CVE-2023-53846 (GCVE-0-2023-53846)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:30 – Updated: 2026-08-05 09:16
VLAI
Title
f2fs: fix to do sanity check on direct node in truncate_dnode()
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on direct node in truncate_dnode() syzbot reports below bug: BUG: KASAN: slab-use-after-free in f2fs_truncate_data_blocks_range+0x122a/0x14c0 fs/f2fs/file.c:574 Read of size 4 at addr ffff88802a25c000 by task syz-executor148/5000 CPU: 1 PID: 5000 Comm: syz-executor148 Not tainted 6.4.0-rc7-syzkaller-00041-ge660abd551f1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 f2fs_truncate_data_blocks_range+0x122a/0x14c0 fs/f2fs/file.c:574 truncate_dnode+0x229/0x2e0 fs/f2fs/node.c:944 f2fs_truncate_inode_blocks+0x64b/0xde0 fs/f2fs/node.c:1154 f2fs_do_truncate_blocks+0x4ac/0xf30 fs/f2fs/file.c:721 f2fs_truncate_blocks+0x7b/0x300 fs/f2fs/file.c:749 f2fs_truncate.part.0+0x4a5/0x630 fs/f2fs/file.c:799 f2fs_truncate include/linux/fs.h:825 [inline] f2fs_setattr+0x1738/0x2090 fs/f2fs/file.c:1006 notify_change+0xb2c/0x1180 fs/attr.c:483 do_truncate+0x143/0x200 fs/open.c:66 handle_truncate fs/namei.c:3295 [inline] do_open fs/namei.c:3640 [inline] path_openat+0x2083/0x2750 fs/namei.c:3791 do_filp_open+0x1ba/0x410 fs/namei.c:3818 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_creat fs/open.c:1448 [inline] __se_sys_creat fs/open.c:1442 [inline] __x64_sys_creat+0xcd/0x120 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The root cause is, inodeA references inodeB via inodeB's ino, once inodeA is truncated, it calls truncate_dnode() to truncate data blocks in inodeB's node page, it traverse mapping data from node->i.i_addr[0] to node->i.i_addr[ADDRS_PER_BLOCK() - 1], result in out-of-boundary access. This patch fixes to add sanity check on dnode page in truncate_dnode(), so that, it can help to avoid triggering such issue, and once it encounters such issue, it will record newly introduced ERROR_INVALID_NODE_REFERENCE error into superblock, later fsck can detect such issue and try repairing. Also, it removes f2fs_truncate_data_blocks() for cleanup due to the function has only one caller, and uses f2fs_truncate_data_blocks_range() instead.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < af0f716ad3b039cab9d426da63a5ee6c88751185 (git)
Affected: 98e4da8ca301e062d79ae168c67e56f3c3de3ce4 , < a6ec83786ab9f13f25fb18166dee908845713a95 (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 6.4.10 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/f2fs.h",
            "fs/f2fs/file.c",
            "fs/f2fs/node.c",
            "include/linux/f2fs_fs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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            "fs/f2fs/file.c",
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          "versions": [
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              "version": "6.4.10",
              "versionType": "semver"
            },
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
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      "cpeApplicability": [
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                  "versionStartIncluding": "3.8",
                  "vulnerable": true
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on direct node in truncate_dnode()\n\nsyzbot reports below bug:\n\nBUG: KASAN: slab-use-after-free in f2fs_truncate_data_blocks_range+0x122a/0x14c0 fs/f2fs/file.c:574\nRead of size 4 at addr ffff88802a25c000 by task syz-executor148/5000\n\nCPU: 1 PID: 5000 Comm: syz-executor148 Not tainted 6.4.0-rc7-syzkaller-00041-ge660abd551f1 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106\n print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351\n print_report mm/kasan/report.c:462 [inline]\n kasan_report+0x11c/0x130 mm/kasan/report.c:572\n f2fs_truncate_data_blocks_range+0x122a/0x14c0 fs/f2fs/file.c:574\n truncate_dnode+0x229/0x2e0 fs/f2fs/node.c:944\n f2fs_truncate_inode_blocks+0x64b/0xde0 fs/f2fs/node.c:1154\n f2fs_do_truncate_blocks+0x4ac/0xf30 fs/f2fs/file.c:721\n f2fs_truncate_blocks+0x7b/0x300 fs/f2fs/file.c:749\n f2fs_truncate.part.0+0x4a5/0x630 fs/f2fs/file.c:799\n f2fs_truncate include/linux/fs.h:825 [inline]\n f2fs_setattr+0x1738/0x2090 fs/f2fs/file.c:1006\n notify_change+0xb2c/0x1180 fs/attr.c:483\n do_truncate+0x143/0x200 fs/open.c:66\n handle_truncate fs/namei.c:3295 [inline]\n do_open fs/namei.c:3640 [inline]\n path_openat+0x2083/0x2750 fs/namei.c:3791\n do_filp_open+0x1ba/0x410 fs/namei.c:3818\n do_sys_openat2+0x16d/0x4c0 fs/open.c:1356\n do_sys_open fs/open.c:1372 [inline]\n __do_sys_creat fs/open.c:1448 [inline]\n __se_sys_creat fs/open.c:1442 [inline]\n __x64_sys_creat+0xcd/0x120 fs/open.c:1442\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root cause is, inodeA references inodeB via inodeB\u0027s ino, once inodeA\nis truncated, it calls truncate_dnode() to truncate data blocks in inodeB\u0027s\nnode page, it traverse mapping data from node-\u003ei.i_addr[0] to\nnode-\u003ei.i_addr[ADDRS_PER_BLOCK() - 1], result in out-of-boundary access.\n\nThis patch fixes to add sanity check on dnode page in truncate_dnode(),\nso that, it can help to avoid triggering such issue, and once it encounters\nsuch issue, it will record newly introduced ERROR_INVALID_NODE_REFERENCE\nerror into superblock, later fsck can detect such issue and try repairing.\n\nAlso, it removes f2fs_truncate_data_blocks() for cleanup due to the\nfunction has only one caller, and uses f2fs_truncate_data_blocks_range()\ninstead."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached through local syscalls (`creat`/`truncate`/`ftruncate`) on a file in a mounted f2fs image; there is no network-facing path into `truncate_dnode()`. Attack requires local system access to mount the crafted image and operate on it.\nAC:L - The corrupted node reference is fully attacker-controlled on-disk data, and syzbot has a deterministic reproducer \u2014 a single truncate on the crafted inode reliably drives the loop past the end of the inode page. No race or uncontrollable state is involved.\nPR:L - An unprivileged local user can get an arbitrary f2fs image mounted on common deployments (udisks2/systemd-mount removable-media policy for active sessions, Android vold adoptable storage), and triggering the truncate afterward needs only ordinary write access to a file. No root in the initial namespace is required in these configurations.\nUI:N - The same unprivileged attacker performs both the mount (via the removable-media auto-mount path) and the truncate syscall; no separate victim action is needed once the image is attached.\nS:U - The out-of-bounds access and any resulting corruption stay within the kernel\u0027s own security authority \u2014 this is a standard in-kernel memory-safety flaw with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The loop performs an out-of-bounds read of ~84 four-byte words past the end of the node page (KASAN reports it as slab-use-after-free), and those adjacent-page values are consumed as block addresses that get invalidated and reflected in the extent cache and block accounting, disclosing adjacent kernel heap contents.\nI:H - Every non-zero out-of-bounds word triggers `f2fs_set_data_blkaddr()` \u2192 `__set_data_blkaddr()`, writing a 4-byte zero through the same OOB pointer \u2014 an out-of-bounds write into the neighbouring physical page, plus corruption of SIT/valid-block accounting and freeing of blocks belonging to other inodes.\nA:H - The out-of-bounds access reliably produces a KASAN slab-use-after-free splat and can panic the kernel, and the bogus block addresses and inflated free counts drive `f2fs_invalidate_blocks()`/`dec_valid_block_count()` into `f2fs_bug_on()` conditions."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:16:23.337Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/af0f716ad3b039cab9d426da63a5ee6c88751185"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6ec83786ab9f13f25fb18166dee908845713a95"
        }
      ],
      "title": "f2fs: fix to do sanity check on direct node in truncate_dnode()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53846",
    "datePublished": "2025-12-09T01:30:09.202Z",
    "dateReserved": "2025-12-09T01:27:17.827Z",
    "dateUpdated": "2026-08-05T09:16:23.337Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53846",
      "date": "2026-10-01",
      "epss": "0.0017",
      "percentile": "0.0575"
    },
    "nvd": {
      "cve": {
        "affected": [
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            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/f2fs/f2fs.h",
                  "fs/f2fs/file.c",
                  "fs/f2fs/node.c",
                  "include/linux/f2fs_fs.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
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                  "fs/f2fs/file.c",
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                  "include/linux/f2fs_fs.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "3.8"
                  },
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                    "version": "0",
                    "versionType": "semver"
                  },
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                    "version": "6.4.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.5",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on direct node in truncate_dnode()\n\nsyzbot reports below bug:\n\nBUG: KASAN: slab-use-after-free in f2fs_truncate_data_blocks_range+0x122a/0x14c0 fs/f2fs/file.c:574\nRead of size 4 at addr ffff88802a25c000 by task syz-executor148/5000\n\nCPU: 1 PID: 5000 Comm: syz-executor148 Not tainted 6.4.0-rc7-syzkaller-00041-ge660abd551f1 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106\n print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351\n print_report mm/kasan/report.c:462 [inline]\n kasan_report+0x11c/0x130 mm/kasan/report.c:572\n f2fs_truncate_data_blocks_range+0x122a/0x14c0 fs/f2fs/file.c:574\n truncate_dnode+0x229/0x2e0 fs/f2fs/node.c:944\n f2fs_truncate_inode_blocks+0x64b/0xde0 fs/f2fs/node.c:1154\n f2fs_do_truncate_blocks+0x4ac/0xf30 fs/f2fs/file.c:721\n f2fs_truncate_blocks+0x7b/0x300 fs/f2fs/file.c:749\n f2fs_truncate.part.0+0x4a5/0x630 fs/f2fs/file.c:799\n f2fs_truncate include/linux/fs.h:825 [inline]\n f2fs_setattr+0x1738/0x2090 fs/f2fs/file.c:1006\n notify_change+0xb2c/0x1180 fs/attr.c:483\n do_truncate+0x143/0x200 fs/open.c:66\n handle_truncate fs/namei.c:3295 [inline]\n do_open fs/namei.c:3640 [inline]\n path_openat+0x2083/0x2750 fs/namei.c:3791\n do_filp_open+0x1ba/0x410 fs/namei.c:3818\n do_sys_openat2+0x16d/0x4c0 fs/open.c:1356\n do_sys_open fs/open.c:1372 [inline]\n __do_sys_creat fs/open.c:1448 [inline]\n __se_sys_creat fs/open.c:1442 [inline]\n __x64_sys_creat+0xcd/0x120 fs/open.c:1442\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root cause is, inodeA references inodeB via inodeB\u0027s ino, once inodeA\nis truncated, it calls truncate_dnode() to truncate data blocks in inodeB\u0027s\nnode page, it traverse mapping data from node-\u003ei.i_addr[0] to\nnode-\u003ei.i_addr[ADDRS_PER_BLOCK() - 1], result in out-of-boundary access.\n\nThis patch fixes to add sanity check on dnode page in truncate_dnode(),\nso that, it can help to avoid triggering such issue, and once it encounters\nsuch issue, it will record newly introduced ERROR_INVALID_NODE_REFERENCE\nerror into superblock, later fsck can detect such issue and try repairing.\n\nAlso, it removes f2fs_truncate_data_blocks() for cleanup due to the\nfunction has only one caller, and uses f2fs_truncate_data_blocks_range()\ninstead."
          }
        ],
        "id": "CVE-2023-53846",
        "lastModified": "2026-08-04T10:19:23.927",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2025-12-09T16:17:25.003",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a6ec83786ab9f13f25fb18166dee908845713a95"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/af0f716ad3b039cab9d426da63a5ee6c88751185"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:15:43+00:00",
      "cve": "CVE-2023-53846",
      "id": "CVE-2023-53846",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix to do sanity check on direct node in truncate_dnode()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53846.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T17:05:29Z",
      "cve": "CVE-2023-53846",
      "id": "CVE-2023-53846",
      "initial_release_date": "2025-12-10T00:34:46Z",
      "product_status:known_affected": "589",
      "product_status:known_not_affected": "237",
      "product_status:recommended": "212",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53846",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53846.json",
      "version": "31"
    }
  }
}



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