Linux Kernel up to 6.14.1 jfs ea_get out-of-bounds

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5.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.14.1 and classified as problematic. Affected by this vulnerability is the function ea_get of the component jfs. Such manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2025-39735. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 6.14.1. Affected by this issue is the function ea_get of the component jfs. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-39735 since 04/16/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 234884 (Debian dsa-5907 : affs-modules-6.1.0-33-4kc-malta-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.292, 5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.12.23, 6.13.11, 6.14.2 or 6.15-rc1 eliminates this vulnerability. Applying the patch 3d6fd5b9c6acbc005e53d0211c7381f566babec1/50afcee7011155933d8d5e8832f52eeee018cfd3/78c9cbde8880ec02d864c166bcb4fe989ce1d95f/46e2c031aa59ea65128991cbca474bd5c0c2ecdb/a8c31808925b11393a6601f534bb63bac5366bab/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652/16d3d36436492aa248b2d8045e75585ebcc2f34d/5263822558a8a7c0d0248d5679c2dcf4d5cda61f/fdf480da5837c23b146c4743c18de97202fcab37 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (234884) and CERT Bund (WID-SEC-2025-0861). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • SolarWinds Security Event Manager
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 234884
Nessus Name: Debian dsa-5907 : affs-modules-6.1.0-33-4kc-malta-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.4.292/5.10.236/5.15.180/6.1.134/6.6.87/6.12.23/6.13.11/6.14.2/6.15-rc1
Patch: 3d6fd5b9c6acbc005e53d0211c7381f566babec1/50afcee7011155933d8d5e8832f52eeee018cfd3/78c9cbde8880ec02d864c166bcb4fe989ce1d95f/46e2c031aa59ea65128991cbca474bd5c0c2ecdb/a8c31808925b11393a6601f534bb63bac5366bab/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652/16d3d36436492aa248b2d8045e75585ebcc2f34d/5263822558a8a7c0d0248d5679c2dcf4d5cda61f/fdf480da5837c23b146c4743c18de97202fcab37

Timelineinfo

04/16/2025 🔍
04/18/2025 +2 days 🔍
04/18/2025 +0 days 🔍
02/16/2026 +304 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39735 (🔍)
GCVE (CVE): GCVE-0-2025-39735
GCVE (VulDB): GCVE-100-305624
CERT Bund: WID-SEC-2025-0861 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/18/2025 11:31
Updated: 02/16/2026 16:35
Changes: 04/18/2025 11:31 (59), 04/28/2025 08:33 (2), 04/28/2025 17:13 (12), 10/26/2025 07:10 (7), 11/15/2025 17:48 (1), 02/16/2026 16:35 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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