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

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.30% · top 77% of all CVEs (11 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Affected products

• Linux · Linux

  • affected 6e39b681d1eb16f408493bf5023788b57f68998c – < 3d6fd5b9c6acbc005e53d0211c7381f566babec1
  • affected bbf3f1fd8a0ac7df1db36a9b9e923041a14369f2 – < 50afcee7011155933d8d5e8832f52eeee018cfd3
  • affected 27a93c45e16ac25a0e2b5e5668e2d1beca56a478 – < 78c9cbde8880ec02d864c166bcb4fe989ce1d95f
  • affected 9c356fc32a4480a2c0e537a05f2a8617633ddad0 – < 46e2c031aa59ea65128991cbca474bd5c0c2ecdb
  • affected 9353cdf28d4c5c0ff19c5df7fbf81ea774de43a4 – < a8c31808925b11393a6601f534bb63bac5366bab
  • affected 8c505ebeed8045b488b2e60b516c752b851f8437 – < 0beddc2a3f9b9cf7d8887973041e36c2d0fa3652
  • affected d9f9d96136cba8fedd647d2c024342ce090133c2 – < 16d3d36436492aa248b2d8045e75585ebcc2f34d
  • affected d9f9d96136cba8fedd647d2c024342ce090133c2 – < 5263822558a8a7c0d0248d5679c2dcf4d5cda61f
  • affected d9f9d96136cba8fedd647d2c024342ce090133c2 – < fdf480da5837c23b146c4743c18de97202fcab37
  • affected 4ea25fa8747fb8b1e5a11d87b852023ecf7ae420
  • affected 676a787048aafd4d1b38a522b05a9cc77e1b0a33
  • affected 5.4.287 – < 5.4.292
  • affected 5.10.231 – < 5.10.236
  • affected 5.15.174 – < 5.15.180
  • affected 6.1.120 – < 6.1.134
  • affected 6.6.64 – < 6.6.87
  • affected 6.12.2 – < 6.12.23
  • affected 4.19.325 – < 4.20
  • affected 6.11.11 – < 6.12

• Linux · Linux

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

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2025-11818 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-39735](https://cveledger.app/badge/CVE-2025-39735.svg)](https://cveledger.app/cve/CVE-2025-39735)

Record last updated 5 Aug 2026, 12:04 UTC.