7.8

CVE-2026-45998

rxrpc: Fix potential UAF after skb_unshare() failure

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.140
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.86
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.27
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.4
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.029
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.

https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c
Patch
https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495
Patch
https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd
Patch
https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd
Patch
https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8
Patch
https://access.redhat.com/security/cve/CVE-2026-45998
https://bugzilla.redhat.com/show_bug.cgi?id=2482024
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45998.json
https://access.redhat.com/errata/RHSA-2026:34911