Use of Out-of-range Pointer Offset Affecting perf package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-PERF-20805439
- published11 Oct 2026
- disclosed6 Oct 2026
Introduced: 6 Oct 2026
NewCVE-2026-98273 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 perf.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
x86/kprobes: Fix crash when probing CS CALL instructions
When using eBPF to probe CS CALL instructions within a function, a crash can be triggered.
The eBPF tool probes offset 257 of the __hrtimer_run_queues() function:
<__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1) <__hrtimer_run_queues+254>: mov %r14,%rdi <__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12> <__hrtimer_run_queues+263>: mov %eax,%r12d <__hrtimer_run_queues+266>: xchg %ax,%ax <__hrtimer_run_queues+268>: mov %r13,%rdi
Which triggers this crash:
BUG: unable to handle page fault for address: 00000000000f41c9 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P RIP: 0010:__hrtimer_run_queues+0x106/0x230
Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is at the 6th byte of the above CS CALL instruction. Since the CS CALL instruction occupies 6 bytes, the exception occurred in the middle of that call instruction.
The root cause is that when using eBPF tools to probe in the middle of a function, a kprobe with INT3 is used as the underlying implementation.
During single-step emulation of the original CALL instruction, int3_emulate_call() assumes that the probed CALL instruction is 5 bytes long. However, the actual CS-prefixed CALL instruction occupies 6 bytes, so it constructs an incorrect exception return address. When the CPU returns from the kprobe handler, the next instruction to be executed is at the address of the last byte of that CS CALL instruction. Coincidentally, starting from that address, the CPU fetches and decodes a completely different instruction, which ultimately triggers a kernel crash.
Fix the issue by using the actual instruction length obtained from the instruction decoder when constructing the exception return address, rather than relying on the hardcoded CALL_INSN_SIZE macro.
[ mingo: Refined the changelog ]
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2546488
- https://access.redhat.com/security/cve/CVE-2026-98273
- https://git.kernel.org/stable/c/a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255
- https://git.kernel.org/stable/c/cfc1af3d054aaabee08f1f77c441b3533b082869
- https://git.kernel.org/stable/c/d8c6a18c0552135cbf0c696c9019b2979d0862c9