{"cve":"CVE-2022-48726","nvd":{"published":"2024-06-20T12:15:11.077","modified":"2026-08-04T10:17:17.803","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Protect mc during concurrent multicast leaves\n\nPartially revert the commit mentioned in the Fixes line to make sure that\nallocation and erasing multicast struct are locked.\n\n  BUG: KASAN: use-after-free in ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline]\n  BUG: KASAN: use-after-free in ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579\n  Read of size 8 at addr ffff88801bb74b00 by task syz-executor.1/25529\n  CPU: 0 PID: 25529 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n  Call Trace:\n   __dump_stack lib/dump_stack.c:88 [inline]\n   dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n   print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247\n   __kasan_report mm/kasan/report.c:433 [inline]\n   kasan_report.cold+0x83/0xdf mm/kasan/report.c:450\n   ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline]\n   ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579\n   ucma_destroy_id+0x1e6/0x280 drivers/infiniband/core/ucma.c:614\n   ucma_write+0x25c/0x350 drivers/infiniband/core/ucma.c:1732\n   vfs_write+0x28e/0xae0 fs/read_write.c:588\n   ksys_write+0x1ee/0x250 fs/read_write.c:643\n   do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nCurrently the xarray search can touch a concurrently freeing mc as the\nxa_for_each() is not surrounded by any lock. Rather than hold the lock for\na full scan hold it only for the effected items, which is usually an empty\nlist.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/2923948ffe0835f7114e948b35bcc42bc9b3baa1","https://git.kernel.org/stable/c/36e8169ec973359f671f9ec7213547059cae972e","https://git.kernel.org/stable/c/75c610212b9f1756b9384911d3a2c347eee8031c","https://git.kernel.org/stable/c/ee2477e8ccd3d978eeac0dc5a981b286d9bb7b0a","https://git.kernel.org/stable/c/2923948ffe0835f7114e948b35bcc42bc9b3baa1"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:00.836172422+00:00"},"epss":{"cve":"CVE-2022-48726","score":0.00238,"percentile":0.14889,"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."]}