CVE-2021-47559

published 2024-05-24

CVE-2021-47559: In the Linux kernel, the following vulnerability has been resolved: net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk() Coverity reports a possible…

Priority P4 20 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:

net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()

Coverity reports a possible NULL dereferencing problem:

in smc_vlan_by_tcpsk():
6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times).
7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next.
1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
CID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS)
8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev.
1624 if (is_vlan_dev(ndev)) {

Remove the manual implementation and use netdev_walk_all_lower_dev() to
iterate over the lower devices. While on it remove an obsolete function
parameter comment.

Affected

11 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.15.15-1 (bookworm)	linux 5.15.15-1 (bookworm)
linux	linux	—	—
linux	linux	>= cb9d43f6775457cac75544bc4197f26ac2b6f294 < c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff	c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff
linux	linux	>= cb9d43f6775457cac75544bc4197f26ac2b6f294 < bb851d0fb02547d03cd40106b5f2391c4fed6ed1	bb851d0fb02547d03cd40106b5f2391c4fed6ed1
linux	linux	>= cb9d43f6775457cac75544bc4197f26ac2b6f294 < 587acad41f1bc48e16f42bb2aca63bf323380be8	587acad41f1bc48e16f42bb2aca63bf323380be8
linux	linux_kernel	>= 0 < 5.10.84-1	5.10.84-1
linux	linux_kernel	>= 0 < 5.15.15-1	5.15.15-1
linux	linux_kernel	>= 0 < 5.15.15-1	5.15.15-1
linux	linux_kernel	>= 0 < 5.15.15-1	5.15.15-1
linux	linux_kernel	>= 4.18 < 5.10.83	5.10.83
linux	linux_kernel	>= 5.11 < 5.15.6	5.15.6

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