CVE-2026-89552

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89552", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.723Z", "datePublished": "2026-09-11T19:44:26.091Z", "dateUpdated": "2026-10-30T12:32:11.008Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:11.008Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/params.c"], "versions": [{"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "72835d539ed3eb4c4b85b85a3f3976c7bdc70b91", "status": "affected", "versionType": "git"}, {"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f", "status": "affected", "versionType": "git"}, {"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "32c1f305cfad192cd98468140beedeffe4792f53", "status": "affected", "versionType": "git"}, {"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1", "status": "affected", "versionType": "git"}, {"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "614f873268c5b172804c9af6639bd17b7e1e2359", "status": "affected", "versionType": "git"}, {"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "704ecd010d4a9b33160e40b74eb402f6b86a18e0", "status": "affected", "versionType": "git"}, {"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "0d8e2404925a0607ffec79a53170715a46936896", "status": "affected", "versionType": "git"}, {"version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "lessThan": "3dfaae04243cde460d82dfc2a7dd0bb6664d20ae", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/params.c"], "versions": [{"version": "2.6.30", "status": "affected"}, {"version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/72835d539ed3eb4c4b85b85a3f3976c7bdc70b91"}, {"url": "https://git.kernel.org/stable/c/c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f"}, {"url": "https://git.kernel.org/stable/c/32c1f305cfad192cd98468140beedeffe4792f53"}, {"url": "https://git.kernel.org/stable/c/31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1"}, {"url": "https://git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359"}, {"url": "https://git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0"}, {"url": "https://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896"}, {"url": "https://git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae"}], "title": "params: fix charp corruption on allocation failure", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/params.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "72835d539ed3eb4c4b85b85a3f3976c7bdc70b91", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}, {"lessThan": "c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}, {"lessThan": "32c1f305cfad192cd98468140beedeffe4792f53", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}, {"lessThan": "31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}, {"lessThan": "614f873268c5b172804c9af6639bd17b7e1e2359", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}, {"lessThan": "704ecd010d4a9b33160e40b74eb402f6b86a18e0", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}, {"lessThan": "0d8e2404925a0607ffec79a53170715a46936896", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}, {"lessThan": "3dfaae04243cde460d82dfc2a7dd0bb6664d20ae", "status": "affected", "version": "e180a6b7759a99a28cbcce3547c4c80822cb6c2a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/params.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.30"}, {"lessThan": "2.6.30", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89552", "lastModified": "2026-10-30T13:20:21.423", "metrics": {}, "published": "2026-09-11T20:19:38.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/32c1f305cfad192cd98468140beedeffe4792f53"}, {"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", "url": "https://git.kernel.org/stable/c/72835d539ed3eb4c4b85b85a3f3976c7bdc70b91"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Denial of Service via NULL pointer dereference in parameter handling", "id": "2532253", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532253"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel. When updating charp parameters, an allocation failure can cause the parameter to be set to NULL before the new value is successfully allocated. This can lead to a kernel NULL pointer dereference, which may result in a system crash and a denial of service."], "name": "CVE-2026-89552", "public_date": "2026-09-11T19:44:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89552\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89552\nhttps://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896\nhttps://git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae\nhttps://git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359\nhttps://git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e180a6b7759a99a28cbcce3547c4c80822cb6c2a,614f873268c5b172804c9af6639bd17b7e1e2359)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e180a6b7759a99a28cbcce3547c4c80822cb6c2a,704ecd010d4a9b33160e40b74eb402f6b86a18e0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e180a6b7759a99a28cbcce3547c4c80822cb6c2a,0d8e2404925a0607ffec79a53170715a46936896)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e180a6b7759a99a28cbcce3547c4c80822cb6c2a,3dfaae04243cde460d82dfc2a7dd0bb6664d20ae)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.30"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.30)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T07:15:10.614361+00:00", "title": "Kernel Null Pointer Dereference in zswap Parameter Handling Leading to Crash", "updated": "2026-09-15T22:00:17.654112+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}