params: fix charp corruption on allocation failure
In the Linux kernel, the following vulnerability has been resolved: params: fix charp corruption on allocation failure param_set_charp() stores charp parameters in allocated memory after slab is available, and releases the previous value when the parameter is updated. The previous value is released before the replacement allocation succeeds. If kmalloc_parameter() fails, the setter returns -ENOMEM with the parameter left as NULL. Failing zswap's compressor update before zswap is initialized can later trigger: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:strcmp+0x10/0x30 Call Trace: zswap_setup+0x3b1/0x490 zswap_enabled_param_set+0x5b/0xa0 param_attr_store+0x93/0xe0 module_attr_store+0x1c/0x30 kernfs_fop_write_iter+0x116/0x1f0 Allocate and copy the replacement first, then replace the parameter value only after allocation succeeds.
CVE-2026-89552
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-2026-89552
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": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a",
"lessThan": "31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1",
"versionType": "git"
},
{
"status": "affected",
"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a",
"lessThan": "614f873268c5b172804c9af6639bd17b7e1e2359",
"versionType": "git"
},
{
"status": "affected",
"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a",
"lessThan": "704ecd010d4a9b33160e40b74eb402f6b86a18e0",
"versionType": "git"
},
{
"status": "affected",
"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a",
"lessThan": "0d8e2404925a0607ffec79a53170715a46936896",
"versionType": "git"
},
{
"status": "affected",
"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a",
"lessThan": "3dfaae04243cde460d82dfc2a7dd0bb6664d20ae",
"versionType": "git"
}
],
"programFiles": [
"kernel/params.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.30",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/params.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89552
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46678 · Revision 1
- Added to Heist Feed
- Publisher date