{"id":"CVE-2022-48862","url":"https://www.cyber-defence.io/tools/cve/CVE-2022-48862","generatedAt":"2026-10-27T19:39:20.319Z","title":"In the Linux kernel, the following vulnerability has been resolved: vhost: fix hung thread due to erroneous iotlb entries In vhost_iotlb_add_range_ctx(), range size can overflow to 0 when start is 0 and last is ULONG_MAX.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: fix hung thread due to erroneous iotlb entries\n\nIn vhost_iotlb_add_range_ctx(), range size can overflow to 0 when\nstart is 0 and last is ULONG_MAX. One instance where it can happen\nis when userspace sends an IOTLB message with iova=size=uaddr=0\n(vhost_process_iotlb_msg). So, an entry with size = 0, start = 0,\nlast = ULONG_MAX ends up in the iotlb. Next time a packet is sent,\niotlb_access_ok() loops indefinitely due to that erroneous entry.\n\n\tCall Trace:\n\t <TASK>\n\t iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340\n\t vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366\n\t vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104\n\t vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372\n\t kthread+0x2e9/0x3a0 kernel/kthread.c:377\n\t ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\n\t </TASK>\n\nReported by syzbot at:\n\thttps://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87\n\nTo fix this, do two things:\n\n1. Return -EINVAL in vhost_chr_write_iter() when userspace asks to map\n   a range with size 0.\n2. Fix vhost_iotlb_add_range_ctx() to handle the range [0, ULONG_MAX]\n   by splitting it into two entries.","published":"2024-07-16T13:15:13.000Z","lastModified":"2026-06-17T05:16:25.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-835"],"affected":["linux/linux kernel"],"epss":{"score":0.00209,"percentile":0.11021,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-48862","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}