x74/0x314 | allocpages+0xe8/0x318 | kmallocordertrace+0x68/0x1dc | _kmalloc+0x240/0x338 | detectcacheattributes+0xe0/0x56c | updatesiblingsmasks+0x38/0x284 | storecputopology+0x78/0x84 | smppreparecpus+0x48/0x134 | kernelinitfreeable+0xc4/0x14c | kernelinit+0x2c/0x1b4 | retfrom_fork+0x10/0x20
Fix the same by changing fwlevel to be signed integer and return the error from initcache_level() early in case of error.
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf03d253ba71994b196f342a7acad448a56812a8cFixeda754ee1c66bd0a23e613f0bf865053b29cb90e16
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0c80f9e165f8f9cca743d7b6cbdb54362da297e0Fixede75d18cecbb3805895d8ed64da4f78575ec96043
Affected versions
v5.*
v6.*
Database specific
vanir_signatures
[
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@e75d18cecbb3805895d8ed64da4f78575ec96043",
"target": {
"function": "init_cache_level",
"file": "arch/arm64/kernel/cacheinfo.c"
},
"signature_type": "Function",
"deprecated": false,
"signature_version": "v1",
"id": "CVE-2022-49964-2e289898",
"digest": {
"function_hash": "112244431300453041858121010981964954845",
"length": 507.0
}
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a754ee1c66bd0a23e613f0bf865053b29cb90e16",
"target": {
"file": "arch/arm64/kernel/cacheinfo.c"
},
"signature_type": "Line",
"deprecated": false,
"signature_version": "v1",
"id": "CVE-2022-49964-8b7d0181",
"digest": {
"line_hashes": [
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"threshold": 0.9
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},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@e75d18cecbb3805895d8ed64da4f78575ec96043",
"target": {
"file": "arch/arm64/kernel/cacheinfo.c"
},
"signature_type": "Line",
"deprecated": false,
"signature_version": "v1",
"id": "CVE-2022-49964-cd7d7b78",
"digest": {
"line_hashes": [
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"threshold": 0.9
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},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a754ee1c66bd0a23e613f0bf865053b29cb90e16",
"target": {
"function": "init_cache_level",
"file": "arch/arm64/kernel/cacheinfo.c"
},
"signature_type": "Function",
"deprecated": false,
"signature_version": "v1",
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"digest": {
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]