Linux · Kernel
CVE-2021-22555
Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE
Qué es
A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space
CISA: Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space.
Qué hacer
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Plazo para las agencias federales de EE. UU.: 27 de octubre de 2025
- Añadida a la lista de CISA
- 6 de octubre de 2025
- Publicada
- 7 de julio de 2021
- Gravedad
- Alto 8,3 CVSS 3.1
- Probabilidad de ataques en los próximos 30 días (EPSS)
- 79% entre el 0,4% superior de todas las vulnerabilidades conocidas
- Debilidad
- CWE-787
- Más detalles
- NVD · CVE.org · CISA
Todas las referencias (9)
- https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492c…
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457…
- http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html
- https://security.netapp.com/advisory/ntap-20210805-0010/
- http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html
- http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html
- http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.…
- http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
Más fallos explotados de Linux
| Añadido | Vulnerabilidad | Producto | Gravedad | Prob. de ataque |
|---|---|---|---|---|
| 18 sept 2026 | Improper Check for Unusual or Exceptional Conditions | Kernel | Crítica 9,8 | 3,3% |
| 18 sept 2026 | Race Condition | Kernel | Alto 7,8 | 1,6% |
| 18 sept 2026 | Out-of-Bounds Write | Kernel | Alto 8,8 | 0,9% |
| 27 ago 2026 | Unspecified | Kernel | Alto 7,8 | 0,7% |
| 26 ago 2026 | Out-of-Bounds Write | Kernel | Alto 7,8 | 8,9% |
| 2 jun 2026 | Improper Authentication | Kernel | Alto 7,8 | 5,5% |
| 1 may 2026 | Incorrect Resource Transfer Between Spheres | Kernel | Alto 7,8 | 98% |
| 26 ene 2026 | Integer Overflow | Kernel | Alto 7,8 | 15% |
Fuentes: Known Exploited Vulnerabilities (CISA, dominio público), CVE records (cve.org) y EPSS (FIRST). La probabilidad de ataque es la estimación EPSS de que alguien intente explotar el fallo en los próximos 30 días.