{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50270", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-15T13:58:00.975Z", "datePublished": "2025-09-15T14:21:06.735Z", "dateUpdated": "2026-08-05T08:58:00.180Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:00.180Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix the assign logic of iocb\n\ncommit 18ae8d12991b (\"f2fs: show more DIO information in tracepoint\")\nintroduces iocb field in 'f2fs_direct_IO_enter' trace event\nAnd it only assigns the pointer and later it accesses its field\nin trace print log.\n\nUnable to handle kernel paging request at virtual address ffffffc04cef3d30\nMem abort info:\nESR = 0x96000007\nEC = 0x25: DABT (current EL), IL = 32 bits\n\n pc : trace_raw_output_f2fs_direct_IO_enter+0x54/0xa4\n lr : trace_raw_output_f2fs_direct_IO_enter+0x2c/0xa4\n sp : ffffffc0443cbbd0\n x29: ffffffc0443cbbf0 x28: ffffff8935b120d0 x27: ffffff8935b12108\n x26: ffffff8935b120f0 x25: ffffff8935b12100 x24: ffffff8935b110c0\n x23: ffffff8935b10000 x22: ffffff88859a936c x21: ffffff88859a936c\n x20: ffffff8935b110c0 x19: ffffff8935b10000 x18: ffffffc03b195060\n x17: ffffff8935b11e76 x16: 00000000000000cc x15: ffffffef855c4f2c\n x14: 0000000000000001 x13: 000000000000004e x12: ffff0000ffffff00\n x11: ffffffef86c350d0 x10: 00000000000010c0 x9 : 000000000fe0002c\n x8 : ffffffc04cef3d28 x7 : 7f7f7f7f7f7f7f7f x6 : 0000000002000000\n x5 : ffffff8935b11e9a x4 : 0000000000006250 x3 : ffff0a00ffffff04\n x2 : 0000000000000002 x1 : ffffffef86a0a31f x0 : ffffff8935b10000\n Call trace:\n trace_raw_output_f2fs_direct_IO_enter+0x54/0xa4\n print_trace_fmt+0x9c/0x138\n print_trace_line+0x154/0x254\n tracing_read_pipe+0x21c/0x380\n vfs_read+0x108/0x3ac\n ksys_read+0x7c/0xec\n __arm64_sys_read+0x20/0x30\n invoke_syscall+0x60/0x150\n el0_svc_common.llvm.1237943816091755067+0xb8/0xf8\n do_el0_svc+0x28/0xa0\n\nFix it by copying the required variables for printing and while at\nit fix the similar issue at some other places in the same file." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires local access via f2fs direct I/O or unlink syscalls to record the event, then reading the human-readable trace output through tracefs; it is not reachable from the network stack or remote protocols.\nAC:L - An attacker who can enable the f2fs_direct_IO_enter (or unlink) event and perform O_DIRECT I/O or unlink on an f2fs mount can reliably record a dangling pointer and trigger the unsafe dereference on the next formatted trace read, with no race or uncontrollable precondition.\nPR:L - On the primary real-world f2fs deployment (Android), an unprivileged local user can exercise the DIO/unlink paths that populate the ring buffer; analogous tracepoint dangling-pointer CVEs (e.g. CVE-2025-37938) are scored PR:L, and when uncertain the higher-severity choice applies.\nUI:N - No victim interaction is required; the attacker can enable the event, trigger f2fs DIO/unlink, and read the formatted trace themselves without another user taking action.\nS:U - Impact stays within the local kernel's security authority; this is a standard in-kernel UAF/DoS path with no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - The print path dereferences a stale kiocb (and similarly may walk a freed dentry name via %s), copying freed/reused kernel memory into the userspace trace buffer—matching the UAF/info-disclosure guidance for high confidentiality impact.\nI:N - TP_printk only reads the dangling fields for formatting and does not write through the stale pointer, so there is no integrity or control-flow write primitive from this bug.\nA:H - The reported failure is a kernel paging-request oops in trace_raw_output_f2fs_direct_IO_enter while reading trace_pipe, which is a full availability impact under CVSS kernel guidance." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/trace/events/f2fs.h" ], "versions": [ { "version": "bd984c03097b8e9b7500cba7378040ac1c697dbb", "lessThan": "d555aa37566c5c3728f2e52047a9722eae2aed93", "status": "affected", "versionType": "git" }, { "version": "bd984c03097b8e9b7500cba7378040ac1c697dbb", "lessThan": "b4244ca341ea95c52ee8fa93d04f5af3e584dd37", "status": "affected", "versionType": "git" }, { "version": "bd984c03097b8e9b7500cba7378040ac1c697dbb", "lessThan": "0db18eec0d9a7ee525209e31e3ac2f673545b12f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/trace/events/f2fs.h" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.2", "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": "5.17", "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" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d555aa37566c5c3728f2e52047a9722eae2aed93" }, { "url": "https://git.kernel.org/stable/c/b4244ca341ea95c52ee8fa93d04f5af3e584dd37" }, { "url": "https://git.kernel.org/stable/c/0db18eec0d9a7ee525209e31e3ac2f673545b12f" } ], "title": "f2fs: fix the assign logic of iocb", "x_generator": { "engine": "bippy-1.2.0" } } } }