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vuln-cve/data/2025/39xxx/CVE-2025-39749.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-39749",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.125Z",
"datePublished": "2025-09-11T16:52:21.228Z",
"dateUpdated": "2026-05-12T12:06:44.240Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T21:35:32.172Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu: Protect ->defer_qs_iw_pending from data race\n\nOn kernels built with CONFIG_IRQ_WORK=y, when rcu_read_unlock() is\ninvoked within an interrupts-disabled region of code [1], it will invoke\nrcu_read_unlock_special(), which uses an irq-work handler to force the\nsystem to notice when the RCU read-side critical section actually ends.\nThat end won't happen until interrupts are enabled at the soonest.\n\nIn some kernels, such as those booted with rcutree.use_softirq=y, the\nirq-work handler is used unconditionally.\n\nThe per-CPU rcu_data structure's ->defer_qs_iw_pending field is\nupdated by the irq-work handler and is both read and updated by\nrcu_read_unlock_special(). This resulted in the following KCSAN splat:\n\n------------------------------------------------------------------------\n\nBUG: KCSAN: data-race in rcu_preempt_deferred_qs_handler / rcu_read_unlock_special\n\nread to 0xffff96b95f42d8d8 of 1 bytes by task 90 on cpu 8:\n rcu_read_unlock_special+0x175/0x260\n __rcu_read_unlock+0x92/0xa0\n rt_spin_unlock+0x9b/0xc0\n __local_bh_enable+0x10d/0x170\n __local_bh_enable_ip+0xfb/0x150\n rcu_do_batch+0x595/0xc40\n rcu_cpu_kthread+0x4e9/0x830\n smpboot_thread_fn+0x24d/0x3b0\n kthread+0x3bd/0x410\n ret_from_fork+0x35/0x40\n ret_from_fork_asm+0x1a/0x30\n\nwrite to 0xffff96b95f42d8d8 of 1 bytes by task 88 on cpu 8:\n rcu_preempt_deferred_qs_handler+0x1e/0x30\n irq_work_single+0xaf/0x160\n run_irq_workd+0x91/0xc0\n smpboot_thread_fn+0x24d/0x3b0\n kthread+0x3bd/0x410\n ret_from_fork+0x35/0x40\n ret_from_fork_asm+0x1a/0x30\n\nno locks held by irq_work/8/88.\nirq event stamp: 200272\nhardirqs last enabled at (200272): [<ffffffffb0f56121>] finish_task_switch+0x131/0x320\nhardirqs last disabled at (200271): [<ffffffffb25c7859>] __schedule+0x129/0xd70\nsoftirqs last enabled at (0): [<ffffffffb0ee093f>] copy_process+0x4df/0x1cc0\nsoftirqs last disabled at (0): [<0000000000000000>] 0x0\n\n------------------------------------------------------------------------\n\nThe problem is that irq-work handlers run with interrupts enabled, which\nmeans that rcu_preempt_deferred_qs_handler() could be interrupted,\nand that interrupt handler might contain an RCU read-side critical\nsection, which might invoke rcu_read_unlock_special(). In the strict\nKCSAN mode of operation used by RCU, this constitutes a data race on\nthe ->defer_qs_iw_pending field.\n\nThis commit therefore disables interrupts across the portion of the\nrcu_preempt_deferred_qs_handler() that updates the ->defer_qs_iw_pending\nfield. This suffices because this handler is not a fast path."
}
],
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{
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/rcu/tree_plugin.h"
],
"versions": [
{
"version": "0864f057b050bc6dd68106b3185e02db5140012d",
"lessThan": "74f58f382a7c8333f8d09701aefaa25913bdbe0e",
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"lessThan": "f937759c7432d6151b73e1393b6517661813d506",
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{
"version": "0864f057b050bc6dd68106b3185e02db5140012d",
"lessThan": "0ad84d62217488e679ecc90e8628980dcc003de3",
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{
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"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
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"status": "affected"
},
{
"version": "0",
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"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.297",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
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},
{
"version": "5.10.241",
"lessThanOrEqual": "5.10.*",
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},
{
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"lessThanOrEqual": "5.15.*",
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},
{
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},
{
"version": "6.6.103",
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"status": "unaffected",
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},
{
"version": "6.12.43",
"lessThanOrEqual": "6.12.*",
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},
{
"version": "6.15.11",
"lessThanOrEqual": "6.15.*",
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},
{
"version": "6.16.2",
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
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},
{
"version": "6.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"vulnerable": true,
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"references": [
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"url": "https://git.kernel.org/stable/c/74f58f382a7c8333f8d09701aefaa25913bdbe0e"
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"url": "https://git.kernel.org/stable/c/f937759c7432d6151b73e1393b6517661813d506"
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"url": "https://git.kernel.org/stable/c/0ad84d62217488e679ecc90e8628980dcc003de3"
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{
"url": "https://git.kernel.org/stable/c/55e11f6776798b27cf09a7aa0d718415d4fc9cf5"
},
{
"url": "https://git.kernel.org/stable/c/90c09d57caeca94e6f3f87c49e96a91edd40cbfd"
}
],
"title": "rcu: Protect ->defer_qs_iw_pending from data race",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
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"providerMetadata": {
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"shortName": "CVE",
"dateUpdated": "2025-11-03T17:43:01.289Z"
}
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"shortName": "siemens-SADP",
"dateUpdated": "2026-05-12T12:06:44.240Z"
},
"affected": [
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"vendor": "Siemens",
"product": "SIMATIC CN 4100",
"versions": [
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],
"references": [
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}
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]
}
}
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