CVE-2021-47012
RDMA/siw: Fix a use after free in siw_alloc_mr
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
RDMA/siw: Fix a use after free in siw_alloc_mr
Our code analyzer reported a UAF.
In siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of
siw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via
kfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a
freed object. After, the execution continue up to the err_out branch of
siw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).
My patch moves "mr->mem = mem" behind the if (xa_alloc_cyclic(..)<0) {}
section, to avoid the uaf.
En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: RDMA/siw: Corrige un use after free en siw_alloc_mr Nuestro analizador de código informó un UAF. En siw_alloc_mr(), llama a siw_mr_add_mem(mr,..). En la implementación de siw_mr_add_mem(), mem se asigna a mr->mem y luego mem se libera mediante kfree(mem) si xa_alloc_ciclic() falla. Aquí, mr->mem todavía apunta a un objeto liberado. Después, la ejecución continúa hasta la rama err_out de siw_alloc_mr, y el mr->mem liberado se usa en siw_mr_drop_mem(mr). Mi parche mueve "mr->mem = mem" detrás de la sección if (xa_alloc_ciclic(..)<0) {}, para evitar el uaf.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-27 CVE Reserved
- 2024-02-28 CVE Published
- 2024-02-29 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/2251334dcac9eb337575d8767e2a6a7e81848f7f | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
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" | >= 5.3 < 5.4.119 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.3 < 5.4.119" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.3 < 5.10.37 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.3 < 5.10.37" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.3 < 5.11.21 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.3 < 5.11.21" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.3 < 5.12.4 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.3 < 5.12.4" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.3 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.3 < 5.13" | en |
Affected
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