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Review reviewHigh

CVE-2026-45998

Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6

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) fo...

CVSS
7.8
EPSS
0.13%
2.90% percentile
CISA KEV
Not listed
Published
2026.05.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.8

Vulnerability overview

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) fo...

Affected product and versions

Product
Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6
Affected versions
>= 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 < e3bf143b1e98fb3d6d9e6825bcd683974d478e8c, >= 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 < bf20f46d94f1db38e6ffc0ca204a5fe0de01b495, >= 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 < 996b0487b3cdda4c91811dbb1c9564626bc840bd, >= 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 < 8fde6296c4d4da2be7ab761305ab7f232b94eefd, >= 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 < 1f2740150f904bfa60e4bad74d65add3ccb5e7f8, >= 6.2, >= 6.2 < 6.6.140, >= 6.7 < 6.12.86, >= 6.13 < 6.18.27, >= 6.19 < 7.0.4
Fixed versions
6.6.140, 6.12.86, 6.18.27, 7.0.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416, CWE-825