{"id":"CVE-2026-89552","summary":"params: fix charp corruption on allocation failure","details":"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.","modified":"2026-09-13T03:46:32.146429115Z","published":"2026-09-11T19:44:26.091Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89552.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359"},{"type":"WEB","url":"https://git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89552.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89552"},{"type":"PACKAGE","url":"https://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":[{"introduced":"e180a6b7759a99a28cbcce3547c4c80822cb6c2a"},{"fixed":"614f873268c5b172804c9af6639bd17b7e1e2359"},{"fixed":"704ecd010d4a9b33160e40b74eb402f6b86a18e0"},{"fixed":"0d8e2404925a0607ffec79a53170715a46936896"},{"fixed":"3dfaae04243cde460d82dfc2a7dd0bb6664d20ae"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89552.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.30"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89552.json"}}],"schema_version":"1.9.0"}