CVE-2021-47559
net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: corrige la desreferenciación del puntero NULL en smc_vlan_by_tcpsk() Coverity informa un posible problema de desreferenciación de NULL: en smc_vlan_by_tcpsk(): 6. return_null: netdev_lower_get_next devuelve NULL (comprobado 29 de 30 veces). 7. var_assigned: Asignación: ndev = valor de retorno NULL de netdev_lower_get_next. 1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower); CID 1468509 (#1 de 1): Desreferenciar valor de retorno nulo (NULL_RETURNS) 8. desreferencia: Desreferenciar un puntero que podría ser NULL ndev al llamar a is_vlan_dev. 1624 if (is_vlan_dev(ndev)) { Elimine la implementación manual y use netdev_walk_all_lower_dev() para iterar sobre los dispositivos inferiores. Mientras esté en él, elimine un comentario de parámetro de función obsoleto.
A vulnerability was found in the Linux kernel's SMC implementation in the smc_vlan_by_tcpsk() function. A potential NULL pointer dereference occurred when handling lower network devices, leading to system crashes and resulting in denial of service.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-24 CVE Reserved
- 2024-05-24 CVE Published
- 2024-06-11 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-476: NULL Pointer Dereference
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/cb9d43f6775457cac75544bc4197f26ac2b6f294 | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2021-47559 | 2024-09-24 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2283390 | 2024-09-24 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.18 < 5.10.83 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.18 < 5.10.83" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.18 < 5.15.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.18 < 5.15.6" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.18 < 5.16 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.18 < 5.16" | en |
Affected
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