CVE-2024-26853

published 2024-04-17

CVE-2024-26853: In the Linux kernel, the following vulnerability has been resolved: igc: avoid returning frame twice in XDP_REDIRECT When a frame can not be transmitted in…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

igc: avoid returning frame twice in XDP_REDIRECT

When a frame can not be transmitted in XDP_REDIRECT
(e.g. due to a full queue), it is necessary to free
it by calling xdp_return_frame_rx_napi.

However, this is the responsibility of the caller of
the ndo_xdp_xmit (see for example bq_xmit_all in
kernel/bpf/devmap.c) and thus calling it inside
igc_xdp_xmit (which is the ndo_xdp_xmit of the igc
driver) as well will lead to memory corruption.

In fact, bq_xmit_all expects that it can return all
frames after the last successfully transmitted one.
Therefore, break for the first not transmitted frame,
but do not call xdp_return_frame_rx_napi in igc_xdp_xmit.
This is equally implemented in other Intel drivers
such as the igb.

There are two alternatives to this that were rejected:
1. Return num_frames as all the frames would have been
transmitted and release them inside igc_xdp_xmit.
While it might work technically, it is not what
the return value is meant to represent (i.e. the
number of SUCCESSFULLY transmitted packets).
2. Rework kernel/bpf/devmap.c and all drivers to
support non-consecutively dropped packets.
Besides being complex, it likely has a negative
performance impact without a significant gain
since it is anyway unlikely that the next frame
can be transmitted if the previous one was dropped.

The memory corruption can be reproduced with
the following script which leads to a kernel panic
after a few seconds. It basically generates more
traffic than a i225 NIC can transmit and pushes it
via XDP_REDIRECT from a virtual interface to the
physical interface where frames get dropped.

#!/bin/bash
INTERFACE=enp4s0
INTERFACE_IDX=`cat /sys/class/net/$INTERFACE/ifindex`

sudo ip link add dev veth1 type veth peer name veth2
sudo ip link set up $INTERFACE
sudo ip link set up veth1
sudo ip link set up veth2

cat redirect.bpf.c

SEC("prog")
int redirect(struct xdp_md *ctx)
{
return bpf_redirect($INTERFACE_ID

Affected

21 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.82-1 (bookworm)	linux 6.1.82-1 (bookworm)
linux	linux	—	—
linux	linux	>= 4ff3203610928cac82d5627ce803559e78d61b91 < 63a3c1f3c9ecc654d851e7906d05334cd0c236e2	63a3c1f3c9ecc654d851e7906d05334cd0c236e2
linux	linux	>= 4ff3203610928cac82d5627ce803559e78d61b91 < 8df393af9e7e8dfd62e9c41dbaa4d2ff53bf794a	8df393af9e7e8dfd62e9c41dbaa4d2ff53bf794a
linux	linux	>= 4ff3203610928cac82d5627ce803559e78d61b91 < 1b3b8231386a572bac8cd5b6fd7e944b84f9bb1f	1b3b8231386a572bac8cd5b6fd7e944b84f9bb1f
linux	linux	>= 4ff3203610928cac82d5627ce803559e78d61b91 < ef27f655b438bed4c83680e4f01e1cde2739854b	ef27f655b438bed4c83680e4f01e1cde2739854b
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.1.82-1	6.1.82-1
linux	linux_kernel	>= 0 < 6.7.12-1	6.7.12-1
linux	linux_kernel	>= 0 < 6.7.12-1	6.7.12-1
linux	linux_kernel	>= 5.13 < 6.1.82	6.1.82
linux	linux_kernel	>= 6.2 < 6.6.22	6.6.22
linux	linux_kernel	>= 6.7 < 6.7.10	6.7.10
msrc	cbl2_kernel_5.15.186.1-1_on_cbl_mariner_2.0	—	—
msrc	cbl2_kernel_5.15.200.1-1_on_cbl_mariner_2.0	—	—
msrc	cbl2_kernel_5.15.202.1-1_on_cbl_mariner_2.0	—	—

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_msrc 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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