{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50406", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:53:07.001Z", "datePublished": "2025-09-18T16:03:51.155Z", "dateUpdated": "2026-08-05T08:58:37.126Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:37.126Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niomap: iomap: fix memory corruption when recording errors during writeback\n\nEvery now and then I see this crash on arm64:\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000000000000f8\nBuffer I/O error on dev dm-0, logical block 8733687, async page read\nMem abort info:\n ESR = 0x0000000096000006\n EC = 0x25: DABT (current EL), IL = 32 bits\n SET = 0, FnV = 0\n EA = 0, S1PTW = 0\n FSC = 0x06: level 2 translation fault\nData abort info:\n ISV = 0, ISS = 0x00000006\n CM = 0, WnR = 0\nuser pgtable: 64k pages, 42-bit VAs, pgdp=0000000139750000\n[00000000000000f8] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000, pmd=0000000000000000\nInternal error: Oops: 96000006 [#1] PREEMPT SMP\nBuffer I/O error on dev dm-0, logical block 8733688, async page read\nDumping ftrace buffer:\nBuffer I/O error on dev dm-0, logical block 8733689, async page read\n (ftrace buffer empty)\nXFS (dm-0): log I/O error -5\nModules linked in: dm_thin_pool dm_persistent_data\nXFS (dm-0): Metadata I/O Error (0x1) detected at xfs_trans_read_buf_map+0x1ec/0x590 [xfs] (fs/xfs/xfs_trans_buf.c:296).\n dm_bio_prison\nXFS (dm-0): Please unmount the filesystem and rectify the problem(s)\nXFS (dm-0): xfs_imap_lookup: xfs_ialloc_read_agi() returned error -5, agno 0\n dm_bufio dm_log_writes xfs nft_chain_nat xt_REDIRECT nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_REJECT\npotentially unexpected fatal signal 6.\n nf_reject_ipv6\npotentially unexpected fatal signal 6.\n ipt_REJECT nf_reject_ipv4\nCPU: 1 PID: 122166 Comm: fsstress Tainted: G W 6.0.0-rc5-djwa #rc5 3004c9f1de887ebae86015f2677638ce51ee7\n rpcsec_gss_krb5 auth_rpcgss xt_tcpudp ip_set_hash_ip ip_set_hash_net xt_set nft_compat ip_set_hash_mac ip_set nf_tables\nHardware name: QEMU KVM Virtual Machine, BIOS 1.5.1 06/16/2021\npstate: 60001000 (nZCv daif -PAN -UAO -TCO -DIT +SSBS BTYPE=--)\n ip_tables\npc : 000003fd6d7df200\n x_tables\nlr : 000003fd6d7df1ec\n overlay nfsv4\nCPU: 0 PID: 54031 Comm: u4:3 Tainted: G W 6.0.0-rc5-djwa #rc5 3004c9f1de887ebae86015f2677638ce51ee7405\nHardware name: QEMU KVM Virtual Machine, BIOS 1.5.1 06/16/2021\nWorkqueue: writeback wb_workfn\nsp : 000003ffd9522fd0\n (flush-253:0)\npstate: 60401005 (nZCv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--)\npc : errseq_set+0x1c/0x100\nx29: 000003ffd9522fd0 x28: 0000000000000023 x27: 000002acefeb6780\nx26: 0000000000000005 x25: 0000000000000001 x24: 0000000000000000\nx23: 00000000ffffffff x22: 0000000000000005\nlr : __filemap_set_wb_err+0x24/0xe0\n x21: 0000000000000006\nsp : fffffe000f80f760\nx29: fffffe000f80f760 x28: 0000000000000003 x27: fffffe000f80f9f8\nx26: 0000000002523000 x25: 00000000fffffffb x24: fffffe000f80f868\nx23: fffffe000f80fbb0 x22: fffffc0180c26a78 x21: 0000000002530000\nx20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000\n\nx17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000\nx14: 0000000000000001 x13: 0000000000470af3 x12: fffffc0058f70000\nx11: 0000000000000040 x10: 0000000000001b20 x9 : fffffe000836b288\nx8 : fffffc00eb9fd480 x7 : 0000000000f83659 x6 : 0000000000000000\nx5 : 0000000000000869 x4 : 0000000000000005 x3 : 00000000000000f8\nx20: 000003fd6d740020 x19: 000000000001dd36 x18: 0000000000000001\nx17: 000003fd6d78704c x16: 0000000000000001 x15: 000002acfac87668\nx2 : 0000000000000ffa x1 : 00000000fffffffb x0 : 00000000000000f8\nCall trace:\n errseq_set+0x1c/0x100\n __filemap_set_wb_err+0x24/0xe0\n iomap_do_writepage+0x5e4/0xd5c\n write_cache_pages+0x208/0x674\n iomap_writepages+0x34/0x60\n xfs_vm_writepages+0x8c/0xcc [xfs 7a861f39c43631f15d3a5884246ba5035d4ca78b]\nx14: 0000000000000000 x13: 2064656e72757465 x12: 0000000000002180\nx11: 000003fd6d8a82d0 x10: 0000000000000000 x9 : 000003fd6d8ae288\nx8 : 0000000000000083 x7 : 00000000ffffffff x6 : 00000000ffffffee\nx5 : 00000000fbad2887 x4 : 000003fd6d9abb58 x3 : 000003fd6d740020\nx2 : 0000000000000006 x1 : 000000000001dd36 x0 : 0000000000000000\nCPU: \n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is iomap writeback (iomap_writepages → iomap_do_writepage → iomap_writepage_map) for local filesystems using iomap (XFS, GFS2, zonefs), reached by dirtying and syncing a local file. It is not in a network protocol parser; remote services only hit it indirectly via local FS writeback.\nAC:L - An unprivileged attacker can induce map_blocks failures (e.g. ENOSPC on XFS delalloc conversion) and control both sides of the race by syncing/writeback on one thread while truncating or invalidating the same file on another, so success does not depend on conditions outside their influence.\nPR:L - Any unprivileged user who can write files on an iomap-backed filesystem (commonly XFS on servers/cloud images) can dirty pages, force writeback errors, and race truncate/invalidate; no init-namespace root or capabilities are required.\nUI:N - The attacker creates, writes, syncs, and truncates their own files on an already-mounted filesystem; no separate victim action such as mounting a volume or opening a crafted file is required.\nS:U - Impact is host-kernel memory corruption / oops within the same OS security authority, enabling local privilege escalation or DoS, not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - After unlock, folio->mapping may be cleared or the folio reused; mapping_set_error then operates on a stale mapping pointer (author: memory corruption / wrong-file error), which is UAF-style corruption that can be leveraged for kernel information disclosure.\nI:H - mapping_set_error performs kernel writes (errseq_set on wb_err/s_wb_err and set_bit on mapping flags) through folio->mapping after it may point at reused or unrelated memory, yielding a write/corruption primitive consistent with integrity High.\nA:H - The demonstrated failure is a kernel NULL pointer dereference in errseq_set during writeback (wb_workfn), causing oops/panic, and any folio mapping UAF remains crashable even without a full exploit." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/iomap/buffered-io.c" ], "versions": [ { "version": "150d5be09ce49a9bed6feb7b7dc4e5ae188778ec", "lessThan": "82c66c46f73b88be74c869e2cbfef45281adf3c6", "status": "affected", "versionType": "git" }, { "version": "150d5be09ce49a9bed6feb7b7dc4e5ae188778ec", "lessThan": "7308591d9c7787aec58f6a01a7823f14e90db7a2", "status": "affected", "versionType": "git" }, { "version": "150d5be09ce49a9bed6feb7b7dc4e5ae188778ec", "lessThan": "3d5f3ba1ac28059bdf7000cae2403e4e984308d2", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/iomap/buffered-io.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "4.6", "versionEndExcluding": "5.19.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.0.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/82c66c46f73b88be74c869e2cbfef45281adf3c6" }, { "url": "https://git.kernel.org/stable/c/7308591d9c7787aec58f6a01a7823f14e90db7a2" }, { "url": "https://git.kernel.org/stable/c/3d5f3ba1ac28059bdf7000cae2403e4e984308d2" } ], "title": "iomap: iomap: fix memory corruption when recording errors during writeback", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50406", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-01-14T19:07:48.115623Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:13:08.377Z" } } ] } }