CVE-2026-63819 (GCVE-0-2026-63819)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
f2fs: fix to do sanity check on f2fs_get_node_folio_ra()
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on f2fs_get_node_folio_ra() kernel BUG at fs/f2fs/file.c:845! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:f2fs_do_truncate_blocks+0x1115/0x1140 fs/f2fs/file.c:845 Code: fc fc 90 0f 0b e8 8b 9d 9a fd 90 0f 0b e8 83 9d 9a fd 48 89 df 48 c7 c6 60 d1 1a 8c e8 54 f1 fc fc 90 0f 0b e8 6c 9d 9a fd 90 <0f> 0b e8 64 9d 9a fd 90 0f 0b 90 e9 93 fd ff ff e8 56 9d 9a fd 90 RSP: 0018:ffffc9000e4474c0 EFLAGS: 00010283 RAX: ffffffff842b1d34 RBX: 0000000000000003 RCX: 0000000000100000 RDX: ffffc9000f03a000 RSI: 0000000000035503 RDI: 0000000000035504 RBP: ffffc9000e447608 R08: ffff8880123b0000 R09: 0000000000000002 R10: 00000000fffffffe R11: 0000000000000002 R12: 0000000000000001 R13: 0000000000000000 R14: 1ffff92001c88ea0 R15: 00000000ffff039c FS: 00007f7e02ee36c0(0000) GS:ffff88808c887000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff0305c4000 CR3: 0000000012d4c000 CR4: 0000000000352ef0 Call Trace: <TASK> f2fs_truncate_blocks+0x10a/0x300 fs/f2fs/file.c:882 f2fs_truncate+0x471/0x7c0 fs/f2fs/file.c:940 f2fs_evict_inode+0xa3f/0x1ac0 fs/f2fs/inode.c:907 evict+0x61e/0xb10 fs/inode.c:841 f2fs_fill_super+0x5f43/0x78f0 fs/f2fs/super.c:5224 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694 vfs_get_tree+0x92/0x2a0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3758 [inline] do_new_mount+0x341/0xd30 fs/namespace.c:3834 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4360 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f count = ADDRS_PER_PAGE(dn.node_folio, inode); count -= dn.ofs_in_node; f2fs_bug_on(sbi, count < 0); The fuzz test will trigger above bug_on in f2fs. The root cause should be: in the corrupted inode, there is a direct node which has the same ino and nid in its footer, so in f2fs_do_truncate_blocks(), after f2fs_get_dnode_of_data() finds such dnode: 1) ADDRS_PER_PAGE(dn.node_folio, inode) will return 923 2) once dn.ofs_in_node points to addr[923, 1017] Then it will trigger the system panic. Let's introduce NODE_TYPE_NON_IXNODE to indicate current node should not be an inode or xattr node, and then use it in below path to detect inconsistent node chain in inode mapping table: - f2fs_do_truncate_blocks - f2fs_get_dnode_of_data - f2fs_get_node_folio_ra - __get_node_folio - f2fs_sanity_check_node_footer - case NODE_TYPE_NON_IXNODE -> check whether it is inode|xnode
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
Linux Linux Affected: e05df3b115e7308afbca652769b54e4549fcc723 , < 406c28af75123432d38cf9bbaa6f1476f7b14770 (git)
Affected: e05df3b115e7308afbca652769b54e4549fcc723 , < 0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73 (git)
Affected: e05df3b115e7308afbca652769b54e4549fcc723 , < 8712353ed80f87271d732297567dcdbe4b84e8c7 (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/f2fs.h",
            "fs/f2fs/node.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "406c28af75123432d38cf9bbaa6f1476f7b14770",
              "status": "affected",
              "version": "e05df3b115e7308afbca652769b54e4549fcc723",
              "versionType": "git"
            },
            {
              "lessThan": "0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73",
              "status": "affected",
              "version": "e05df3b115e7308afbca652769b54e4549fcc723",
              "versionType": "git"
            },
            {
              "lessThan": "8712353ed80f87271d732297567dcdbe4b84e8c7",
              "status": "affected",
              "version": "e05df3b115e7308afbca652769b54e4549fcc723",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/f2fs.h",
            "fs/f2fs/node.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on f2fs_get_node_folio_ra()\n\nkernel BUG at fs/f2fs/file.c:845!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nRIP: 0010:f2fs_do_truncate_blocks+0x1115/0x1140 fs/f2fs/file.c:845\nCode: fc fc 90 0f 0b e8 8b 9d 9a fd 90 0f 0b e8 83 9d 9a fd 48 89 df 48 c7 c6 60 d1 1a 8c e8 54 f1 fc fc 90 0f 0b e8 6c 9d 9a fd 90 \u003c0f\u003e 0b e8 64 9d 9a fd 90 0f 0b 90 e9 93 fd ff ff e8 56 9d 9a fd 90\nRSP: 0018:ffffc9000e4474c0 EFLAGS: 00010283\nRAX: ffffffff842b1d34 RBX: 0000000000000003 RCX: 0000000000100000\nRDX: ffffc9000f03a000 RSI: 0000000000035503 RDI: 0000000000035504\nRBP: ffffc9000e447608 R08: ffff8880123b0000 R09: 0000000000000002\nR10: 00000000fffffffe R11: 0000000000000002 R12: 0000000000000001\nR13: 0000000000000000 R14: 1ffff92001c88ea0 R15: 00000000ffff039c\nFS:  00007f7e02ee36c0(0000) GS:ffff88808c887000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ff0305c4000 CR3: 0000000012d4c000 CR4: 0000000000352ef0\nCall Trace:\n \u003cTASK\u003e\n f2fs_truncate_blocks+0x10a/0x300 fs/f2fs/file.c:882\n f2fs_truncate+0x471/0x7c0 fs/f2fs/file.c:940\n f2fs_evict_inode+0xa3f/0x1ac0 fs/f2fs/inode.c:907\n evict+0x61e/0xb10 fs/inode.c:841\n f2fs_fill_super+0x5f43/0x78f0 fs/f2fs/super.c:5224\n get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694\n vfs_get_tree+0x92/0x2a0 fs/super.c:1754\n fc_mount fs/namespace.c:1193 [inline]\n do_new_mount_fc fs/namespace.c:3758 [inline]\n do_new_mount+0x341/0xd30 fs/namespace.c:3834\n do_mount fs/namespace.c:4167 [inline]\n __do_sys_mount fs/namespace.c:4383 [inline]\n __se_sys_mount+0x31d/0x420 fs/namespace.c:4360\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n\tcount = ADDRS_PER_PAGE(dn.node_folio, inode);\n\n\tcount -= dn.ofs_in_node;\n\tf2fs_bug_on(sbi, count \u003c 0);\n\nThe fuzz test will trigger above bug_on in f2fs.\n\nThe root cause should be: in the corrupted inode, there is a direct node\nwhich has the same ino and nid in its footer, so in f2fs_do_truncate_blocks(),\nafter f2fs_get_dnode_of_data() finds such dnode:\n1) ADDRS_PER_PAGE(dn.node_folio, inode) will return 923\n2) once dn.ofs_in_node points to addr[923, 1017]\nThen it will trigger the system panic.\n\nLet\u0027s introduce NODE_TYPE_NON_IXNODE to indicate current node should\nnot be an inode or xattr node, and then use it in below path to detect\ninconsistent node chain in inode mapping table:\n\n- f2fs_do_truncate_blocks\n - f2fs_get_dnode_of_data\n  - f2fs_get_node_folio_ra\n   -  __get_node_folio\n    - f2fs_sanity_check_node_footer\n     - case NODE_TYPE_NON_IXNODE -\u003e check whether it is inode|xnode"
        }
      ],
      "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:40:26.536Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/406c28af75123432d38cf9bbaa6f1476f7b14770"
        },
        {
          "url": "https://git.kernel.org/stable/c/0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73"
        },
        {
          "url": "https://git.kernel.org/stable/c/8712353ed80f87271d732297567dcdbe4b84e8c7"
        }
      ],
      "title": "f2fs: fix to do sanity check on f2fs_get_node_folio_ra()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63819",
    "datePublished": "2026-07-19T12:02:17.613Z",
    "dateReserved": "2026-07-19T07:54:57.014Z",
    "dateUpdated": "2026-07-20T13:40:26.536Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63819",
      "date": "2026-07-21",
      "epss": "0.00119",
      "percentile": "0.02056"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:41:29.000Z",
      "cve": "CVE-2026-63819",
      "id": "msrc_CVE-2026-63819",
      "initial_release_date": "2026-07-20T01:02:08.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "f2fs: fix to do sanity check on f2fs_get_node_folio_ra()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63819.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63819\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:54.980\",\"lastModified\":\"2026-07-20T15:16:48.823\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix to do sanity check on f2fs_get_node_folio_ra()\\n\\nkernel BUG at fs/f2fs/file.c:845!\\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\nRIP: 0010:f2fs_do_truncate_blocks+0x1115/0x1140 fs/f2fs/file.c:845\\nCode: fc fc 90 0f 0b e8 8b 9d 9a fd 90 0f 0b e8 83 9d 9a fd 48 89 df 48 c7 c6 60 d1 1a 8c e8 54 f1 fc fc 90 0f 0b e8 6c 9d 9a fd 90 \u003c0f\u003e 0b e8 64 9d 9a fd 90 0f 0b 90 e9 93 fd ff ff e8 56 9d 9a fd 90\\nRSP: 0018:ffffc9000e4474c0 EFLAGS: 00010283\\nRAX: ffffffff842b1d34 RBX: 0000000000000003 RCX: 0000000000100000\\nRDX: ffffc9000f03a000 RSI: 0000000000035503 RDI: 0000000000035504\\nRBP: ffffc9000e447608 R08: ffff8880123b0000 R09: 0000000000000002\\nR10: 00000000fffffffe R11: 0000000000000002 R12: 0000000000000001\\nR13: 0000000000000000 R14: 1ffff92001c88ea0 R15: 00000000ffff039c\\nFS:  00007f7e02ee36c0(0000) GS:ffff88808c887000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00007ff0305c4000 CR3: 0000000012d4c000 CR4: 0000000000352ef0\\nCall Trace:\\n \u003cTASK\u003e\\n f2fs_truncate_blocks+0x10a/0x300 fs/f2fs/file.c:882\\n f2fs_truncate+0x471/0x7c0 fs/f2fs/file.c:940\\n f2fs_evict_inode+0xa3f/0x1ac0 fs/f2fs/inode.c:907\\n evict+0x61e/0xb10 fs/inode.c:841\\n f2fs_fill_super+0x5f43/0x78f0 fs/f2fs/super.c:5224\\n get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694\\n vfs_get_tree+0x92/0x2a0 fs/super.c:1754\\n fc_mount fs/namespace.c:1193 [inline]\\n do_new_mount_fc fs/namespace.c:3758 [inline]\\n do_new_mount+0x341/0xd30 fs/namespace.c:3834\\n do_mount fs/namespace.c:4167 [inline]\\n __do_sys_mount fs/namespace.c:4383 [inline]\\n __se_sys_mount+0x31d/0x420 fs/namespace.c:4360\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\n\\tcount = ADDRS_PER_PAGE(dn.node_folio, inode);\\n\\n\\tcount -= dn.ofs_in_node;\\n\\tf2fs_bug_on(sbi, count \u003c 0);\\n\\nThe fuzz test will trigger above bug_on in f2fs.\\n\\nThe root cause should be: in the corrupted inode, there is a direct node\\nwhich has the same ino and nid in its footer, so in f2fs_do_truncate_blocks(),\\nafter f2fs_get_dnode_of_data() finds such dnode:\\n1) ADDRS_PER_PAGE(dn.node_folio, inode) will return 923\\n2) once dn.ofs_in_node points to addr[923, 1017]\\nThen it will trigger the system panic.\\n\\nLet\u0027s introduce NODE_TYPE_NON_IXNODE to indicate current node should\\nnot be an inode or xattr node, and then use it in below path to detect\\ninconsistent node chain in inode mapping table:\\n\\n- f2fs_do_truncate_blocks\\n - f2fs_get_dnode_of_data\\n  - f2fs_get_node_folio_ra\\n   -  __get_node_folio\\n    - f2fs_sanity_check_node_footer\\n     - case NODE_TYPE_NON_IXNODE -\u003e check whether it is inode|xnode\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/f2fs/f2fs.h\",\"fs/f2fs/node.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e05df3b115e7308afbca652769b54e4549fcc723\",\"lessThan\":\"406c28af75123432d38cf9bbaa6f1476f7b14770\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e05df3b115e7308afbca652769b54e4549fcc723\",\"lessThan\":\"0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e05df3b115e7308afbca652769b54e4549fcc723\",\"lessThan\":\"8712353ed80f87271d732297567dcdbe4b84e8c7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/f2fs/f2fs.h\",\"fs/f2fs/node.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0cc21c1ffe15b4156b0bf744f32fd1faef0b7c73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/406c28af75123432d38cf9bbaa6f1476f7b14770\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8712353ed80f87271d732297567dcdbe4b84e8c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:01:32+00:00",
      "cve": "CVE-2026-63819",
      "id": "CVE-2026-63819",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix to do sanity check on f2fs_get_node_folio_ra()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63819.json",
      "version": "3"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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