CVE-2025-39735 (GCVE-0-2025-39735)
Vulnerability from cvelistv5
Published
2025-04-18 07:01
Modified
2026-05-23 16:00
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: jfs: fix slab-out-of-bounds read in ea_get() During the "size_check" label in ea_get(), the code checks if the extended attribute list (xattr) size matches ea_size. If not, it logs "ea_get: invalid extended attribute" and calls print_hex_dump(). Here, EALIST_SIZE(ea_buf->xattr) returns 4110417968, which exceeds INT_MAX (2,147,483,647). Then ea_size is clamped: int size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf->xattr)); Although clamp_t aims to bound ea_size between 0 and 4110417968, the upper limit is treated as an int, causing an overflow above 2^31 - 1. This leads "size" to wrap around and become negative (-184549328). The "size" is then passed to print_hex_dump() (called "len" in print_hex_dump()), it is passed as type size_t (an unsigned type), this is then stored inside a variable called "int remaining", which is then assigned to "int linelen" which is then passed to hex_dump_to_buffer(). In print_hex_dump() the for loop, iterates through 0 to len-1, where len is 18446744073525002176, calling hex_dump_to_buffer() on each iteration: for (i = 0; i < len; i += rowsize) { linelen = min(remaining, rowsize); remaining -= rowsize; hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, linebuf, sizeof(linebuf), ascii); ... } The expected stopping condition (i < len) is effectively broken since len is corrupted and very large. This eventually leads to the "ptr+i" being passed to hex_dump_to_buffer() to get closer to the end of the actual bounds of "ptr", eventually an out of bounds access is done in hex_dump_to_buffer() in the following for loop: for (j = 0; j < len; j++) { if (linebuflen < lx + 2) goto overflow2; ch = ptr[j]; ... } To fix this we should validate "EALIST_SIZE(ea_buf->xattr)" before it is utilised.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6e39b681d1eb16f408493bf5023788b57f68998c
Version: bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2
Version: 27a93c45e16ac25a0e2b5e5668e2d1beca56a478
Version: 9c356fc32a4480a2c0e537a05f2a8617633ddad0
Version: 9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4
Version: 8c505ebeed8045b488b2e60b516c752b851f8437
Version: d9f9d96136cba8fedd647d2c024342ce090133c2
Version: d9f9d96136cba8fedd647d2c024342ce090133c2
Version: d9f9d96136cba8fedd647d2c024342ce090133c2
Version: 4ea25fa8747fb8b1e5a11d87b852023ecf7ae420
Version: 676a787048aafd4d1b38a522b05a9cc77e1b0a33
Version: 5.4.287   ≤
Version: 5.10.231   ≤
Version: 5.15.174   ≤
Version: 6.1.120   ≤
Version: 6.6.64   ≤
Version: 6.12.2   ≤
Version: 4.19.325   ≤
Version: 6.11.11   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix slab-out-of-bounds read in ea_get()\n\nDuring the \"size_check\" label in ea_get(), the code checks if the extended\nattribute list (xattr) size matches ea_size. If not, it logs\n\"ea_get: invalid extended attribute\" and calls print_hex_dump().\n\nHere, EALIST_SIZE(ea_buf-\u003exattr) returns 4110417968, which exceeds\nINT_MAX (2,147,483,647). Then ea_size is clamped:\n\n\tint size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf-\u003exattr));\n\nAlthough clamp_t aims to bound ea_size between 0 and 4110417968, the upper\nlimit is treated as an int, causing an overflow above 2^31 - 1. This leads\n\"size\" to wrap around and become negative (-184549328).\n\nThe \"size\" is then passed to print_hex_dump() (called \"len\" in\nprint_hex_dump()), it is passed as type size_t (an unsigned\ntype), this is then stored inside a variable called\n\"int remaining\", which is then assigned to \"int linelen\" which\nis then passed to hex_dump_to_buffer(). In print_hex_dump()\nthe for loop, iterates through 0 to len-1, where len is\n18446744073525002176, calling hex_dump_to_buffer()\non each iteration:\n\n\tfor (i = 0; i \u003c len; i += rowsize) {\n\t\tlinelen = min(remaining, rowsize);\n\t\tremaining -= rowsize;\n\n\t\thex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,\n\t\t\t\t   linebuf, sizeof(linebuf), ascii);\n\n\t\t...\n\t}\n\nThe expected stopping condition (i \u003c len) is effectively broken\nsince len is corrupted and very large. This eventually leads to\nthe \"ptr+i\" being passed to hex_dump_to_buffer() to get closer\nto the end of the actual bounds of \"ptr\", eventually an out of\nbounds access is done in hex_dump_to_buffer() in the following\nfor loop:\n\n\tfor (j = 0; j \u003c len; j++) {\n\t\t\tif (linebuflen \u003c lx + 2)\n\t\t\t\tgoto overflow2;\n\t\t\tch = ptr[j];\n\t\t...\n\t}\n\nTo fix this we should validate \"EALIST_SIZE(ea_buf-\u003exattr)\"\nbefore it is utilised."
        }
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        "dateUpdated": "2026-05-23T16:00:38.209Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3d6fd5b9c6acbc005e53d0211c7381f566babec1"
        },
        {
          "url": "https://git.kernel.org/stable/c/50afcee7011155933d8d5e8832f52eeee018cfd3"
        },
        {
          "url": "https://git.kernel.org/stable/c/78c9cbde8880ec02d864c166bcb4fe989ce1d95f"
        },
        {
          "url": "https://git.kernel.org/stable/c/46e2c031aa59ea65128991cbca474bd5c0c2ecdb"
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        {
          "url": "https://git.kernel.org/stable/c/a8c31808925b11393a6601f534bb63bac5366bab"
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          "url": "https://git.kernel.org/stable/c/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652"
        },
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          "url": "https://git.kernel.org/stable/c/16d3d36436492aa248b2d8045e75585ebcc2f34d"
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        },
        {
          "url": "https://git.kernel.org/stable/c/fdf480da5837c23b146c4743c18de97202fcab37"
        }
      ],
      "title": "jfs: fix slab-out-of-bounds read in ea_get()",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39735",
    "datePublished": "2025-04-18T07:01:36.453Z",
    "dateReserved": "2025-04-16T07:20:57.119Z",
    "dateUpdated": "2026-05-23T16:00:38.209Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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