CVE-2026-89552

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896
https://git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae
https://git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359
https://git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-11 20:19

NVD link : CVE-2026-89552

Mitre link : CVE-2026-89552

CVE.ORG link : CVE-2026-89552

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-89552", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"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": "6.12.109", "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-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/params.c"], "defaultStatus": "affected"}]}], "published": "2026-09-11T20:19:38.760", "references": [{"url": "https://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparams: fix charp corruption on allocation failure\n\nparam_set_charp() stores charp parameters in allocated memory after slab is\navailable, and releases the previous value when the parameter is updated.\n\nThe previous value is released before the replacement allocation succeeds.\nIf kmalloc_parameter() fails, the setter returns -ENOMEM with the parameter\nleft as NULL.\n\nFailing zswap's compressor update before zswap is initialized can later\ntrigger:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n RIP: 0010:strcmp+0x10/0x30\n Call Trace:\n zswap_setup+0x3b1/0x490\n zswap_enabled_param_set+0x5b/0xa0\n param_attr_store+0x93/0xe0\n module_attr_store+0x1c/0x30\n kernfs_fop_write_iter+0x116/0x1f0\n\nAllocate and copy the replacement first, then replace the parameter value\nonly after allocation succeeds."}], "lastModified": "2026-09-11T20:19:38.760", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}