CVE-2026-45998

Advisory lineage Upstream: 0 Downstream: 12
Analyzed
Published: 27 May 2026, 12:55
Last modified:15 Jul 2026, 00:51

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
0.13% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

27 May 2026, 12:55
Published
Vulnerability first disclosed
15 Jul 2026, 00:51
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix potential UAF after skb_unshare() failure If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops. Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided. And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • v3.1•HIGH•Score: 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.13%• Percentile: 3%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

  • CWE-825•Expired Pointer Dereference

    The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.

Affected Systems

  • linux•linux

    ≥ 2d1faf7a0ca3c0b327cf064c80e4e775532c9319, < e3bf143b1e98fb3d6d9e6825bcd683974d478e8c | ≥ 2d1faf7a0ca3c0b327cf064c80e4e775532c9319, < bf20f46d94f1db38e6ffc0ca204a5fe0de01b495 | ≥ 2d1faf7a0ca3c0b327cf064c80e4e775532c9319, < 996b0487b3cdda4c91811dbb1c9564626bc840bd | ≥ 2d1faf7a0ca3c0b327cf064c80e4e775532c9319, < 8fde6296c4d4da2be7ab761305ab7f232b94eefd | ≥ 2d1faf7a0ca3c0b327cf064c80e4e775532c9319, < 1f2740150f904bfa60e4bad74d65add3ccb5e7f8 | 6.2

  • linux•linux kernel

    ≥ 6.2, < 6.6.140 | ≥ 6.7, < 6.12.86 | ≥ 6.13, < 6.18.27 | ≥ 6.19, < 7.0.4

References (9)