CVE-2026-31636 Vulnerability Analysis & Exploit Details

CVE-2026-31636
Vulnerability Scoring

9.1
/10
Critical Risk

As a catastrophic security flaw, CVE-2026-31636 has severe implications, demanding immediate intervention.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-31636 Details

Status: Analyzed

Last updated: 🕗 27 Apr 2026, 20:21 UTC
Originally published on: 🕒 24 Apr 2026, 15:16 UTC

Time between publication and last update: 3 days

CVSS Release: version 3

CVSS3 Source

416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-31636 Vulnerability Summary

CVE-2026-31636: In the Linux kernel, the following vulnerability has been resolved: rxrpc: fix RESPONSE authenticator parser OOB read rxgk_verify_authenticator() copies auth_len bytes into a temporary buffer and then passes p + auth_len as the parser limit to rxgk_do_verify_authenticator(). Since p is a __be32 *, that inflates the parser end pointer by a factor of four and lets malformed RESPONSE authenticators read past the kmalloc() buffer. Decoded from the original latest-net reproduction logs with scripts/decode_stacktrace.sh: BUG: KASAN: slab-out-of-bounds in rxgk_verify_response() Call Trace: dump_stack_lvl() [lib/dump_stack.c:123] print_report() [mm/kasan/report.c:379 mm/kasan/report.c:482] kasan_report() [mm/kasan/report.c:597] rxgk_verify_response() [net/rxrpc/rxgk.c:1103 net/rxrpc/rxgk.c:1167 net/rxrpc/rxgk.c:1274] rxrpc_process_connection() [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364 net/rxrpc/conn_event.c:386] process_one_work() [kernel/workqueue.c:3281] worker_thread() [kernel/workqueue.c:3353 kernel/workqueue.c:3440] kthread() [kernel/kthread.c:436] ret_from_fork() [arch/x86/kernel/process.c:164] Allocated by task 54: rxgk_verify_response() [include/linux/slab.h:954 net/rxrpc/rxgk.c:1155 net/rxrpc/rxgk.c:1274] rxrpc_process_connection() [net/rxrpc/conn_event.c:266 net/rxrpc/conn_event.c:364 net/rxrpc/conn_event.c:386] Convert the byte count to __be32 units before constructing the parser limit.

Assessing the Risk of CVE-2026-31636

Access Complexity Graph

The exploitability of CVE-2026-31636 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-2026-31636

With low attack complexity and no required privileges, CVE-2026-31636 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

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-2026-31636, 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-2026-31636, 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-2026-31636 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: None
    CVE-2026-31636 poses no threat to data integrity.
  • Availability: High
    CVE-2026-31636 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-31636 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:6.16.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.16:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.16:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.17:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.17:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.18:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.18:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.19:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.19:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.20:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.20:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.21:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.21:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.22:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.22:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*

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