CVE-2025-40246 (GCVE-0-2025-40246)

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2026-05-11 21:45
VLAI
Title
xfs: fix out of bounds memory read error in symlink repair
Summary
In the Linux kernel, the following vulnerability has been resolved: xfs: fix out of bounds memory read error in symlink repair xfs/286 produced this report on my test fleet: ================================================================== BUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110 Out-of-bounds read at 0xffff88843fe9e038 (184B right of kfence-#184): memcpy_orig+0x54/0x110 xrep_symlink_salvage_inline+0xb3/0xf0 [xfs] xrep_symlink_salvage+0x100/0x110 [xfs] xrep_symlink+0x2e/0x80 [xfs] xrep_attempt+0x61/0x1f0 [xfs] xfs_scrub_metadata+0x34f/0x5c0 [xfs] xfs_ioc_scrubv_metadata+0x387/0x560 [xfs] xfs_file_ioctl+0xe23/0x10e0 [xfs] __x64_sys_ioctl+0x76/0xc0 do_syscall_64+0x4e/0x1e0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 kfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, size=107, cache=kmalloc-128 allocated by task 3470 on cpu 1 at 263329.131592s (192823.508886s ago): xfs_init_local_fork+0x79/0xe0 [xfs] xfs_iformat_local+0xa4/0x170 [xfs] xfs_iformat_data_fork+0x148/0x180 [xfs] xfs_inode_from_disk+0x2cd/0x480 [xfs] xfs_iget+0x450/0xd60 [xfs] xfs_bulkstat_one_int+0x6b/0x510 [xfs] xfs_bulkstat_iwalk+0x1e/0x30 [xfs] xfs_iwalk_ag_recs+0xdf/0x150 [xfs] xfs_iwalk_run_callbacks+0xb9/0x190 [xfs] xfs_iwalk_ag+0x1dc/0x2f0 [xfs] xfs_iwalk_args.constprop.0+0x6a/0x120 [xfs] xfs_iwalk+0xa4/0xd0 [xfs] xfs_bulkstat+0xfa/0x170 [xfs] xfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs] xfs_file_ioctl+0xbf2/0x10e0 [xfs] __x64_sys_ioctl+0x76/0xc0 do_syscall_64+0x4e/0x1e0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 CPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub Not tainted 6.18.0-rc4-djwx #rc4 PREEMPT(lazy) 3d744dd94e92690f00a04398d2bd8631dcef1954 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014 ================================================================== On further analysis, I realized that the second parameter to min() is not correct. xfs_ifork::if_bytes is the size of the xfs_ifork::if_data buffer. if_bytes can be smaller than the data fork size because: (a) the forkoff code tries to keep the data area as large as possible (b) for symbolic links, if_bytes is the ondisk file size + 1 (c) forkoff is always a multiple of 8. Case in point: for a single-byte symlink target, forkoff will be 8 but the buffer will only be 2 bytes long. In other words, the logic here is wrong and we walk off the end of the incore buffer. Fix that.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2651923d8d8db00a57665822f017fa7c76758044 , < 7c2d68e091584149fe89bcbaf9b99b3162d46ee7 (git)
Affected: 2651923d8d8db00a57665822f017fa7c76758044 , < 81a8685cac4bf081c93a7df591644f4f80240bb9 (git)
Affected: 2651923d8d8db00a57665822f017fa7c76758044 , < 678e1cc2f482e0985a0613ab4a5bf89c497e5acc (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.60 , ≤ 6.12.* (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix out of bounds memory read error in symlink repair\n\nxfs/286 produced this report on my test fleet:\n\n ==================================================================\n BUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110\n\n Out-of-bounds read at 0xffff88843fe9e038 (184B right of kfence-#184):\n  memcpy_orig+0x54/0x110\n  xrep_symlink_salvage_inline+0xb3/0xf0 [xfs]\n  xrep_symlink_salvage+0x100/0x110 [xfs]\n  xrep_symlink+0x2e/0x80 [xfs]\n  xrep_attempt+0x61/0x1f0 [xfs]\n  xfs_scrub_metadata+0x34f/0x5c0 [xfs]\n  xfs_ioc_scrubv_metadata+0x387/0x560 [xfs]\n  xfs_file_ioctl+0xe23/0x10e0 [xfs]\n  __x64_sys_ioctl+0x76/0xc0\n  do_syscall_64+0x4e/0x1e0\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n kfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, size=107, cache=kmalloc-128\n\n allocated by task 3470 on cpu 1 at 263329.131592s (192823.508886s ago):\n  xfs_init_local_fork+0x79/0xe0 [xfs]\n  xfs_iformat_local+0xa4/0x170 [xfs]\n  xfs_iformat_data_fork+0x148/0x180 [xfs]\n  xfs_inode_from_disk+0x2cd/0x480 [xfs]\n  xfs_iget+0x450/0xd60 [xfs]\n  xfs_bulkstat_one_int+0x6b/0x510 [xfs]\n  xfs_bulkstat_iwalk+0x1e/0x30 [xfs]\n  xfs_iwalk_ag_recs+0xdf/0x150 [xfs]\n  xfs_iwalk_run_callbacks+0xb9/0x190 [xfs]\n  xfs_iwalk_ag+0x1dc/0x2f0 [xfs]\n  xfs_iwalk_args.constprop.0+0x6a/0x120 [xfs]\n  xfs_iwalk+0xa4/0xd0 [xfs]\n  xfs_bulkstat+0xfa/0x170 [xfs]\n  xfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs]\n  xfs_file_ioctl+0xbf2/0x10e0 [xfs]\n  __x64_sys_ioctl+0x76/0xc0\n  do_syscall_64+0x4e/0x1e0\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n CPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub Not tainted 6.18.0-rc4-djwx #rc4 PREEMPT(lazy)  3d744dd94e92690f00a04398d2bd8631dcef1954\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014\n ==================================================================\n\nOn further analysis, I realized that the second parameter to min() is\nnot correct.  xfs_ifork::if_bytes is the size of the xfs_ifork::if_data\nbuffer.  if_bytes can be smaller than the data fork size because:\n\n(a) the forkoff code tries to keep the data area as large as possible\n(b) for symbolic links, if_bytes is the ondisk file size + 1\n(c) forkoff is always a multiple of 8.\n\nCase in point: for a single-byte symlink target, forkoff will be\n8 but the buffer will only be 2 bytes long.\n\nIn other words, the logic here is wrong and we walk off the end of the\nincore buffer.  Fix that."
        }
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        "dateUpdated": "2026-05-11T21:45:37.260Z",
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          "url": "https://git.kernel.org/stable/c/678e1cc2f482e0985a0613ab4a5bf89c497e5acc"
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      "title": "xfs: fix out of bounds memory read error in symlink repair",
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    "dateReserved": "2025-04-16T07:20:57.181Z",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix out of bounds memory read error in symlink repair\n\nxfs/286 produced this report on my test fleet:\n\n ==================================================================\n BUG: KFENCE: out-of-bounds read in memcpy_orig+0x54/0x110\n\n Out-of-bounds read at 0xffff88843fe9e038 (184B right of kfence-#184):\n  memcpy_orig+0x54/0x110\n  xrep_symlink_salvage_inline+0xb3/0xf0 [xfs]\n  xrep_symlink_salvage+0x100/0x110 [xfs]\n  xrep_symlink+0x2e/0x80 [xfs]\n  xrep_attempt+0x61/0x1f0 [xfs]\n  xfs_scrub_metadata+0x34f/0x5c0 [xfs]\n  xfs_ioc_scrubv_metadata+0x387/0x560 [xfs]\n  xfs_file_ioctl+0xe23/0x10e0 [xfs]\n  __x64_sys_ioctl+0x76/0xc0\n  do_syscall_64+0x4e/0x1e0\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n kfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, size=107, cache=kmalloc-128\n\n allocated by task 3470 on cpu 1 at 263329.131592s (192823.508886s ago):\n  xfs_init_local_fork+0x79/0xe0 [xfs]\n  xfs_iformat_local+0xa4/0x170 [xfs]\n  xfs_iformat_data_fork+0x148/0x180 [xfs]\n  xfs_inode_from_disk+0x2cd/0x480 [xfs]\n  xfs_iget+0x450/0xd60 [xfs]\n  xfs_bulkstat_one_int+0x6b/0x510 [xfs]\n  xfs_bulkstat_iwalk+0x1e/0x30 [xfs]\n  xfs_iwalk_ag_recs+0xdf/0x150 [xfs]\n  xfs_iwalk_run_callbacks+0xb9/0x190 [xfs]\n  xfs_iwalk_ag+0x1dc/0x2f0 [xfs]\n  xfs_iwalk_args.constprop.0+0x6a/0x120 [xfs]\n  xfs_iwalk+0xa4/0xd0 [xfs]\n  xfs_bulkstat+0xfa/0x170 [xfs]\n  xfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs]\n  xfs_file_ioctl+0xbf2/0x10e0 [xfs]\n  __x64_sys_ioctl+0x76/0xc0\n  do_syscall_64+0x4e/0x1e0\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n CPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub Not tainted 6.18.0-rc4-djwx #rc4 PREEMPT(lazy)  3d744dd94e92690f00a04398d2bd8631dcef1954\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014\n ==================================================================\n\nOn further analysis, I realized that the second parameter to min() is\nnot correct.  xfs_ifork::if_bytes is the size of the xfs_ifork::if_data\nbuffer.  if_bytes can be smaller than the data fork size because:\n\n(a) the forkoff code tries to keep the data area as large as possible\n(b) for symbolic links, if_bytes is the ondisk file size + 1\n(c) forkoff is always a multiple of 8.\n\nCase in point: for a single-byte symlink target, forkoff will be\n8 but the buffer will only be 2 bytes long.\n\nIn other words, the logic here is wrong and we walk off the end of the\nincore buffer.  Fix that."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfs: soluci\u00f3n de error de lectura de memoria fuera de l\u00edmites en la reparaci\u00f3n de enlaces simb\u00f3licos\n\nxfs/286 produjo este informe en mi flota de pruebas:\n\n ==================================================================\n ERROR: KFENCE: lectura fuera de l\u00edmites en memcpy_orig+0x54/0x110\n\n Lectura fuera de l\u00edmites en 0xffff88843fe9e038 (184B a la derecha de kfence-#184):\n  memcpy_orig+0x54/0x110\n  xrep_symlink_salvage_inline+0xb3/0xf0 [xfs]\n  xrep_symlink_salvage+0x100/0x110 [xfs]\n  xrep_symlink+0x2e/0x80 [xfs]\n  xrep_attempt+0x61/0x1f0 [xfs]\n  xfs_scrub_metadata+0x34f/0x5c0 [xfs]\n  xfs_ioc_scrubv_metadata+0x387/0x560 [xfs]\n  xfs_file_ioctl+0xe23/0x10e0 [xfs]\n  __x64_sys_ioctl+0x76/0xc0\n  do_syscall_64+0x4e/0x1e0\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n kfence-#184: 0xffff88843fe9df80-0xffff88843fe9dfea, tama\u00f1o=107, cach\u00e9=kmalloc-128\n\n asignado por la tarea 3470 en la CPU 1 a las 263329.131592s (hace 192823.508886s):\n  xfs_init_local_fork+0x79/0xe0 [xfs]\n  xfs_iformat_local+0xa4/0x170 [xfs]\n  xfs_iformat_data_fork+0x148/0x180 [xfs]\n  xfs_inode_from_disk+0x2cd/0x480 [xfs]\n  xfs_iget+0x450/0xd60 [xfs]\n  xfs_bulkstat_one_int+0x6b/0x510 [xfs]\n  xfs_bulkstat_iwalk+0x1e/0x30 [xfs]\n  xfs_iwalk_ag_recs+0xdf/0x150 [xfs]\n  xfs_iwalk_run_callbacks+0xb9/0x190 [xfs]\n  xfs_iwalk_ag+0x1dc/0x2f0 [xfs]\n  xfs_iwalk_args.constprop.0+0x6a/0x120 [xfs]\n  xfs_iwalk+0xa4/0xd0 [xfs]\n  xfs_bulkstat+0xfa/0x170 [xfs]\n  xfs_ioc_fsbulkstat.isra.0+0x13a/0x230 [xfs]\n  xfs_file_ioctl+0xbf2/0x10e0 [xfs]\n  __x64_sys_ioctl+0x76/0xc0\n  do_syscall_64+0x4e/0x1e0\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n CPU: 1 UID: 0 PID: 1300113 Comm: xfs_scrub No contaminado 6.18.0-rc4-djwx #rc4 PREEMPT(lazy)  3d744dd94e92690f00a04398d2bd8631dcef1954\n Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-4.module+el8.8.0+21164+ed375313 04/01/2014\n ==================================================================\n\nTras un an\u00e1lisis adicional, me di cuenta de que el segundo par\u00e1metro de min() no es correcto. xfs_ifork::if_bytes es el tama\u00f1o del b\u00fafer xfs_ifork::if_data. if_bytes puede ser menor que el tama\u00f1o del data fork porque:\n\n(a) el c\u00f3digo forkoff intenta mantener el \u00e1rea de datos lo m\u00e1s grande posible\n(b) para enlaces simb\u00f3licos, if_bytes es el tama\u00f1o del archivo en disco + 1\n(c) forkoff es siempre un m\u00faltiplo de 8.\n\nUn ejemplo claro: para un objetivo de enlace simb\u00f3lico de un solo byte, forkoff ser\u00e1 8 pero el b\u00fafer solo tendr\u00e1 2 bytes de longitud.\n\nEn otras palabras, la l\u00f3gica aqu\u00ed es incorrecta y nos salimos del final del b\u00fafer en memoria. Corregir eso."
          }
        ],
        "id": "CVE-2025-40246",
        "lastModified": "2026-10-19T19:10:00.130",
        "metrics": {},
        "published": "2025-12-04T16:16:17.970",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/678e1cc2f482e0985a0613ab4a5bf89c497e5acc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7c2d68e091584149fe89bcbaf9b99b3162d46ee7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/81a8685cac4bf081c93a7df591644f4f80240bb9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T02:57:02+00:00",
      "cve": "CVE-2025-40246",
      "id": "CVE-2025-40246",
      "initial_release_date": "2025-12-04T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfs: fix out of bounds memory read error in symlink repair",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40246.json",
      "version": "3"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    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.