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HIGH

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

Published Apr 18, 2025

Description

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

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-125

Out-of-bounds Read

References (17)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner Linux
Published Apr 18, 2025
Updated Aug 5, 2026
Reserved Apr 16, 2025
Link CVE-2025-39735
CISA Vulnrichment
Updated Oct 1, 2025
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2025-39735
Red Hat
Severity Moderate
Public date Apr 18, 2025
Links CVE-2025-39735 - Bugzilla
ENISA EUVD
Assigner Linux
Published Apr 18, 2025
Updated Aug 5, 2026
Exploited since n/a
Link EUVD-2025-11818
EUVD-2025-11818