CVE-2024-49934 (GCVE-0-2024-49934)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2026-08-05 11:40
VLAI
Title
fs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name It's observed that a crash occurs during hot-remove a memory device, in which user is accessing the hugetlb. See calltrace as following: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 14045 at arch/x86/mm/fault.c:1278 do_user_addr_fault+0x2a0/0x790 Modules linked in: kmem device_dax cxl_mem cxl_pmem cxl_port cxl_pci dax_hmem dax_pmem nd_pmem cxl_acpi nd_btt cxl_core crc32c_intel nvme virtiofs fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc s mirror dm_region_hash dm_log dm_mod CPU: 1 PID: 14045 Comm: daxctl Not tainted 6.10.0-rc2-lizhijian+ #492 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 RIP: 0010:do_user_addr_fault+0x2a0/0x790 Code: 48 8b 00 a8 04 0f 84 b5 fe ff ff e9 1c ff ff ff 4c 89 e9 4c 89 e2 be 01 00 00 00 bf 02 00 00 00 e8 b5 ef 24 00 e9 42 fe ff ff <0f> 0b 48 83 c4 08 4c 89 ea 48 89 ee 4c 89 e7 5b 5d 41 5c 41 5d 41 RSP: 0000:ffffc90000a575f0 EFLAGS: 00010046 RAX: ffff88800c303600 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000001000 RSI: ffffffff82504162 RDI: ffffffff824b2c36 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000a57658 R13: 0000000000001000 R14: ffff88800bc2e040 R15: 0000000000000000 FS: 00007f51cb57d880(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000001000 CR3: 00000000072e2004 CR4: 00000000001706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ? __warn+0x8d/0x190 ? do_user_addr_fault+0x2a0/0x790 ? report_bug+0x1c3/0x1d0 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x14/0x70 ? asm_exc_invalid_op+0x16/0x20 ? do_user_addr_fault+0x2a0/0x790 ? exc_page_fault+0x31/0x200 exc_page_fault+0x68/0x200 <...snip...> BUG: unable to handle page fault for address: 0000000000001000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP PTI ---[ end trace 0000000000000000 ]--- BUG: unable to handle page fault for address: 0000000000001000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 14045 Comm: daxctl Kdump: loaded Tainted: G W 6.10.0-rc2-lizhijian+ #492 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 RIP: 0010:dentry_name+0x1f4/0x440 <...snip...> ? dentry_name+0x2fa/0x440 vsnprintf+0x1f3/0x4f0 vprintk_store+0x23a/0x540 vprintk_emit+0x6d/0x330 _printk+0x58/0x80 dump_mapping+0x10b/0x1a0 ? __pfx_free_object_rcu+0x10/0x10 __dump_page+0x26b/0x3e0 ? vprintk_emit+0xe0/0x330 ? _printk+0x58/0x80 ? dump_page+0x17/0x50 dump_page+0x17/0x50 do_migrate_range+0x2f7/0x7f0 ? do_migrate_range+0x42/0x7f0 ? offline_pages+0x2f4/0x8c0 offline_pages+0x60a/0x8c0 memory_subsys_offline+0x9f/0x1c0 ? lockdep_hardirqs_on+0x77/0x100 ? _raw_spin_unlock_irqrestore+0x38/0x60 device_offline+0xe3/0x110 state_store+0x6e/0xc0 kernfs_fop_write_iter+0x143/0x200 vfs_write+0x39f/0x560 ksys_write+0x65/0xf0 do_syscall_64+0x62/0x130 Previously, some sanity check have been done in dump_mapping() before the print facility parsing '%pd' though, it's still possible to run into an invalid dentry.d_name.name. Since dump_mapping() only needs to dump the filename only, retrieve it by itself in a safer way to prevent an unnecessary crash. Note that either retrieving the filename with '%pd' or strncpy_from_kernel_nofault(), the filename could be unreliable.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:38 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1c6fb1d89e73cd3bbfae7c400f1c615272aa435f , < 1a4159138e718db6199f0abf376ad52f726dcc5c (git)
Affected: 1c6fb1d89e73cd3bbfae7c400f1c615272aa435f , < e0f6ee75f50476607ca82fc7c3711c795ce09b52 (git)
Affected: 1c6fb1d89e73cd3bbfae7c400f1c615272aa435f , < f92b8829c6e75632de4e2b9f70e7a7e6c5c2ba98 (git)
Affected: 1c6fb1d89e73cd3bbfae7c400f1c615272aa435f , < ef921bc72328b577cb45772ff7921cba4773b74a (git)
Affected: 1c6fb1d89e73cd3bbfae7c400f1c615272aa435f , < 7f7b850689ac06a62befe26e1fd1806799e7f152 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.10.14 , ≤ 6.10.* (semver)
Unaffected: 6.11.3 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name\n\nIt\u0027s observed that a crash occurs during hot-remove a memory device,\nin which user is accessing the hugetlb. See calltrace as following:\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 14045 at arch/x86/mm/fault.c:1278 do_user_addr_fault+0x2a0/0x790\nModules linked in: kmem device_dax cxl_mem cxl_pmem cxl_port cxl_pci dax_hmem dax_pmem nd_pmem cxl_acpi nd_btt cxl_core crc32c_intel nvme virtiofs fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc s\nmirror dm_region_hash dm_log dm_mod\nCPU: 1 PID: 14045 Comm: daxctl Not tainted 6.10.0-rc2-lizhijian+ #492\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\nRIP: 0010:do_user_addr_fault+0x2a0/0x790\nCode: 48 8b 00 a8 04 0f 84 b5 fe ff ff e9 1c ff ff ff 4c 89 e9 4c 89 e2 be 01 00 00 00 bf 02 00 00 00 e8 b5 ef 24 00 e9 42 fe ff ff \u003c0f\u003e 0b 48 83 c4 08 4c 89 ea 48 89 ee 4c 89 e7 5b 5d 41 5c 41 5d 41\nRSP: 0000:ffffc90000a575f0 EFLAGS: 00010046\nRAX: ffff88800c303600 RBX: 0000000000000000 RCX: 0000000000000000\nRDX: 0000000000001000 RSI: ffffffff82504162 RDI: ffffffff824b2c36\nRBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000a57658\nR13: 0000000000001000 R14: ffff88800bc2e040 R15: 0000000000000000\nFS:  00007f51cb57d880(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000001000 CR3: 00000000072e2004 CR4: 00000000001706f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n ? __warn+0x8d/0x190\n ? do_user_addr_fault+0x2a0/0x790\n ? report_bug+0x1c3/0x1d0\n ? handle_bug+0x3c/0x70\n ? exc_invalid_op+0x14/0x70\n ? asm_exc_invalid_op+0x16/0x20\n ? do_user_addr_fault+0x2a0/0x790\n ? exc_page_fault+0x31/0x200\n exc_page_fault+0x68/0x200\n\u003c...snip...\u003e\nBUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n ---[ end trace 0000000000000000 ]---\n BUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 14045 Comm: daxctl Kdump: loaded Tainted: G        W          6.10.0-rc2-lizhijian+ #492\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n RIP: 0010:dentry_name+0x1f4/0x440\n\u003c...snip...\u003e\n? dentry_name+0x2fa/0x440\nvsnprintf+0x1f3/0x4f0\nvprintk_store+0x23a/0x540\nvprintk_emit+0x6d/0x330\n_printk+0x58/0x80\ndump_mapping+0x10b/0x1a0\n? __pfx_free_object_rcu+0x10/0x10\n__dump_page+0x26b/0x3e0\n? vprintk_emit+0xe0/0x330\n? _printk+0x58/0x80\n? dump_page+0x17/0x50\ndump_page+0x17/0x50\ndo_migrate_range+0x2f7/0x7f0\n? do_migrate_range+0x42/0x7f0\n? offline_pages+0x2f4/0x8c0\noffline_pages+0x60a/0x8c0\nmemory_subsys_offline+0x9f/0x1c0\n? lockdep_hardirqs_on+0x77/0x100\n? _raw_spin_unlock_irqrestore+0x38/0x60\ndevice_offline+0xe3/0x110\nstate_store+0x6e/0xc0\nkernfs_fop_write_iter+0x143/0x200\nvfs_write+0x39f/0x560\nksys_write+0x65/0xf0\ndo_syscall_64+0x62/0x130\n\nPreviously, some sanity check have been done in dump_mapping() before\nthe print facility parsing \u0027%pd\u0027 though, it\u0027s still possible to run into\nan invalid dentry.d_name.name.\n\nSince dump_mapping() only needs to dump the filename only, retrieve it\nby itself in a safer way to prevent an unnecessary crash.\n\nNote that either retrieving the filename with \u0027%pd\u0027 or\nstrncpy_from_kernel_nofault(), the filename could be unreliable."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only through local kernel activity \u2014 page-cache/dentry churn plus a memory offline or page-state anomaly on the same machine \u2014 with no network-facing entry point. There is no remote protocol handler anywhere on the path from `dump_page()` to `dump_mapping()`.\nAC:L - Both sides of the race are attacker-influenceable: the attacker pins page-cache folios so `isolate_folio_to_list()`/`migrate_pages()` fail and force the `dump_page()` call, while concurrently renaming/unlinking long-named files to free the `external_name` allocation that `d_name.name` points at. Per the race-condition guidance, an attacker who creates both sides of the window scores Low.\nPR:L - An ordinary unprivileged user creates the entire vulnerable condition \u2014 the stale `d_name.name` pointer and the pinned/unmovable page-cache folios that trigger the dump \u2014 needing only normal filesystem and memory syscalls. In CXL tiering, virtio-mem, and balloon deployments the offline side is automated infrastructure rather than an operator action, so no elevated privilege is required of the attacker.\nUI:N - In memory-tiering and ballooning deployments the offline/migration pass runs automatically without any operator action, and the anomaly-triggered callers (`bad_page()`, `print_bad_pte()`, `filemap_unaccount_folio()`) require no victim involvement at all. The attacker\u0027s own pinning and dentry churn supply everything needed.\nS:U - The wild read and the resulting oops occur entirely within the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel memory-safety defect.\nC:H - `dentry_name()` reads an unbounded NUL-terminated run of kernel memory from a stale pointer and `pr_warn()` copies those bytes into the kernel ring buffer, which is world-readable by default (`kernel.dmesg_restrict=0`). Because the pointer is loaded from a freed `external_name`/dentry slot that an attacker can reclaim with sprayed data, the wild read can be steered toward a chosen kernel address, yielding an arbitrary-read-to-dmesg primitive rather than a bounded leak.\nI:N - `dump_mapping()` only loads from the stale pointer and formats the result; there is no out-of-bounds write, and `vsnprintf()`\u0027s `buf \u003c end` guard prevents the oversized string from overflowing the printk buffer. No kernel state is modified by the defect.\nA:H - The documented result is an unhandled supervisor page fault (\"BUG: unable to handle page fault for address: 0000000000001000\") at `dentry_name+0x1f4`, i.e. a kernel oops. It fires from inside `vprintk_store()` while the memory-hotplug path holds `mem_hotplug_lock`, so it can wedge printk and the hotplug machinery system-wide, and becomes a full panic under `panic_on_oops`."
            }
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        }
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          "url": "https://git.kernel.org/stable/c/1a4159138e718db6199f0abf376ad52f726dcc5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0f6ee75f50476607ca82fc7c3711c795ce09b52"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/7f7b850689ac06a62befe26e1fd1806799e7f152"
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      ],
      "title": "fs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49934",
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      "date": "2026-09-29",
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    "microsoft_vex": {
      "current_release_date": "2026-03-31T15:15:54.000Z",
      "cve": "CVE-2024-49934",
      "id": "msrc_CVE-2024-49934",
      "initial_release_date": "2024-10-01T07:00:00.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "fs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-49934.json",
      "version": "3"
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                  },
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                    "lessThan": "ef921bc72328b577cb45772ff7921cba4773b74a",
                    "status": "affected",
                    "version": "1c6fb1d89e73cd3bbfae7c400f1c615272aa435f",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7f7b850689ac06a62befe26e1fd1806799e7f152",
                    "status": "affected",
                    "version": "1c6fb1d89e73cd3bbfae7c400f1c615272aa435f",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/inode.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.0"
                  },
                  {
                    "lessThan": "5.0",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.120",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.64",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.10.*",
                    "status": "unaffected",
                    "version": "6.10.14",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.11.*",
                    "status": "unaffected",
                    "version": "6.11.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.12",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "652638C5-5F25-4DF3-AD42-DD3252A97152",
                    "versionEndExcluding": "6.10.14",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "54D9C704-D679-41A7-9C40-10A6B1E7FFE9",
                    "versionEndExcluding": "6.11.3",
                    "versionStartIncluding": "6.11",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name\n\nIt\u0027s observed that a crash occurs during hot-remove a memory device,\nin which user is accessing the hugetlb. See calltrace as following:\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 14045 at arch/x86/mm/fault.c:1278 do_user_addr_fault+0x2a0/0x790\nModules linked in: kmem device_dax cxl_mem cxl_pmem cxl_port cxl_pci dax_hmem dax_pmem nd_pmem cxl_acpi nd_btt cxl_core crc32c_intel nvme virtiofs fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc s\nmirror dm_region_hash dm_log dm_mod\nCPU: 1 PID: 14045 Comm: daxctl Not tainted 6.10.0-rc2-lizhijian+ #492\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\nRIP: 0010:do_user_addr_fault+0x2a0/0x790\nCode: 48 8b 00 a8 04 0f 84 b5 fe ff ff e9 1c ff ff ff 4c 89 e9 4c 89 e2 be 01 00 00 00 bf 02 00 00 00 e8 b5 ef 24 00 e9 42 fe ff ff \u003c0f\u003e 0b 48 83 c4 08 4c 89 ea 48 89 ee 4c 89 e7 5b 5d 41 5c 41 5d 41\nRSP: 0000:ffffc90000a575f0 EFLAGS: 00010046\nRAX: ffff88800c303600 RBX: 0000000000000000 RCX: 0000000000000000\nRDX: 0000000000001000 RSI: ffffffff82504162 RDI: ffffffff824b2c36\nRBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000a57658\nR13: 0000000000001000 R14: ffff88800bc2e040 R15: 0000000000000000\nFS:  00007f51cb57d880(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000001000 CR3: 00000000072e2004 CR4: 00000000001706f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n ? __warn+0x8d/0x190\n ? do_user_addr_fault+0x2a0/0x790\n ? report_bug+0x1c3/0x1d0\n ? handle_bug+0x3c/0x70\n ? exc_invalid_op+0x14/0x70\n ? asm_exc_invalid_op+0x16/0x20\n ? do_user_addr_fault+0x2a0/0x790\n ? exc_page_fault+0x31/0x200\n exc_page_fault+0x68/0x200\n\u003c...snip...\u003e\nBUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n ---[ end trace 0000000000000000 ]---\n BUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 14045 Comm: daxctl Kdump: loaded Tainted: G        W          6.10.0-rc2-lizhijian+ #492\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n RIP: 0010:dentry_name+0x1f4/0x440\n\u003c...snip...\u003e\n? dentry_name+0x2fa/0x440\nvsnprintf+0x1f3/0x4f0\nvprintk_store+0x23a/0x540\nvprintk_emit+0x6d/0x330\n_printk+0x58/0x80\ndump_mapping+0x10b/0x1a0\n? __pfx_free_object_rcu+0x10/0x10\n__dump_page+0x26b/0x3e0\n? vprintk_emit+0xe0/0x330\n? _printk+0x58/0x80\n? dump_page+0x17/0x50\ndump_page+0x17/0x50\ndo_migrate_range+0x2f7/0x7f0\n? do_migrate_range+0x42/0x7f0\n? offline_pages+0x2f4/0x8c0\noffline_pages+0x60a/0x8c0\nmemory_subsys_offline+0x9f/0x1c0\n? lockdep_hardirqs_on+0x77/0x100\n? _raw_spin_unlock_irqrestore+0x38/0x60\ndevice_offline+0xe3/0x110\nstate_store+0x6e/0xc0\nkernfs_fop_write_iter+0x143/0x200\nvfs_write+0x39f/0x560\nksys_write+0x65/0xf0\ndo_syscall_64+0x62/0x130\n\nPreviously, some sanity check have been done in dump_mapping() before\nthe print facility parsing \u0027%pd\u0027 though, it\u0027s still possible to run into\nan invalid dentry.d_name.name.\n\nSince dump_mapping() only needs to dump the filename only, retrieve it\nby itself in a safer way to prevent an unnecessary crash.\n\nNote that either retrieving the filename with \u0027%pd\u0027 or\nstrncpy_from_kernel_nofault(), the filename could be unreliable."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/inode: Evitar que dump_mapping() acceda a dentry.d_name.name no v\u00e1lido Se observa que se produce un bloqueo durante la eliminaci\u00f3n activa de un dispositivo de memoria, en el que el usuario est\u00e1 accediendo a hugetlb. Consulte el seguimiento de llamadas de la siguiente manera: ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 1 PID: 14045 en arch/x86/mm/fault.c:1278 do_user_addr_fault+0x2a0/0x790 M\u00f3dulos vinculados en: kmem device_dax cxl_mem cxl_pmem cxl_port cxl_pci dax_hmem dax_pmem nd_pmem cxl_acpi nd_btt cxl_core crc32c_intel nvme virtiofs fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc s mirror dm_region_hash dm_log dm_mod CPU: 1 PID: 14045 Comm: daxctl No contaminado 6.10.0-rc2-lizhijian+ #492 Nombre del hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 01/04/2014 RIP: 0010:do_user_addr_fault+0x2a0/0x790 C\u00f3digo: 48 8b 00 a8 04 0f 84 b5 fe ff ff e9 1c ff ff ff 4c 89 e9 4c 89 e2 be 01 00 00 00 bf 02 00 00 00 e8 b5 ef 24 00 e9 42 fe ff ff \u0026lt;0f\u0026gt; 0b 48 83 c4 08 4c 89 ea 48 89 ee 4c 89 e7 5b 5d 41 5c 41 5d 41 RSP: 0000:ffffc90000a575f0 EFLAGS: 00010046 RAX: ffff88800c303600 RBX: 0000000000000000 RCX: 000000000000000 RDX: 00000000000001000 RSI: ffffffff82504162 RDI: ffffffff824b2c36 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000000 R11: 0000000000000000 R12: ffffc90000a57658 R13: 0000000000001000 R14: ffff88800bc2e040 R15: 000000000000000 FS: 00007f51cb57d880(0000) GS:ffff88807fd00000(0000) knlGS:000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000001000 CR3: 00000000072e2004 CR4: 00000000001706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas:  ? __warn+0x8d/0x190 ? do_user_addr_fault+0x2a0/0x790 ? report_bug+0x1c3/0x1d0 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x14/0x70 ? asm_exc_invalid_op+0x16/0x20 ? do_user_addr_fault+0x2a0/0x790 ? exc_page_fault+0x31/0x200 exc_page_fault+0x68/0x200 \u0026lt;...snip...\u0026gt; ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: 0000000000001000 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - p\u00e1gina no presente PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP PTI ---[ fin del seguimiento 000000000000000 ]--- ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: 0000000000001000 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - p\u00e1gina no presente PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 14045 Comm: daxctl Kdump: cargado Tainted: GW 6.10.0-rc2-lizhijian+ #492 Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 RIP: 0010:dentry_name+0x1f4/0x440 \u0026lt;...snip...\u0026gt; ? dentry_name+0x2fa/0x440 vsnprintf+0x1f3/0x4f0 vprintk_store+0x23a/0x540 vprintk_emit+0x6d/0x330 _printk+0x58/0x80 dump_mapping+0x10b/0x1a0 ? __pfx_free_object_rcu+0x10/0x10 __dump_page+0x26b/0x3e0 ? vprintk_emit+0xe0/0x330 ? _printk+0x58/0x80 ? dump_page+0x17/0x50  dump_page+0x17/0x50 do_migrate_range+0x2f7/0x7f0 ? do_migrate_range+0x42/0x7f0 ? offline_pages+0x2f4/0x8c0 offline_pages+0x60a/0x8c0 memory_subsys_offline+0x9f/0x1c0 ? lockdep_hardirqs_on+0x77/0x100 ? _raw_spin_unlock_irqrestore+0x38/0x60 device_offline+0xe3/0x110 state_store+0x6e/0xc0 kernfs_fop_write_iter+0x143/0x200 vfs_write+0x39f/0x560 ksys_write+0x65/0xf0 do_syscall_64+0x62/0x130 Anteriormente, se han realizado algunas comprobaciones de cordura en dump_mapping() antes de que la funci\u00f3n de impresi\u00f3n analice \u0027%pd\u0027, aunque a\u00fan es posible encontrarse con un dentry.d_name.name no v\u00e1lido. Dado que dump_mapping() solo necesita volcar el nombre del archivo, recup\u00e9relo por s\u00ed mismo de una manera m\u00e1s segura para ----truncado---"
          }
        ],
        "id": "CVE-2024-49934",
        "lastModified": "2026-08-04T11:20:59.133",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "PHYSICAL",
                "availabilityImpact": "HIGH",
                "baseScore": 4.6,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 0.9,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-49934",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:38:39.445288Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-10-21T18:15:15.273",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1a4159138e718db6199f0abf376ad52f726dcc5c"
          },
          {
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            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7f7b850689ac06a62befe26e1fd1806799e7f152"
          },
          {
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            "url": "https://git.kernel.org/stable/c/e0f6ee75f50476607ca82fc7c3711c795ce09b52"
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          {
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/f92b8829c6e75632de4e2b9f70e7a7e6c5c2ba98"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T15:30:25+00:00",
      "cve": "CVE-2024-49934",
      "id": "CVE-2024-49934",
      "initial_release_date": "2024-10-21T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49934.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T20:42:09.370Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-49934",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-10-22T13:38:39.445288Z",
                    "version": "2.0.3"
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                  "type": "ssvc"
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              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-10-22T13:38:43.438Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/inode.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "versionType": "git"
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                {
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                {
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                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/inode.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.0"
                },
                {
                  "lessThan": "5.0",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.120",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.64",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.10.*",
                  "status": "unaffected",
                  "version": "6.10.14",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.11.*",
                  "status": "unaffected",
                  "version": "6.11.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.12",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.120",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.64",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10.14",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.11.3",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12",
                      "versionStartIncluding": "5.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name\n\nIt\u0027s observed that a crash occurs during hot-remove a memory device,\nin which user is accessing the hugetlb. See calltrace as following:\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 14045 at arch/x86/mm/fault.c:1278 do_user_addr_fault+0x2a0/0x790\nModules linked in: kmem device_dax cxl_mem cxl_pmem cxl_port cxl_pci dax_hmem dax_pmem nd_pmem cxl_acpi nd_btt cxl_core crc32c_intel nvme virtiofs fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc s\nmirror dm_region_hash dm_log dm_mod\nCPU: 1 PID: 14045 Comm: daxctl Not tainted 6.10.0-rc2-lizhijian+ #492\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\nRIP: 0010:do_user_addr_fault+0x2a0/0x790\nCode: 48 8b 00 a8 04 0f 84 b5 fe ff ff e9 1c ff ff ff 4c 89 e9 4c 89 e2 be 01 00 00 00 bf 02 00 00 00 e8 b5 ef 24 00 e9 42 fe ff ff \u003c0f\u003e 0b 48 83 c4 08 4c 89 ea 48 89 ee 4c 89 e7 5b 5d 41 5c 41 5d 41\nRSP: 0000:ffffc90000a575f0 EFLAGS: 00010046\nRAX: ffff88800c303600 RBX: 0000000000000000 RCX: 0000000000000000\nRDX: 0000000000001000 RSI: ffffffff82504162 RDI: ffffffff824b2c36\nRBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000a57658\nR13: 0000000000001000 R14: ffff88800bc2e040 R15: 0000000000000000\nFS:  00007f51cb57d880(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000001000 CR3: 00000000072e2004 CR4: 00000000001706f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n ? __warn+0x8d/0x190\n ? do_user_addr_fault+0x2a0/0x790\n ? report_bug+0x1c3/0x1d0\n ? handle_bug+0x3c/0x70\n ? exc_invalid_op+0x14/0x70\n ? asm_exc_invalid_op+0x16/0x20\n ? do_user_addr_fault+0x2a0/0x790\n ? exc_page_fault+0x31/0x200\n exc_page_fault+0x68/0x200\n\u003c...snip...\u003e\nBUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n ---[ end trace 0000000000000000 ]---\n BUG: unable to handle page fault for address: 0000000000001000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 800000000ad92067 P4D 800000000ad92067 PUD 7677067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 14045 Comm: daxctl Kdump: loaded Tainted: G        W          6.10.0-rc2-lizhijian+ #492\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n RIP: 0010:dentry_name+0x1f4/0x440\n\u003c...snip...\u003e\n? dentry_name+0x2fa/0x440\nvsnprintf+0x1f3/0x4f0\nvprintk_store+0x23a/0x540\nvprintk_emit+0x6d/0x330\n_printk+0x58/0x80\ndump_mapping+0x10b/0x1a0\n? __pfx_free_object_rcu+0x10/0x10\n__dump_page+0x26b/0x3e0\n? vprintk_emit+0xe0/0x330\n? _printk+0x58/0x80\n? dump_page+0x17/0x50\ndump_page+0x17/0x50\ndo_migrate_range+0x2f7/0x7f0\n? do_migrate_range+0x42/0x7f0\n? offline_pages+0x2f4/0x8c0\noffline_pages+0x60a/0x8c0\nmemory_subsys_offline+0x9f/0x1c0\n? lockdep_hardirqs_on+0x77/0x100\n? _raw_spin_unlock_irqrestore+0x38/0x60\ndevice_offline+0xe3/0x110\nstate_store+0x6e/0xc0\nkernfs_fop_write_iter+0x143/0x200\nvfs_write+0x39f/0x560\nksys_write+0x65/0xf0\ndo_syscall_64+0x62/0x130\n\nPreviously, some sanity check have been done in dump_mapping() before\nthe print facility parsing \u0027%pd\u0027 though, it\u0027s still possible to run into\nan invalid dentry.d_name.name.\n\nSince dump_mapping() only needs to dump the filename only, retrieve it\nby itself in a safer way to prevent an unnecessary crash.\n\nNote that either retrieving the filename with \u0027%pd\u0027 or\nstrncpy_from_kernel_nofault(), the filename could be unreliable."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-01-05T10:54:27.666Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/1a4159138e718db6199f0abf376ad52f726dcc5c"
            },
            {
              "url": "https://git.kernel.org/stable/c/e0f6ee75f50476607ca82fc7c3711c795ce09b52"
            },
            {
              "url": "https://git.kernel.org/stable/c/f92b8829c6e75632de4e2b9f70e7a7e6c5c2ba98"
            },
            {
              "url": "https://git.kernel.org/stable/c/ef921bc72328b577cb45772ff7921cba4773b74a"
            },
            {
              "url": "https://git.kernel.org/stable/c/7f7b850689ac06a62befe26e1fd1806799e7f152"
            }
          ],
          "title": "fs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-49934",
        "datePublished": "2024-10-21T18:01:55.752Z",
        "dateReserved": "2024-10-21T12:17:06.040Z",
        "dateUpdated": "2026-01-05T10:54:27.666Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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