CVE-2024-44939 (GCVE-0-2024-44939)

Vulnerability from cvelistv5 – Published: 2024-08-26 11:20 – Updated: 2026-08-05 11:37
VLAI
Title
jfs: fix null ptr deref in dtInsertEntry
Summary
In the Linux kernel, the following vulnerability has been resolved: jfs: fix null ptr deref in dtInsertEntry [syzbot reported] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 5061 Comm: syz-executor404 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713 ... [Analyze] In dtInsertEntry(), when the pointer h has the same value as p, after writing name in UniStrncpy_to_le(), p->header.flag will be cleared. This will cause the previously true judgment "p->header.flag & BT-LEAF" to change to no after writing the name operation, this leads to entering an incorrect branch and accessing the uninitialized object ih when judging this condition for the second time. [Fix] After got the page, check freelist first, if freelist == 0 then exit dtInsert() and return -EINVAL.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:27 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f98bf80b20f4a930589cda48a35f751a64fe0dc2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 53023ab11836ac56fd75f7a71ec1356e50920fa9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6ea10dbb1e6c58384136e9adfd75f81951e423f6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9c2ac38530d1a3ee558834dfa16c85a40fd0e702 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ce6dede912f064a855acf6f04a04cbb2c25b8c8c (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.107 , ≤ 6.1.* (semver)
Unaffected: 6.6.47 , ≤ 6.6.* (semver)
Unaffected: 6.10.6 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix null ptr deref in dtInsertEntry\n\n[syzbot reported]\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nCPU: 0 PID: 5061 Comm: syz-executor404 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nRIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713\n...\n[Analyze]\nIn dtInsertEntry(), when the pointer h has the same value as p, after writing\nname in UniStrncpy_to_le(), p-\u003eheader.flag will be cleared. This will cause the\npreviously true judgment \"p-\u003eheader.flag \u0026 BT-LEAF\" to change to no after writing\nthe name operation, this leads to entering an incorrect branch and accessing the\nuninitialized object ih when judging this condition for the second time.\n\n[Fix]\nAfter got the page, check freelist first, if freelist == 0 then exit dtInsert()\nand return -EINVAL."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: jfs: corrige null ptr deref en dtInsertEntry [syzbot inform\u00f3] falla de protecci\u00f3n general, probablemente para direcci\u00f3n no can\u00f3nica 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr -deref en rango [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 5061 Comm: syz-executor404 No contaminado 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Nombre de hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 03 /27 /2024 RIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713 ... [Analizar] En dtInsertEntry(), cuando el puntero h tiene el mismo valor que p, despu\u00e9s de escribir el nombre en UniStrncpy_to_le(), Se borrar\u00e1 p-\u0026gt;header.flag. Esto har\u00e1 que el juicio previamente verdadero \"p-\u0026gt;header.flag \u0026amp; BT-LEAF\" cambie a no despu\u00e9s de escribir la operaci\u00f3n de nombre, esto lleva a ingresar una rama incorrecta y acceder al objeto no inicializado ih al juzgar esta condici\u00f3n por segunda vez. [Soluci\u00f3n] Despu\u00e9s de obtener la p\u00e1gina, verifique primero la lista libre, si lista libre == 0, salga de dtInsert() y devuelva -EINVAL."
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            "url": "https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ce6dede912f064a855acf6f04a04cbb2c25b8c8c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f98bf80b20f4a930589cda48a35f751a64fe0dc2"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:42:19+00:00",
      "cve": "CVE-2024-44939",
      "id": "CVE-2024-44939",
      "initial_release_date": "2024-08-26T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: jfs: fix null ptr deref in dtInsertEntry",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-44939.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T22:13:44.114Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-44939",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:27:35.487089Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:14.872Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/jfs/jfs_dtree.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "f98bf80b20f4a930589cda48a35f751a64fe0dc2",
                  "status": "affected",
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                  "versionType": "git"
                },
                {
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                  "status": "affected",
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                  "versionType": "git"
                },
                {
                  "lessThan": "6ea10dbb1e6c58384136e9adfd75f81951e423f6",
                  "status": "affected",
                  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                  "versionType": "git"
                },
                {
                  "lessThan": "9c2ac38530d1a3ee558834dfa16c85a40fd0e702",
                  "status": "affected",
                  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
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                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/jfs/jfs_dtree.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "2.6.12"
                },
                {
                  "lessThan": "2.6.12",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.189",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.107",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.47",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.10.*",
                  "status": "unaffected",
                  "version": "6.10.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.11",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.189",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.107",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.47",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10.6",
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                      "vulnerable": true
                    },
                    {
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                      "versionEndExcluding": "6.11",
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                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix null ptr deref in dtInsertEntry\n\n[syzbot reported]\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nCPU: 0 PID: 5061 Comm: syz-executor404 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\nRIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713\n...\n[Analyze]\nIn dtInsertEntry(), when the pointer h has the same value as p, after writing\nname in UniStrncpy_to_le(), p-\u003eheader.flag will be cleared. This will cause the\npreviously true judgment \"p-\u003eheader.flag \u0026 BT-LEAF\" to change to no after writing\nthe name operation, this leads to entering an incorrect branch and accessing the\nuninitialized object ih when judging this condition for the second time.\n\n[Fix]\nAfter got the page, check freelist first, if freelist == 0 then exit dtInsert()\nand return -EINVAL."
            }
          ],
          "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 vulnerable path is reached only through local directory-modifying syscalls (creat/mkdir/link/symlink/mknod/rename) on a mounted JFS volume; there is no network-facing consumer of jfs_dtree.c.\nAC:L - Fully deterministic \u2014 a directory page crafted with header.freelist==0 and freecnt\u003e=1 passes the era\u0027s DT_GETPAGE sanity checks, and a single file creation with an attacker-chosen name reliably reaches the aliased slot[0] write; no race and no memory-layout dependency.\nPR:L - Any unprivileged local user with write access to a directory on the mounted crafted volume triggers it via an ordinary creat()/mkdir(); dtInsert() performs no capability or credential check on the path from jfs_create()/jfs_mkdir().\nUI:N - Once the untrusted JFS volume is mounted (kiosk/shared removable media automount, admin-mounted image, or a container/VM handed a JFS disk), the attacker triggers the bug entirely on their own with a single syscall \u2014 no victim action at attack time.\nS:U - The corruption and crash are confined to the kernel\u0027s own memory and the JFS metadata it manages; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - The overwritten header leaves stblindex/maxslot/nextindex and the self PXD attacker-controlled, so subsequent p-\u003eslot[stbl[i]] and p-\u003eslot[next] accesses in dtSearch/jfs_readdir read out of bounds and return adjacent kernel heap bytes \u2014 and arbitrary disk blocks via the poisoned self PXD fed to add_index() \u2014 to userspace as dirent names and inode numbers.\nI:H - Attacker-chosen bytes (inode number, UTF-16LE filename, dir index) are written over the dtree page header, which is already dirtied and linelocked so the corruption is journaled to disk, and the resulting attacker-controlled s8 slot indices yield out-of-bounds heap writes on this and subsequent directory operations.\nA:H - The reported and readily reproduced outcome is a general protection fault writing to NULL+8 in dtInsertEntry(), an immediate kernel oops; the corrupted directory page also causes further faults on later access."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:37:08.416Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/f98bf80b20f4a930589cda48a35f751a64fe0dc2"
            },
            {
              "url": "https://git.kernel.org/stable/c/53023ab11836ac56fd75f7a71ec1356e50920fa9"
            },
            {
              "url": "https://git.kernel.org/stable/c/6ea10dbb1e6c58384136e9adfd75f81951e423f6"
            },
            {
              "url": "https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702"
            },
            {
              "url": "https://git.kernel.org/stable/c/ce6dede912f064a855acf6f04a04cbb2c25b8c8c"
            }
          ],
          "title": "jfs: fix null ptr deref in dtInsertEntry",
          "x_generator": {
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          }
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-44939",
        "datePublished": "2024-08-26T11:20:44.129Z",
        "dateReserved": "2024-08-21T05:34:56.664Z",
        "dateUpdated": "2026-08-05T11:37:08.416Z",
        "state": "PUBLISHED"
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.