CVE-2024-26720
mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again
(struct dirty_throttle_control *)->thresh is an unsigned long, but is
passed as the u32 divisor argument to div_u64(). On architectures where
unsigned long is 64 bytes, the argument will be implicitly truncated.
Use div64_u64() instead of div_u64() so that the value used in the "is
this a safe division" check is the same as the divisor.
Also, remove redundant cast of the numerator to u64, as that should happen
implicitly.
This would be difficult to exploit in memcg domain, given the ratio-based
arithmetic domain_drity_limits() uses, but is much easier in global
writeback domain with a BDI_CAP_STRICTLIMIT-backing device, using e.g.
vm.dirty_bytes=(1<<32)*PAGE_SIZE so that dtc->thresh == (1<<32)
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mm/writeback: corrige la posible división por cero en wb_dirty_limits(), nuevamente (struct dirty_throttle_control *)->thresh es un largo sin firmar, pero se pasa como argumento del divisor u32 a div_u64(). En arquitecturas donde la longitud sin firmar es de 64 bytes, el argumento se truncará implícitamente. Utilice div64_u64() en lugar de div_u64() para que el valor utilizado en la comprobación "¿Es esta una división segura" sea el mismo que el divisor? Además, elimine la conversión redundante del numerador a u64, ya que eso debería suceder implícitamente. Esto sería difícil de explotar en el dominio memcg, dado el uso de la aritmética basada en proporciones domain_drity_limits(), pero es mucho más fácil en el dominio de reescritura global con un dispositivo de respaldo BDI_CAP_STRICTLIMIT, usando, por ejemplo, vm.dirty_bytes=(1<<32)*PAGE_SIZE de modo que dtc->thresh == (1<<32)
A vulnerability was found in the wb_dirty_limits() function in the Linux kernel memory management (mm) subsystem which can lead to a divide-by-zero error. This issue could lead to a potential kernel crash.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-19 CVE Reserved
- 2024-04-03 CVE Published
- 2024-07-19 EPSS Updated
- 2024-09-11 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-369: Divide By Zero
CAPEC
References (21)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/f6789593d5cea42a4ecb1cbeab6a23ade5ebbba7 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/c5fec566bef6a027e75c84c35ec970482eb88cea | Vuln. Introduced | |
| https://git.kernel.org/stable/c/c05d1fe6c19f4df2f0b8cba151a8f0c53b87d878 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/3f7d325fbbe12e5ade71a1f90759c06ed2d27e3c | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2024-26720 | 2024-09-24 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2273141 | 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" | >= 3.16 < 4.19.307 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 4.19.307" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 4.19.318 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 4.19.318" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 5.4.269 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 5.4.269" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 5.4.280 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 5.4.280" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 5.10.210 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 5.10.210" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 5.10.222 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 5.10.222" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 5.15.149 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 5.15.149" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 5.15.163 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 5.15.163" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 6.1.79 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 6.1.79" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 6.1.98 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 6.1.98" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 6.6.18 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 6.6.18" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 6.6.39 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 6.6.39" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 6.7.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 6.7.6" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 6.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 6.8" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 3.16 < 6.9.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.16 < 6.9.9" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 3.12.27 Search vendor "Linux" for product "Linux Kernel" and version "3.12.27" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 3.14.16 Search vendor "Linux" for product "Linux Kernel" and version "3.14.16" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 3.15.9 Search vendor "Linux" for product "Linux Kernel" and version "3.15.9" | en |
Affected
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