CVE-2023-52476
perf/x86/lbr: Filter vsyscall addresses
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/lbr: Filter vsyscall addresses
We found that a panic can occur when a vsyscall is made while LBR sampling
is active. If the vsyscall is interrupted (NMI) for perf sampling, this
call sequence can occur (most recent at top):
__insn_get_emulate_prefix()
insn_get_emulate_prefix()
insn_get_prefixes()
insn_get_opcode()
decode_branch_type()
get_branch_type()
intel_pmu_lbr_filter()
intel_pmu_handle_irq()
perf_event_nmi_handler()
Within __insn_get_emulate_prefix() at frame 0, a macro is called:
peek_nbyte_next(insn_byte_t, insn, i)
Within this macro, this dereference occurs:
(insn)->next_byte
Inspecting registers at this point, the value of the next_byte field is the
address of the vsyscall made, for example the location of the vsyscall
version of gettimeofday() at 0xffffffffff600000. The access to an address
in the vsyscall region will trigger an oops due to an unhandled page fault.
To fix the bug, filtering for vsyscalls can be done when
determining the branch type. This patch will return
a "none" branch if a kernel address if found to lie in the
vsyscall region.
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: perf/x86/lbr: Filtrar direcciones vsyscall Descubrimos que puede ocurrir un pánico cuando se realiza una vsyscall mientras el muestreo LBR está activo. Si el VSYSCALL se interrumpe (NMI) para el muestreo de Perf, esta secuencia de llamadas puede ocurrir (más reciente en la parte superior): __insn_get_emulate_prefix () insn_get_emulate_prefix () insn_get_prefixes () insn_get_opcode () decode_branch_type () get_branch_type () _pmu_handle_irq () perf_event_nmi_handler ( ) Dentro de __insn_get_emulate_prefix() en el cuadro 0, se llama una macro: peek_nbyte_next(insn_byte_t, insn, i) Dentro de esta macro, se produce esta desreferencia: (insn)->next_byte Inspeccionando registros en este punto, el valor del campo next_byte es el dirección de vsyscall realizada, por ejemplo, la ubicación de la versión vsyscall de gettimeofday() en 0xffffffffff600000. El acceso a una dirección en la región vsyscall provocará un error debido a un error de página no controlado. Para corregir el error, se puede filtrar por vsyscalls al determinar el tipo de rama. Este parche devolverá una rama "ninguna" si se encuentra que una dirección del kernel se encuentra en la región vsyscall.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-20 CVE Reserved
- 2024-02-29 CVE Published
- 2024-02-29 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-404: Improper Resource Shutdown or Release
CAPEC
References (6)
URL | Tag | Source |
---|
URL | Date | SRC |
---|
URL | Date | SRC |
---|---|---|
https://access.redhat.com/security/cve/CVE-2023-52476 | 2024-09-24 | |
https://bugzilla.redhat.com/show_bug.cgi?id=2267041 | 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" | < 5.15.137 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.137" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 6.1.59 Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.59" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 6.5.8 Search vendor "Linux" for product "Linux Kernel" and version " < 6.5.8" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 6.6 Search vendor "Linux" for product "Linux Kernel" and version " < 6.6" | en |
Affected
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