CVE-2025-39749 (GCVE-0-2025-39749)
Vulnerability from cvelistv5 – Published: 2025-09-11 16:52 – Updated: 2026-05-12 12:06
VLAI
EPSS
VEX
Title
rcu: Protect ->defer_qs_iw_pending from data race
Summary
In the Linux kernel, the following vulnerability has been resolved:
rcu: Protect ->defer_qs_iw_pending from data race
On kernels built with CONFIG_IRQ_WORK=y, when rcu_read_unlock() is
invoked within an interrupts-disabled region of code [1], it will invoke
rcu_read_unlock_special(), which uses an irq-work handler to force the
system to notice when the RCU read-side critical section actually ends.
That end won't happen until interrupts are enabled at the soonest.
In some kernels, such as those booted with rcutree.use_softirq=y, the
irq-work handler is used unconditionally.
The per-CPU rcu_data structure's ->defer_qs_iw_pending field is
updated by the irq-work handler and is both read and updated by
rcu_read_unlock_special(). This resulted in the following KCSAN splat:
------------------------------------------------------------------------
BUG: KCSAN: data-race in rcu_preempt_deferred_qs_handler / rcu_read_unlock_special
read to 0xffff96b95f42d8d8 of 1 bytes by task 90 on cpu 8:
rcu_read_unlock_special+0x175/0x260
__rcu_read_unlock+0x92/0xa0
rt_spin_unlock+0x9b/0xc0
__local_bh_enable+0x10d/0x170
__local_bh_enable_ip+0xfb/0x150
rcu_do_batch+0x595/0xc40
rcu_cpu_kthread+0x4e9/0x830
smpboot_thread_fn+0x24d/0x3b0
kthread+0x3bd/0x410
ret_from_fork+0x35/0x40
ret_from_fork_asm+0x1a/0x30
write to 0xffff96b95f42d8d8 of 1 bytes by task 88 on cpu 8:
rcu_preempt_deferred_qs_handler+0x1e/0x30
irq_work_single+0xaf/0x160
run_irq_workd+0x91/0xc0
smpboot_thread_fn+0x24d/0x3b0
kthread+0x3bd/0x410
ret_from_fork+0x35/0x40
ret_from_fork_asm+0x1a/0x30
no locks held by irq_work/8/88.
irq event stamp: 200272
hardirqs last enabled at (200272): [<ffffffffb0f56121>] finish_task_switch+0x131/0x320
hardirqs last disabled at (200271): [<ffffffffb25c7859>] __schedule+0x129/0xd70
softirqs last enabled at (0): [<ffffffffb0ee093f>] copy_process+0x4df/0x1cc0
softirqs last disabled at (0): [<0000000000000000>] 0x0
------------------------------------------------------------------------
The problem is that irq-work handlers run with interrupts enabled, which
means that rcu_preempt_deferred_qs_handler() could be interrupted,
and that interrupt handler might contain an RCU read-side critical
section, which might invoke rcu_read_unlock_special(). In the strict
KCSAN mode of operation used by RCU, this constitutes a data race on
the ->defer_qs_iw_pending field.
This commit therefore disables interrupts across the portion of the
rcu_preempt_deferred_qs_handler() that updates the ->defer_qs_iw_pending
field. This suffices because this handler is not a fast path.
Severity
7.0 (High)
Assigner
References
12 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0864f057b050bc6dd68106b3185e02db5140012d , < 74f58f382a7c8333f8d09701aefaa25913bdbe0e
(git)
Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < f937759c7432d6151b73e1393b6517661813d506 (git) Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < 0ad84d62217488e679ecc90e8628980dcc003de3 (git) Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < b5de8d80b5d049f051b95d9b1ee50ae4ab656124 (git) Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < b55947b725f190396f475d5d0c59aa855a4d8895 (git) Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < e35e711c78c8a4c43330c0dcb1c4d507a19c20f4 (git) Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < 90de9c94ea72327cfa9c2c9f6113c23a513af60b (git) Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < 55e11f6776798b27cf09a7aa0d718415d4fc9cf5 (git) Affected: 0864f057b050bc6dd68106b3185e02db5140012d , < 90c09d57caeca94e6f3f87c49e96a91edd40cbfd (git) |
guessed | |
| Linux | Linux |
Affected:
5.3
Unaffected: 0 , < 5.3 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.149 , ≤ 6.1.* (semver) Unaffected: 6.6.103 , ≤ 6.6.* (semver) Unaffected: 6.12.43 , ≤ 6.12.* (semver) Unaffected: 6.15.11 , ≤ 6.15.* (semver) Unaffected: 6.16.2 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu: Protect -\u003edefer_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\u0027t 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\u0027s -\u003edefer_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): [\u003cffffffffb0f56121\u003e] finish_task_switch+0x131/0x320\nhardirqs last disabled at (200271): [\u003cffffffffb25c7859\u003e] __schedule+0x129/0xd70\nsoftirqs last enabled at (0): [\u003cffffffffb0ee093f\u003e] copy_process+0x4df/0x1cc0\nsoftirqs last disabled at (0): [\u003c0000000000000000\u003e] 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 -\u003edefer_qs_iw_pending field.\n\nThis commit therefore disables interrupts across the portion of the\nrcu_preempt_deferred_qs_handler() that updates the -\u003edefer_qs_iw_pending\nfield. This suffices because this handler is not a fast path."
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"cveId": "CVE-2025-39749",
"datePublished": "2025-09-11T16:52:21.228Z",
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"title": "rcu: Protect -\u003edefer_qs_iw_pending from data race",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39749.json",
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"nvd": "{\"cve\":{\"id\":\"CVE-2025-39749\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-11T17:15:38.430\",\"lastModified\":\"2026-06-17T09:18:24.257\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrcu: Protect -\u003edefer_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\u0027t 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\u0027s -\u003edefer_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): [\u003cffffffffb0f56121\u003e] finish_task_switch+0x131/0x320\\nhardirqs last disabled at (200271): [\u003cffffffffb25c7859\u003e] __schedule+0x129/0xd70\\nsoftirqs last enabled at (0): [\u003cffffffffb0ee093f\u003e] copy_process+0x4df/0x1cc0\\nsoftirqs last disabled at (0): [\u003c0000000000000000\u003e] 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 -\u003edefer_qs_iw_pending field.\\n\\nThis commit therefore disables interrupts across the portion of the\\nrcu_preempt_deferred_qs_handler() that updates the -\u003edefer_qs_iw_pending\\nfield. This suffices because this handler is not a fast path.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/rcu/tree_plugin.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"74f58f382a7c8333f8d09701aefaa25913bdbe0e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"f937759c7432d6151b73e1393b6517661813d506\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"0ad84d62217488e679ecc90e8628980dcc003de3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"b5de8d80b5d049f051b95d9b1ee50ae4ab656124\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"b55947b725f190396f475d5d0c59aa855a4d8895\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"e35e711c78c8a4c43330c0dcb1c4d507a19c20f4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"90de9c94ea72327cfa9c2c9f6113c23a513af60b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"55e11f6776798b27cf09a7aa0d718415d4fc9cf5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0864f057b050bc6dd68106b3185e02db5140012d\",\"lessThan\":\"90c09d57caeca94e6f3f87c49e96a91edd40cbfd\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/rcu/tree_plugin.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.297\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.241\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.190\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.149\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.103\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.43\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.11\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.2\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC CN 4100\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"V5.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3\",\"versionEndExcluding\":\"5.4.297\",\"matchCriteriaId\":\"538D3537-72E6-42E8-A0ED-F5274403F0C4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"D0D21C35-EB8A-488A-BBF9-403E4817E5DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"AD9E597F-3DDE-4D7E-976C-463D0611F13F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.149\",\"matchCriteriaId\":\"FDBE8280-8983-4D2D-943D-2E6D0104E2D8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.103\",\"matchCriteriaId\":\"F2293654-7169-49B5-8D0D-EE51EF8B8E48\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.43\",\"matchCriteriaId\":\"472C5F87-2BF3-4FAB-9B21-DA7513977363\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.11\",\"matchCriteriaId\":\"BC242347-F722-43AE-B910-BE0B22386977\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.16\",\"versionEndExcluding\":\"6.16.2\",\"matchCriteriaId\":\"BD7C087D-2415-4521-B624-30003352F899\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ad84d62217488e679ecc90e8628980dcc003de3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55e11f6776798b27cf09a7aa0d718415d4fc9cf5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/74f58f382a7c8333f8d09701aefaa25913bdbe0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/90c09d57caeca94e6f3f87c49e96a91edd40cbfd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/90de9c94ea72327cfa9c2c9f6113c23a513af60b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b55947b725f190396f475d5d0c59aa855a4d8895\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b5de8d80b5d049f051b95d9b1ee50ae4ab656124\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e35e711c78c8a4c43330c0dcb1c4d507a19c20f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f937759c7432d6151b73e1393b6517661813d506\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-30T10:23:25+00:00",
"cve": "CVE-2025-39749",
"id": "CVE-2025-39749",
"initial_release_date": "2025-09-11T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: rcu: Protect -\u003edefer_qs_iw_pending from data race",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39749.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-29T01:17:05Z",
"cve": "CVE-2025-39749",
"id": "CVE-2025-39749",
"initial_release_date": "2025-09-11T23:24:20Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "594",
"product_status:known_not_affected": "187",
"product_status:recommended": "464",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-39749",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39749.json",
"version": "43"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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