{"id":"CVE-2026-46118","summary":"pseries/papr-hvpipe: Fix null ptr deref in papr_hvpipe_dev_create_handle()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npseries/papr-hvpipe: Fix null ptr deref in papr_hvpipe_dev_create_handle()\n\ncommit 6d3789d347a7 (\"papr-hvpipe: convert papr_hvpipe_dev_create_handle() to FD_PREPARE()\"),\nchanged the create handle to FD_PREPARE(), but it caused kernel\nnull-ptr-deref because after call to retain_and_null_ptr(src_info),\nsrc_info is re-used for adding it to the global list.\n\nGetting the following kernel panic in papr_hvpipe_dev_create_handle()\nwhen trying to add src_info to the list.\n Kernel attempted to write user page (0) - exploit attempt? (uid: 0)\n BUG: Kernel NULL pointer dereference on write at 0x00000000\n Faulting instruction address: 0xc0000000001b44a0\n Oops: Kernel access of bad area, sig: 11 [#1]\n ...\n Call Trace:\n papr_hvpipe_dev_ioctl+0x1f4/0x48c (unreliable)\n sys_ioctl+0x528/0x1064\n system_call_exception+0x128/0x360\n system_call_vectored_common+0x15c/0x2ec\n\nNow, the error handling with FD_PREPARE's file cleanup and __free(kfree) auto\ncleanup is getting too convoluted. This is mainly because we need to\nensure only 1 user get the srcID handle. To simplify this, we allocate\nprepare the src_info in the beginning and add it to the global list\nunder a spinlock after checking that no duplicates exist.\n\nThis simplify the error handling where if the FD_ADD fails, we can\nsimply remove the src_info from the list and consume any pending msg in\nhvpipe to be cleared, after src_info became visible in the global list.","modified":"2026-07-15T01:48:54.010078766Z","published":"2026-05-28T09:35:33.635Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46118.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1b9f7aafa44f5ce852c00509104d10fd9eb0f402"},{"type":"WEB","url":"https://git.kernel.org/stable/c/735439394dde8462f9b50566727fbe333beaadaf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf51bec1560f8bf115d1476f60335f9d90e110b0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46118.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46118"},{"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":"09c15bbbed533903e600660ea09098b3b0524f48"},{"fixed":"735439394dde8462f9b50566727fbe333beaadaf"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6d3789d347a7af5c4b0b2da3af47b8d9da607ab2"},{"fixed":"cf51bec1560f8bf115d1476f60335f9d90e110b0"},{"fixed":"1b9f7aafa44f5ce852c00509104d10fd9eb0f402"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.32"},{"fixed":"6.18.33"}]}],"versions":["v6.18.32"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46118.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46118.json"}}],"schema_version":"1.7.5"}