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Use of Uninitialized Resource The advisory has been revoked - it doesn't affect any version of package kernel-tools-libs-devel  (opens in a new tab)

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EPSS
0.2% (9th percentile)

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  • Snyk IDSNYK-CENTOS10-KERNELTOOLSLIBSDEVEL-20925370
  • published14 Oct 2026
  • disclosed17 Sept 2026
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Introduced: 17 Sep 2026

CVE-2026-90211  (opens in a new tab)
CWE-908  (opens in a new tab)

Amendment

The Centos security team deemed this advisory irrelevant for Centos:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-tools-libs-devel package and not the kernel-tools-libs-devel package as distributed by Centos.

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

bpf, s390: Clear fetch destination on faulting arena atomic

Same missing register clear as on riscv64. A RMW atomic on an arena pointer is converted to BPF_PROBE_ATOMIC and gets an exception table entry, but bpf_jit_probe_atomic_pre() only fills in the arena base and the probe offset, leaving probe->reg at the -1 that bpf_jit_probe_init() set, which bpf_jit_probe_post() writes into the entry and ex_handler_bpf() then reads back as "there is nothing to clear".

That is right for a plain BPF_{ADD,AND,OR,XOR}, which only writes memory, but an RMW carrying BPF_FETCH also reads the old value into a register: src_reg for BPF_{ADD,AND,OR,XOR} | BPF_FETCH and BPF_XCHG, and r0 for BPF_CMPXCHG. So on a fault over an unmapped arena page the program resumes at the landing pad with whatever that register held before the atomic instead of the 0 that every other BPF_PROBE_* access delivers.

Fill probe->reg in from bpf_atomic_load_reg(). Unlike x86-64 and arm64, s390x does not report arena violations from its exception handler, so there is no access direction to correct here, only the missing register clear.