{"id":"CVE-2022-48862","state":"PUBLISHED","title":"vhost: fix hung thread due to erroneous iotlb entries","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.","publishedAt":"2024-07-16T12:25:25.833Z","updatedAt":"2026-05-11T18:48:35.691Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","status":"affected","lessThan":"f8d88e86e90ea1002226d7ac2430152bfea003d1","versionType":"git"},{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","status":"affected","lessThan":"d9a747e6b6561280bf1791bb24c5e9e082193dad","versionType":"git"},{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","status":"affected","lessThan":"e2ae38cf3d91837a493cb2093c87700ff3cbe667","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/iotlb.c","drivers/vhost/vhost.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.15.29","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16.15","status":"unaffected","lessThanOrEqual":"5.16.*","versionType":"semver"},{"version":"5.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/iotlb.c","drivers/vhost/vhost.c"]}],"references":["https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1","https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad","https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/48xxx/CVE-2022-48862.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-48862","state":"PUBLISHED","datePublished":"2024-07-16T12:25:25.833Z","dateUpdated":"2026-05-11T18:48:35.691Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-07-16T11:38:08.920Z"},"containers":{"cna":{"title":"vhost: fix hung thread due to erroneous iotlb entries","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","status":"affected","lessThan":"f8d88e86e90ea1002226d7ac2430152bfea003d1","versionType":"git"},{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","status":"affected","lessThan":"d9a747e6b6561280bf1791bb24c5e9e082193dad","versionType":"git"},{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","status":"affected","lessThan":"e2ae38cf3d91837a493cb2093c87700ff3cbe667","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/iotlb.c","drivers/vhost/vhost.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.15.29","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16.15","status":"unaffected","lessThanOrEqual":"5.16.*","versionType":"semver"},{"version":"5.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/iotlb.c","drivers/vhost/vhost.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1"},{"url":"https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad"},{"url":"https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T18:48:35.691Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.15.29"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.16.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.17"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T15:25:01.590Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2022-48862","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:25:28.698724Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-11T17:34:07.306Z"}}]}}}