CVE-2026-74646

Summary

In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.

Take fl->lock around the move, matching every other fl->mmaps accessor.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux76e8e4ace1ed2c97dba3b1370e0e105e07c572bc < 3f265e405e5ef85030c3777262e18bb556bc8724affected
LinuxLinux76e8e4ace1ed2c97dba3b1370e0e105e07c572bc < a902fe1f80f58a2335b6be1131866f827ec44d1aaffected
LinuxLinux76e8e4ace1ed2c97dba3b1370e0e105e07c572bc < af6345159abcbaa550518f31990d2a9558c2d369affected
LinuxLinux76e8e4ace1ed2c97dba3b1370e0e105e07c572bc < efd02f8d1a7449f15809bc18d3cd41aafea75d7eaffected
LinuxLinux76e8e4ace1ed2c97dba3b1370e0e105e07c572bc < b85a0e91d7d6cd06a53c881a46f749cfcef416a2affected
LinuxLinux6.2affected
LinuxLinux0 < 6.2unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References