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CVE PROGRAM SOURCE RECORD7.1 High

CVE-2025-39735

jfs: fix slab-out-of-bounds read in ea_get()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 6e39b681d1eb16f408493bf5023788b57f68998c to < 3d6fd5b9c6acbc005e53d0211c7381f566babec1affected
  • bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2 to < 50afcee7011155933d8d5e8832f52eeee018cfd3affected
  • 27a93c45e16ac25a0e2b5e5668e2d1beca56a478 to < 78c9cbde8880ec02d864c166bcb4fe989ce1d95faffected
  • 9c356fc32a4480a2c0e537a05f2a8617633ddad0 to < 46e2c031aa59ea65128991cbca474bd5c0c2ecdbaffected
  • 9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4 to < a8c31808925b11393a6601f534bb63bac5366babaffected
  • 8c505ebeed8045b488b2e60b516c752b851f8437 to < 0beddc2a3f9b9cf7d8887973041e36c2d0fa3652affected
  • d9f9d96136cba8fedd647d2c024342ce090133c2 to < 16d3d36436492aa248b2d8045e75585ebcc2f34daffected
  • d9f9d96136cba8fedd647d2c024342ce090133c2 to < 5263822558a8a7c0d0248d5679c2dcf4d5cda61faffected
  • d9f9d96136cba8fedd647d2c024342ce090133c2 to < fdf480da5837c23b146c4743c18de97202fcab37affected
  • 4ea25fa8747fb8b1e5a11d87b852023ecf7ae420affected
  • 676a787048aafd4d1b38a522b05a9cc77e1b0a33affected
  • 5.4.287 to < 5.4.292affected
  • 5.10.231 to < 5.10.236affected
  • 5.15.174 to < 5.15.180affected
  • 6.1.120 to < 6.1.134affected
  • 6.6.64 to < 6.6.87affected
  • 6.12.2 to < 6.12.23affected
  • 4.19.325 to < 4.20affected
  • 6.11.11 to < 6.12affected

Linux Linux

Default version status: affected

  • 6.13affected
  • 0 to < 6.13unaffected
  • 5.4.292 to ≤ 5.4.*unaffected
  • 5.10.236 to ≤ 5.10.*unaffected
  • 5.15.180 to ≤ 5.15.*unaffected
  • 6.1.134 to ≤ 6.1.*unaffected
  • 6.6.87 to ≤ 6.6.*unaffected
  • 6.12.23 to ≤ 6.12.*unaffected
  • 6.13.11 to ≤ 6.13.*unaffected
  • 6.14.2 to ≤ 6.14.*unaffected
  • 6.15 to ≤ *unaffected

References