CVE-2025-39735 (GCVE-0-2025-39735)
Vulnerability from cvelistv5
Published
2025-04-18 07:01
Modified
2026-08-05 12:04
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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              "value": "AV:L - JFS is a block-device filesystem (FS_REQUIRES_DEV); the malicious `size` field must arrive via a locally attached/mounted volume, and the trigger is a local syscall (listxattr/getxattr/setxattr) or an ACL lookup on a file in that volume. There is no network-facing path to `ea_get()`.\nAC:L - The attacker fully and deterministically controls the on-disk `jfs_ea_list.size` field; setting it above INT_MAX guarantees the negative clamp on every access, with no race to win and no dependence on memory layout the attacker cannot influence.\nPR:L - `ea_get()` runs before any permission or name check in `__jfs_getxattr`/`jfs_listxattr`, and is reached from `jfs_get_acl()` during ordinary permission checks, so an unprivileged user with read/search access to the mounted crafted volume triggers it; in the auto-mount/kiosk scenario the equivalent unprivileged-attacker framing PR:N/UI:R yields the same score.\nUI:N - Once the crafted volume is mounted (attacker-inserted removable media auto-mounted by udisks2, or an admin-mounted untrusted image), no victim action is required \u2014 the attacker\u0027s own `listxattr()`/`getxattr()` call, or even a path-traversal ACL lookup, reaches the bug directly.\nS:U - The out-of-bounds reads and the resulting oops are confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The corrupted length drives an effectively unbounded walk past (and before) the ea buffer, hex-dumping 16 bytes of adjacent kernel heap memory per iteration \u2014 together with kernel addresses \u2014 into the kernel log; this is a large-scale kernel memory disclosure, not a small bounded read.\nI:N - The defect is read-only: `hex_dump_to_buffer()` clamps its per-line length to rowsize and bounds-checks `linebuf` at every byte, so no out-of-bounds write or memory corruption occurs and no control-flow primitive is produced.\nA:H - The loop performs billions of `printk` iterations (console livelock, soft lockup, RCU stalls, log flooding) and inevitably dereferences an unmapped kernel address, producing a KASAN report or page-fault oops/panic."
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[{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T16:13:35.286674Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T14:42:03.710Z\"}}], \"cna\": {\"title\": \"jfs: fix slab-out-of-bounds read in ea_get()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\"}}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6e39b681d1eb16f408493bf5023788b57f68998c\", \"lessThan\": \"3d6fd5b9c6acbc005e53d0211c7381f566babec1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2\", \"lessThan\": \"50afcee7011155933d8d5e8832f52eeee018cfd3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"27a93c45e16ac25a0e2b5e5668e2d1beca56a478\", \"lessThan\": \"78c9cbde8880ec02d864c166bcb4fe989ce1d95f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9c356fc32a4480a2c0e537a05f2a8617633ddad0\", \"lessThan\": \"46e2c031aa59ea65128991cbca474bd5c0c2ecdb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4\", \"lessThan\": \"a8c31808925b11393a6601f534bb63bac5366bab\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8c505ebeed8045b488b2e60b516c752b851f8437\", \"lessThan\": \"0beddc2a3f9b9cf7d8887973041e36c2d0fa3652\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d9f9d96136cba8fedd647d2c024342ce090133c2\", \"lessThan\": \"16d3d36436492aa248b2d8045e75585ebcc2f34d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d9f9d96136cba8fedd647d2c024342ce090133c2\", \"lessThan\": \"5263822558a8a7c0d0248d5679c2dcf4d5cda61f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d9f9d96136cba8fedd647d2c024342ce090133c2\", \"lessThan\": \"fdf480da5837c23b146c4743c18de97202fcab37\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4ea25fa8747fb8b1e5a11d87b852023ecf7ae420\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"676a787048aafd4d1b38a522b05a9cc77e1b0a33\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.4.287\", \"lessThan\": \"5.4.292\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.10.231\", \"lessThan\": \"5.10.236\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.174\", \"lessThan\": \"5.15.180\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.120\", \"lessThan\": \"6.1.134\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.64\", \"lessThan\": \"6.6.87\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.12.2\", \"lessThan\": \"6.12.23\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.325\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.11.11\", \"lessThan\": \"6.12\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/jfs/xattr.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.236\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.180\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.87\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.14.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/jfs/xattr.c\"], \"defaultStatus\": \"affected\"}], \"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\"}, {\"url\": \"https://git.kernel.org/stable/c/a8c31808925b11393a6601f534bb63bac5366bab\"}, {\"url\": \"https://git.kernel.org/stable/c/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652\"}, {\"url\": \"https://git.kernel.org/stable/c/16d3d36436492aa248b2d8045e75585ebcc2f34d\"}, {\"url\": \"https://git.kernel.org/stable/c/5263822558a8a7c0d0248d5679c2dcf4d5cda61f\"}, {\"url\": \"https://git.kernel.org/stable/c/fdf480da5837c23b146c4743c18de97202fcab37\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.292\", \"versionStartIncluding\": \"5.4.287\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.236\", \"versionStartIncluding\": \"5.10.231\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.180\", \"versionStartIncluding\": \"5.15.174\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.134\", \"versionStartIncluding\": \"6.1.120\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.87\", \"versionStartIncluding\": \"6.6.64\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.23\", \"versionStartIncluding\": \"6.12.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.11\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14.2\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.325\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.11.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-07-30T05:57:17.211Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-39735\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-30T05:57:17.211Z\", \"dateReserved\": \"2025-04-16T07:20:57.119Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-18T07:01:36.453Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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