{"id":"CVE-2022-50743","state":"PUBLISHED","title":"erofs: Fix pcluster memleak when its block address is zero","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: Fix pcluster memleak when its block address is zero\n\nsyzkaller reported a memleak:\nhttps://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed\n\nunreferenced object 0xffff88811009c7f8 (size 136):\n  ...\n  backtrace:\n    [<ffffffff821db19b>] z_erofs_do_read_page+0x99b/0x1740\n    [<ffffffff821dee9e>] z_erofs_readahead+0x24e/0x580\n    [<ffffffff814bc0d6>] read_pages+0x86/0x3d0\n    ...\n\nsyzkaller constructed a case: in z_erofs_register_pcluster(),\nztailpacking = false and map->m_pa = zero. This makes pcl->obj.index be\nzero although pcl is not a inline pcluster.\n\nThen following path adds refcount for grp, but the refcount won't be put\nbecause pcl is inline.\n\nz_erofs_readahead()\n  z_erofs_do_read_page() # for another page\n    z_erofs_collector_begin()\n      erofs_find_workgroup()\n        erofs_workgroup_get()\n\nSince it's illegal for the block address of a non-inlined pcluster to\nbe zero, add check here to avoid registering the pcluster which would\nbe leaked.","publishedAt":"2025-12-24T13:05:40.297Z","updatedAt":"2026-05-11T19:24:39.573Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cecf864d3d76d50e3d9c58145e286a0b8c284e92","status":"affected","lessThan":"ac54c1f7b288d83b6ba1e320efff24ecc21309cd","versionType":"git"},{"version":"cecf864d3d76d50e3d9c58145e286a0b8c284e92","status":"affected","lessThan":"618e712b99c78d1004b70a1a9ab0a4830d0b2673","versionType":"git"},{"version":"cecf864d3d76d50e3d9c58145e286a0b8c284e92","status":"affected","lessThan":"c42c0ffe81176940bd5dead474216b7198d77675","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/erofs/zdata.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.0.16","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1.2","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/erofs/zdata.c"]}],"references":["https://git.kernel.org/stable/c/ac54c1f7b288d83b6ba1e320efff24ecc21309cd","https://git.kernel.org/stable/c/618e712b99c78d1004b70a1a9ab0a4830d0b2673","https://git.kernel.org/stable/c/c42c0ffe81176940bd5dead474216b7198d77675"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/50xxx/CVE-2022-50743.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50743","state":"PUBLISHED","datePublished":"2025-12-24T13:05:40.297Z","dateUpdated":"2026-05-11T19:24:39.573Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T13:02:21.543Z"},"containers":{"cna":{"title":"erofs: Fix pcluster memleak when its block address is zero","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: Fix pcluster memleak when its block address is zero\n\nsyzkaller reported a memleak:\nhttps://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed\n\nunreferenced object 0xffff88811009c7f8 (size 136):\n  ...\n  backtrace:\n    [<ffffffff821db19b>] z_erofs_do_read_page+0x99b/0x1740\n    [<ffffffff821dee9e>] z_erofs_readahead+0x24e/0x580\n    [<ffffffff814bc0d6>] read_pages+0x86/0x3d0\n    ...\n\nsyzkaller constructed a case: in z_erofs_register_pcluster(),\nztailpacking = false and map->m_pa = zero. This makes pcl->obj.index be\nzero although pcl is not a inline pcluster.\n\nThen following path adds refcount for grp, but the refcount won't be put\nbecause pcl is inline.\n\nz_erofs_readahead()\n  z_erofs_do_read_page() # for another page\n    z_erofs_collector_begin()\n      erofs_find_workgroup()\n        erofs_workgroup_get()\n\nSince it's illegal for the block address of a non-inlined pcluster to\nbe zero, add check here to avoid registering the pcluster which would\nbe leaked."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cecf864d3d76d50e3d9c58145e286a0b8c284e92","status":"affected","lessThan":"ac54c1f7b288d83b6ba1e320efff24ecc21309cd","versionType":"git"},{"version":"cecf864d3d76d50e3d9c58145e286a0b8c284e92","status":"affected","lessThan":"618e712b99c78d1004b70a1a9ab0a4830d0b2673","versionType":"git"},{"version":"cecf864d3d76d50e3d9c58145e286a0b8c284e92","status":"affected","lessThan":"c42c0ffe81176940bd5dead474216b7198d77675","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/erofs/zdata.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.0.16","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1.2","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/erofs/zdata.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ac54c1f7b288d83b6ba1e320efff24ecc21309cd"},{"url":"https://git.kernel.org/stable/c/618e712b99c78d1004b70a1a9ab0a4830d0b2673"},{"url":"https://git.kernel.org/stable/c/c42c0ffe81176940bd5dead474216b7198d77675"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:24:39.573Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.0.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.1.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}