CVE-2026-23134 (GCVE-0-2026-23134)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:14 – Updated: 2026-02-14 15:14
VLAI?
Title
slab: fix kmalloc_nolock() context check for PREEMPT_RT
Summary
In the Linux kernel, the following vulnerability has been resolved: slab: fix kmalloc_nolock() context check for PREEMPT_RT On PREEMPT_RT kernels, local_lock becomes a sleeping lock. The current check in kmalloc_nolock() only verifies we're not in NMI or hard IRQ context, but misses the case where preemption is disabled. When a BPF program runs from a tracepoint with preemption disabled (preempt_count > 0), kmalloc_nolock() proceeds to call local_lock_irqsave() which attempts to acquire a sleeping lock, triggering: BUG: sleeping function called from invalid context in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6128 preempt_count: 2, expected: 0 Fix this by checking !preemptible() on PREEMPT_RT, which directly expresses the constraint that we cannot take a sleeping lock when preemption is disabled. This encompasses the previous checks for NMI and hard IRQ contexts while also catching cases where preemption is disabled.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: af92793e52c3a99b828ed4bdd277fd3e11c18d08 , < f60ba4a97ae3f94e4818722ed2e4d260bbb17b44 (git)
Affected: af92793e52c3a99b828ed4bdd277fd3e11c18d08 , < 99a3e3a1cfc93b8fe318c0a3a5cfb01f1d4ad53c (git)
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    Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslab: fix kmalloc_nolock() context check for PREEMPT_RT\n\nOn PREEMPT_RT kernels, local_lock becomes a sleeping lock. The current\ncheck in kmalloc_nolock() only verifies we\u0027re not in NMI or hard IRQ\ncontext, but misses the case where preemption is disabled.\n\nWhen a BPF program runs from a tracepoint with preemption disabled\n(preempt_count \u003e 0), kmalloc_nolock() proceeds to call\nlocal_lock_irqsave() which attempts to acquire a sleeping lock,\ntriggering:\n\n  BUG: sleeping function called from invalid context\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6128\n  preempt_count: 2, expected: 0\n\nFix this by checking !preemptible() on PREEMPT_RT, which directly\nexpresses the constraint that we cannot take a sleeping lock when\npreemption is disabled. This encompasses the previous checks for NMI\nand hard IRQ contexts while also catching cases where preemption is\ndisabled."
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        "dateUpdated": "2026-02-14T15:14:33.806Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/99a3e3a1cfc93b8fe318c0a3a5cfb01f1d4ad53c"
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    "cveId": "CVE-2026-23134",
    "datePublished": "2026-02-14T15:14:33.806Z",
    "dateReserved": "2026-01-13T15:37:45.971Z",
    "dateUpdated": "2026-02-14T15:14:33.806Z",
    "state": "PUBLISHED"
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  }
}


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