{"id":"CVE-2025-39745","state":"PUBLISHED","title":"rcutorture: Fix rcutorture_one_extend_check() splat in RT kernels","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrcutorture: Fix rcutorture_one_extend_check() splat in RT kernels\n\nFor built with CONFIG_PREEMPT_RT=y kernels, running rcutorture\ntests resulted in the following splat:\n\n[   68.797425] rcutorture_one_extend_check during change: Current 0x1  To add 0x1  To remove 0x0  preempt_count() 0x0\n[   68.797533] WARNING: CPU: 2 PID: 512 at kernel/rcu/rcutorture.c:1993 rcutorture_one_extend_check+0x419/0x560 [rcutorture]\n[   68.797601] Call Trace:\n[   68.797602]  <TASK>\n[   68.797619]  ? lockdep_softirqs_off+0xa5/0x160\n[   68.797631]  rcutorture_one_extend+0x18e/0xcc0 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797646]  ? local_clock+0x19/0x40\n[   68.797659]  rcu_torture_one_read+0xf0/0x280 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797678]  ? __pfx_rcu_torture_one_read+0x10/0x10 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797804]  ? __pfx_rcu_torture_timer+0x10/0x10 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797815] rcu-torture: rcu_torture_reader task started\n[   68.797824] rcu-torture: Creating rcu_torture_reader task\n[   68.797824]  rcu_torture_reader+0x238/0x580 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797836]  ? kvm_sched_clock_read+0x15/0x30\n\nDisable BH does not change the SOFTIRQ corresponding bits in\npreempt_count() for RT kernels, this commit therefore use\nsoftirq_count() to check the if BH is disabled.","publishedAt":"2025-09-11T16:52:18.423Z","updatedAt":"2026-05-11T21:35:27.553Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ec9d6356bfda69abe5f4767dd56c964127913233","status":"affected","lessThan":"a85550267247cdf5e7499be00ea8e388ab014e50","versionType":"git"},{"version":"ec9d6356bfda69abe5f4767dd56c964127913233","status":"affected","lessThan":"69c5ae0f441c2d72e8f48dc1e08464c172360c4c","versionType":"git"},{"version":"ec9d6356bfda69abe5f4767dd56c964127913233","status":"affected","lessThan":"8d71351d88e478d3c4e945e3218e97ec677fd807","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/rcu/rcutorture.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.15.11","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16.2","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/rcu/rcutorture.c"]}],"references":["https://git.kernel.org/stable/c/a85550267247cdf5e7499be00ea8e388ab014e50","https://git.kernel.org/stable/c/69c5ae0f441c2d72e8f48dc1e08464c172360c4c","https://git.kernel.org/stable/c/8d71351d88e478d3c4e945e3218e97ec677fd807"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/39xxx/CVE-2025-39745.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39745","state":"PUBLISHED","datePublished":"2025-09-11T16:52:18.423Z","dateUpdated":"2026-05-11T21:35:27.553Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.120Z"},"containers":{"cna":{"title":"rcutorture: Fix rcutorture_one_extend_check() splat in RT kernels","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrcutorture: Fix rcutorture_one_extend_check() splat in RT kernels\n\nFor built with CONFIG_PREEMPT_RT=y kernels, running rcutorture\ntests resulted in the following splat:\n\n[   68.797425] rcutorture_one_extend_check during change: Current 0x1  To add 0x1  To remove 0x0  preempt_count() 0x0\n[   68.797533] WARNING: CPU: 2 PID: 512 at kernel/rcu/rcutorture.c:1993 rcutorture_one_extend_check+0x419/0x560 [rcutorture]\n[   68.797601] Call Trace:\n[   68.797602]  <TASK>\n[   68.797619]  ? lockdep_softirqs_off+0xa5/0x160\n[   68.797631]  rcutorture_one_extend+0x18e/0xcc0 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797646]  ? local_clock+0x19/0x40\n[   68.797659]  rcu_torture_one_read+0xf0/0x280 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797678]  ? __pfx_rcu_torture_one_read+0x10/0x10 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797804]  ? __pfx_rcu_torture_timer+0x10/0x10 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797815] rcu-torture: rcu_torture_reader task started\n[   68.797824] rcu-torture: Creating rcu_torture_reader task\n[   68.797824]  rcu_torture_reader+0x238/0x580 [rcutorture 2466dbd2ff34dbaa36049cb323a80c3306ac997c]\n[   68.797836]  ? kvm_sched_clock_read+0x15/0x30\n\nDisable BH does not change the SOFTIRQ corresponding bits in\npreempt_count() for RT kernels, this commit therefore use\nsoftirq_count() to check the if BH is disabled."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ec9d6356bfda69abe5f4767dd56c964127913233","status":"affected","lessThan":"a85550267247cdf5e7499be00ea8e388ab014e50","versionType":"git"},{"version":"ec9d6356bfda69abe5f4767dd56c964127913233","status":"affected","lessThan":"69c5ae0f441c2d72e8f48dc1e08464c172360c4c","versionType":"git"},{"version":"ec9d6356bfda69abe5f4767dd56c964127913233","status":"affected","lessThan":"8d71351d88e478d3c4e945e3218e97ec677fd807","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/rcu/rcutorture.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.15.11","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16.2","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/rcu/rcutorture.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a85550267247cdf5e7499be00ea8e388ab014e50"},{"url":"https://git.kernel.org/stable/c/69c5ae0f441c2d72e8f48dc1e08464c172360c4c"},{"url":"https://git.kernel.org/stable/c/8d71351d88e478d3c4e945e3218e97ec677fd807"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:35:27.553Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.15.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.16.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.17"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}