CVE-2025-39735 Vulnerability Analysis & Exploit Details

CVE-2025-39735
Vulnerability Scoring

7.1
/10
Very High Risk

Highly exploitable, CVE-2025-39735 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2025-39735 Details

Status: Analyzed

Last updated: 🕝 28 Apr 2025, 14:37 UTC
Originally published on: 🕖 18 Apr 2025, 07:15 UTC

Time between publication and last update: 10 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVE-2025-39735 Vulnerability Summary

CVE-2025-39735: 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.

Assessing the Risk of CVE-2025-39735

Access Complexity Graph

The exploitability of CVE-2025-39735 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2025-39735

CVE-2025-39735 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2025-39735, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2025-39735, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2025-39735 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: None
    CVE-2025-39735 poses no threat to data integrity.
  • Availability: High
    CVE-2025-39735 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2025-39735 References

External References

CWE Common Weakness Enumeration

CWE-125

CAPEC Common Attack Pattern Enumeration and Classification

  • Overread Buffers CAPEC-540 An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:4.19.325:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:4.19.325:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.4.287:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.4.287:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.4.288:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.4.288:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.4.289:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.4.289:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.4.290:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.4.290:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.4.291:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.4.291:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.231:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.231:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.232:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.232:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.233:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.233:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.234:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.234:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.235:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.235:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.174:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.174:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.175:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.175:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.176:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.176:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.177:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.177:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.178:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.178:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.179:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.179:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.120:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.120:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.121:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.121:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.122:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.122:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.123:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.123:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.124:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.124:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.125:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.125:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.126:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.126:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.127:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.127:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.128:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.128:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.129:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.129:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.130:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.130:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.131:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.131:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.132:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.132:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.133:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.133:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.64:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.64:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.65:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.65:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.66:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.66:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.67:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.67:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.68:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.68:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.69:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.69:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.70:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.70:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.71:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.71:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.72:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.72:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.73:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.73:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.74:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.74:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.75:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.75:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.76:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.76:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.77:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.77:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.78:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.78:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.79:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.79:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.80:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.80:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.81:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.81:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.83:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.83:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.84:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.84:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.85:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.85:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.11:rc8:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.11:rc8:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.16:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.16:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.17:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.17:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.18:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.18:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.19:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.19:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.20:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.20:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.21:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.21:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.13.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.13.9:*:*:*:*:*:*:*

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