{"cve":"CVE-2022-49353","nvd":{"published":"2025-02-26T07:01:12.013","modified":"2026-06-17T05:17:48.163","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/papr_scm: don't requests stats with '0' sized stats buffer\n\nSachin reported [1] that on a POWER-10 lpar he is seeing a kernel panic being\nreported with vPMEM when papr_scm probe is being called. The panic is of the\nform below and is observed only with following option disabled(profile) for the\nsaid LPAR 'Enable Performance Information Collection' in the HMC:\n\n Kernel attempted to write user page (1c) - exploit attempt? (uid: 0)\n BUG: Kernel NULL pointer dereference on write at 0x0000001c\n Faulting instruction address: 0xc008000001b90844\n Oops: Kernel access of bad area, sig: 11 [#1]\n<snip>\n NIP [c008000001b90844] drc_pmem_query_stats+0x5c/0x270 [papr_scm]\n LR [c008000001b92794] papr_scm_probe+0x2ac/0x6ec [papr_scm]\n Call Trace:\n       0xc00000000941bca0 (unreliable)\n       papr_scm_probe+0x2ac/0x6ec [papr_scm]\n       platform_probe+0x98/0x150\n       really_probe+0xfc/0x510\n       __driver_probe_device+0x17c/0x230\n<snip>\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception\n\nOn investigation looks like this panic was caused due to a 'stat_buffer' of\nsize==0 being provided to drc_pmem_query_stats() to fetch all performance\nstats-ids of an NVDIMM. However drc_pmem_query_stats() shouldn't have been called\nsince the vPMEM NVDIMM doesn't support and performance stat-id's. This was caused\ndue to missing check for 'p->stat_buffer_len' at the beginning of\npapr_scm_pmu_check_events() which indicates that the NVDIMM doesn't support\nperformance-stats.\n\nFix this by introducing the check for 'p->stat_buffer_len' at the beginning of\npapr_scm_pmu_check_events().\n\n[1] https://lore.kernel.org/all/6B3A522A-6A5F-4CC9-B268-0C63AA6E07D3@linux.ibm.com","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/07bf9431b1590d1cd7a8d62075d0b50b073f0495","https://git.kernel.org/stable/c/e1295aab2ebcda1c1a9ed342baedc080e5c393e5"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2022-49353","score":0.0023,"percentile":0.13933,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}