{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50738","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-24T13:02:21.542Z","datePublished":"2025-12-24T13:05:36.801Z","dateUpdated":"2026-05-11T19:24:33.729Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:24:33.729Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost-vdpa: fix an iotlb memory leak\n\nBefore commit 3d5698793897 (\"vhost-vdpa: introduce asid based IOTLB\")\nwe called vhost_vdpa_iotlb_unmap(v, iotlb, 0ULL, 0ULL - 1) during\nrelease to free all the resources allocated when processing user IOTLB\nmessages through vhost_vdpa_process_iotlb_update().\nThat commit changed the handling of IOTLB a bit, and we accidentally\nremoved some code called during the release.\n\nWe partially fixed this with commit 037d4305569a (\"vhost-vdpa: call\nvhost_vdpa_cleanup during the release\") but a potential memory leak is\nstill there as showed by kmemleak if the application does not send\nVHOST_IOTLB_INVALIDATE or crashes:\n\n  unreferenced object 0xffff888007fbaa30 (size 16):\n    comm \"blkio-bench\", pid 914, jiffies 4294993521 (age 885.500s)\n    hex dump (first 16 bytes):\n      40 73 41 07 80 88 ff ff 00 00 00 00 00 00 00 00  @sA.............\n    backtrace:\n      [<0000000087736d2a>] kmem_cache_alloc_trace+0x142/0x1c0\n      [<0000000060740f50>] vhost_vdpa_process_iotlb_msg+0x68c/0x901 [vhost_vdpa]\n      [<0000000083e8e205>] vhost_chr_write_iter+0xc0/0x4a0 [vhost]\n      [<000000008f2f414a>] vhost_vdpa_chr_write_iter+0x18/0x20 [vhost_vdpa]\n      [<00000000de1cd4a0>] vfs_write+0x216/0x4b0\n      [<00000000a2850200>] ksys_write+0x71/0xf0\n      [<00000000de8e720b>] __x64_sys_write+0x19/0x20\n      [<0000000018b12cbb>] do_syscall_64+0x3f/0x90\n      [<00000000986ec465>] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nLet's fix this calling vhost_vdpa_iotlb_unmap() on the whole range in\nvhost_vdpa_remove_as(). We move that call before vhost_dev_cleanup()\nsince we need a valid v->vdev.mm in vhost_vdpa_pa_unmap().\nvhost_iotlb_reset() call can be removed, since vhost_vdpa_iotlb_unmap()\non the whole range removes all the entries.\n\nThe kmemleak log reported was observed with a vDPA device that has `use_va`\nset to true (e.g. VDUSE). This patch has been tested with both types of\ndevices."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/vdpa.c"],"versions":[{"version":"3d5698793897a2b9c0060d899881d1a0591630d5","lessThan":"4e92cb33bfb51eee5f28bb10846c46f266a4bb67","status":"affected","versionType":"git"},{"version":"3d5698793897a2b9c0060d899881d1a0591630d5","lessThan":"a2907867e2c86067accd2f011d6f23ee5533aa6c","status":"affected","versionType":"git"},{"version":"3d5698793897a2b9c0060d899881d1a0591630d5","lessThan":"c070c1912a83432530cbb4271d5b9b11fa36b67a","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vhost/vdpa.c"],"versions":[{"version":"5.19","status":"affected"},{"version":"0","lessThan":"5.19","status":"unaffected","versionType":"semver"},{"version":"6.0.19","lessThanOrEqual":"6.0.*","status":"unaffected","versionType":"semver"},{"version":"6.1.5","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.0.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4e92cb33bfb51eee5f28bb10846c46f266a4bb67"},{"url":"https://git.kernel.org/stable/c/a2907867e2c86067accd2f011d6f23ee5533aa6c"},{"url":"https://git.kernel.org/stable/c/c070c1912a83432530cbb4271d5b9b11fa36b67a"}],"title":"vhost-vdpa: fix an iotlb memory leak","x_generator":{"engine":"bippy-1.2.0"}}}}