CVE-2025-37753 Information

May 02, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

s390/cpumf: Fix double free on error in cpumf_pmu_event_init()

In PMU event initialization functions

  • cpumsf_pmu_event_init()
  • cpumf_pmu_event_init()
  • cfdiag_event_init() the partially created event had to be removed when an error was detected. The event::event_init() member function had to release all resources it allocated in case of error. event::destroy() had to be called on freeing an event after it was successfully created and event::event_init() returned success.

With

commit c70ca298036c (\perf/core: Simplify the perf_event_alloc() error path)

this is not necessary anymore. The performance subsystem common code now always calls event::destroy() to clean up the allocated resources created during event initialization.

Remove the event::destroy() invocation in PMU event initialization or that function is called twice for each event that runs into an error condition in event creation.

This is the kernel log entry which shows up without the fix:

————[ cut here ]———— refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 43388 at lib/refcount.c:87 refcount_dec_not_one+0x74/0x90 CPU: 0 UID: 0 PID: 43388 Comm: perf Not tainted 6.15.0-20250407.rc1.git0.300.fc41.s390x+git 1 NONE Hardware name: IBM 3931 A01 704 (LPAR) Krnl PSW : 0704c00180000000 00000209cb2c1b88 (refcount_dec_not_one+0x78/0x90) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3 Krnl GPRS: 0000020900000027 0000020900000023 0000000000000026 0000018900000000 00000004a2200a00 0000000000000000 0000000000000057 ffffffffffffffea 00000002b386c600 00000002b3f5b3e0 00000209cc51f140 00000209cc7fc550 0000000001449d38 ffffffffffffffff 00000209cb2c1b84 00000189d67dfb80 Krnl Code: 00000209cb2c1b78: c02000506727 larl %r200000209cbcce9c6 00000209cb2c1b7e: c0e5ffbd4431 brasl %r1400000209caa6a3e0 00000209cb2c1b84: af000000 mc 00 >00000209cb2c1b88: a7480001 lhi %r41 00000209cb2c1b8c: ebeff0a00004 lmg %r14%r15160(%r15) 00000209cb2c1b92: ec243fbf0055 risbg %r2%r4631910 00000209cb2c1b98: 07fe bcr 15%r14 00000209cb2c1b9a: 47000700 bc 01792 Call Trace: [<00000209cb2c1b88>] refcount_dec_not_one+0x78/0x90 [<00000209cb2c1dc4>] refcount_dec_and_mutex_lock+0x24/0x90 [<00000209caa3c29e>] hw_perf_event_destroy+0x2e/0x80 [<00000209cacaf8b4>] __free_event+0x74/0x270 [<00000209cacb47c4>] perf_event_alloc.part.0+0x4a4/0x730 [<00000209cacbf3e8>] __do_sys_perf_event_open+0x248/0xc20 [<00000209cacc14a4>] __s390x_sys_perf_event_open+0x44/0x50 [<00000209cb8114de>] __do_syscall+0x12e/0x260 [<00000209cb81ce34>] system_call+0x74/0x98 Last Breaking-Event-Address: [<00000209caa6a4d2>] __warn_printk+0xf2/0x100 —[ end trace 0000000000000000 ]—

Reference

https://git.kernel.org/stable/c/3a3faf873db5dcd5d2622d8e2accb90af0a86c2d https://git.kernel.org/stable/c/aa1ac98268cd1f380c713f07e39b1fa1d5c7650c https://git.kernel.org/stable/c/bdbecb2bf531fadbbc9347a79009f7a58ea7eb03 https://git.kernel.org/stable/c/ddf60c1491102dab04491481bc3376d3e9cd139d

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