CVE-2023-3640

SCTF2023kernelpwn SCTF 2023 kernel pwn 题外话：打个广告 笔者是2024届毕业本科学生，参加今年秋招，欢迎联系 sycrop 这道题想考察的是两个点。 1. cpu entry area mapping区域的起始点有几个和内核text段偏移固定的地址，具体参考下图，这只是一个小trick，首次出现在谷歌的KCTF，后面在国际赛中出现过几次 1. 通过下硬件断点在用户态触发的方式，可以将寄存器内容推送到与per cpu entry area固定偏移的DB stack上，而在linux 6.2之前， per cpu entry...

CVE-2026-80963

A flaw was found in the Linux kernel's dm-stats module. This vulnerability occurs when the allocation of per-CPU data fails, which can lead to a null pointer dereference during the subsequent cleanup operation. This issue can cause the system to crash, resulting in a Denial of Service DoS...

CVE-2026-89581

A flaw was found in the Linux kernel's handling of Berkeley Packet Filter BPF programs on x86 architecture. An issue with how per-CPU addresses are resolved into extended registers can lead to incorrect memory access. A local attacker could exploit this by running a specially crafted BPF program...

CVE-2026-89547

A flaw was found in the Linux kernel's SUNRPC component. A local administrator, under specific conditions of memory pressure or fault injection during RPC server startup, can trigger a failure in per-CPU counter allocation. This failure leads to uninitialized counters, which, when subsequently...

CVE-2026-89581

In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix per-CPU address resolution into an extended register The destination of the per-CPU address MOV is encoded in ModRM.reg, which is extended by REX.R, but the REX prefix is built with add1mod, which sets REX.B. REX.B...

CVE-2026-89580

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable preemption in bpfgetstack getperfcallchain returns a per-CPU perfcallchainentry buffer and releases its recursion slot via putcallchainentry before returning, so nothing keeps the entry reserved while bpfgetstack...

CVE-2026-89459

In the Linux kernel, the following vulnerability has been resolved: s390/percpu: Fix MVIYPERCPU with older binutils Commit a737737cdb9c "s390/percpu: Infrastructure for more efficient thiscpu operations" introduced MVIYPERCPU, which stringifies arguments that are already C string literals. This...

CVE-2026-80963

In the Linux kernel, the following vulnerability has been resolved: dm-stats: fix a crash if allocation of per-cpu data fails If "dmkvzallocpercpuallocsize, cputonodecpu" fails, the code jumps to the "out" label and calls dmstatfree. dmstatfree does "foreachpossiblecpucpu...

CVE-2026-89581

CVE-2026-89581 is a Linux kernel BPF x86 backend bug where the REX prefix is incorrectly built with add_1mod() (setting REX.B) instead of add_2mod() (setting REX.R) when encoding per-CPU address MOV instructions targeting extended registers (R5, R7, R8, R9). The lost high register bit causes reso...

EUVD-2026-76493

In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix per-CPU address resolution into an extended register The destination of the per-CPU address MOV is encoded in ModRM.reg, which is extended by REX.R, but the REX prefix is built with add1mod, which sets REX.B. REX.B...

CVE-2026-89581 bpf, x86: Fix per-CPU address resolution into an extended register

In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix per-CPU address resolution into an extended register The destination of the per-CPU address MOV is encoded in ModRM.reg, which is extended by REX.R, but the REX prefix is built with add1mod, which sets REX.B. REX.B...

EUVD-2026-76492

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable preemption in bpfgetstack getperfcallchain returns a per-CPU perfcallchainentry buffer and releases its recursion slot via putcallchainentry before returning, so nothing keeps the entry reserved while bpfgetstack...

CVE-2026-89580

CVE-2026-89580 affects the Linux kernel BPF subsystem, specifically __bpf_get_stack(). The root cause is a preemption race : a preemptible BPF program (e.g., a non-sleepable raw tracepoint on a PREEMPT kernel) can be scheduled out between obtaining a per-CPU perf_callchain_entry buffer and copyin...

CVE-2026-89580 bpf: Disable preemption in __bpf_get_stack

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable preemption in bpfgetstack getperfcallchain returns a per-CPU perfcallchainentry buffer and releases its recursion slot via putcallchainentry before returning, so nothing keeps the entry reserved while bpfgetstack...

CVE-2026-89459

CVE-2026-89459 affects the Linux kernel on s390 architecture. The MVIY_PERCPU() macro, introduced in commit a737737cdb9c, stringifies C string literals producing assembler invocations like GEN_MVIY "459712" "%r3". With binutils prior to 2.39 , the separating whitespace between quoted macro argume...

CVE-2026-89459 s390/percpu: Fix MVIY_PERCPU() with older binutils

In the Linux kernel, the following vulnerability has been resolved: s390/percpu: Fix MVIYPERCPU with older binutils Commit a737737cdb9c "s390/percpu: Infrastructure for more efficient thiscpu operations" introduced MVIYPERCPU, which stringifies arguments that are already C string literals. This...

CVE-2026-80963 dm-stats: fix a crash if allocation of per-cpu data fails

In the Linux kernel, the following vulnerability has been resolved: dm-stats: fix a crash if allocation of per-cpu data fails If "dmkvzallocpercpuallocsize, cputonodecpu" fails, the code jumps to the "out" label and calls dmstatfree. dmstatfree does "foreachpossiblecpucpu...

CVE-2026-80963

CVE-2026-80963 affects the Linux kernel 's dm-stats module (device-mapper statistics). The root cause is a NULL pointer dereference in the dm_stat_free function: when the per-CPU allocation via dm_kvzalloc fails, execution jumps to an error path that calls dm_stat_free, which iterates over all po...

EUVD-2026-76286

In the Linux kernel, the following vulnerability has been resolved: dm-stats: fix a crash if allocation of per-cpu data fails If "dmkvzallocpercpuallocsize, cputonodecpu" fails, the code jumps to the "out" label and calls dmstatfree. dmstatfree does "foreachpossiblecpucpu...

PT-2026-90175

In the Linux kernel, the following vulnerability has been resolved: s390/percpu: Fix MVIY PERCPU with older binutils Commit a737737cdb9c "s390/percpu: Infrastructure for more efficient this cpu operations" introduced MVIY PERCPU, which stringifies arguments that are already C string literals. Thi...