CVE-2021-47399

published 2024-05-21

CVE-2021-47399: In the Linux kernel, the following vulnerability has been resolved: ixgbe: Fix NULL pointer dereference in ixgbe_xdp_setup The ixgbe driver currently generates…

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:

ixgbe: Fix NULL pointer dereference in ixgbe_xdp_setup

The ixgbe driver currently generates a NULL pointer dereference with
some machine (online cpus ring_feature[RING_F_FDIR].limit = count;

It becomes 63.

When user use xdp, "ixgbe_set_rss_queues" will set queues num.
adapter->num_rx_queues = rss_i;
adapter->num_tx_queues = rss_i;
adapter->num_xdp_queues = ixgbe_xdp_queues(adapter);

And rss_i's value is from
f = &adapter->ring_feature[RING_F_FDIR];
rss_i = f->indices = f->limit;

So "num_rx_queues" > "num_xdp_queues", when run to "ixgbe_xdp_setup",
for (i = 0; i num_rx_queues; i++)
if (adapter->xdp_ring[i]->xsk_umem)

It leads to panic.

Call trace:
[exception RIP: ixgbe_xdp+368]
RIP: ffffffffc02a76a0 RSP: ffff9fe16202f8d0 RFLAGS: 00010297
RAX: 0000000000000000 RBX: 0000000000000020 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000000001c RDI: ffffffffa94ead90
RBP: ffff92f8f24c0c18 R8: 0000000000000000 R9: 0000000000000000
R10: ffff9fe16202f830 R11: 0000000000000000 R12: ffff92f8f24c0000
R13: ffff9fe16202fc01 R14: 000000000000000a R15: ffffffffc02a7530
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
7 [ffff9fe16202f8f0] dev_xdp_install at ffffffffa89fbbcc
8 [ffff9fe16202f920] dev_change_xdp_fd at ffffffffa8a08808
9 [ffff9fe16202f960] do_setlink at ffffffffa8a20235
10 [ffff9fe16202fa88] rtnl_setlink at ffffffffa8a20384
11 [ffff9fe16202fc78] rtnetlink_rcv_msg at ffffffffa8a1a8dd
12 [ffff9fe16202fcf0] netlink_rcv_skb at ffffffffa8a717eb
13 [ffff9fe16202fd40] netlink_unicast at ffffffffa8a70f88
14 [ffff9fe16202fd80] netlink_sendmsg at ffffffffa8a71319
15 [ffff9fe16202fdf0] sock_sendmsg at ffffffffa89df290
16 [ffff9fe16202fe08] __sys_sendto at ffffffffa89e19c8
17 [ffff9fe16202ff30] __x64_sys_sendto at ffffffffa89e1a64
18 [ffff9fe16202ff38] do_syscall_64 at ffffffffa84042b9
19 [ffff9fe16202ff50] entry_SYSCALL_64_after_hwframe at ffffffffa8c0008c

So I fix ixgbe_max_channels so that it will not

Affected

12 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.14.12-1 (bookworm)	linux 5.14.12-1 (bookworm)
linux	linux	—	—
linux	linux	>= 4a9b32f30f805ca596d76605903a48eab58e0b88 < 20f6c4a31a525edd9ea6243712b868ba0e4e331e	20f6c4a31a525edd9ea6243712b868ba0e4e331e
linux	linux	>= 4a9b32f30f805ca596d76605903a48eab58e0b88 < 2744341dd52e935344ca1b4bf189ba0d182a3e8e	2744341dd52e935344ca1b4bf189ba0d182a3e8e
linux	linux	>= 4a9b32f30f805ca596d76605903a48eab58e0b88 < 513e605d7a9ce136886cb42ebb2c40e9a6eb6333	513e605d7a9ce136886cb42ebb2c40e9a6eb6333
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.84-1	5.10.84-1
linux	linux_kernel	>= 0 < 5.14.12-1	5.14.12-1
linux	linux_kernel	>= 0 < 5.14.12-1	5.14.12-1
linux	linux_kernel	>= 0 < 5.14.12-1	5.14.12-1
linux	linux_kernel	>= 5.0 < 5.10.71	5.10.71
linux	linux_kernel	>= 5.11 < 5.14.10	5.14.10

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_redhat 5.5 MEDIUM

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CWE-476