{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39866","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.143Z","datePublished":"2025-09-19T15:26:35.725Z","dateUpdated":"2026-05-12T12:07:45.858Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:37:57.433Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: writeback: fix use-after-free in __mark_inode_dirty()\n\nAn use-after-free issue occurred when __mark_inode_dirty() get the\nbdi_writeback that was in the progress of switching.\n\nCPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nCall trace:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nRoot cause is:\n\nsystemd-random-seed                         kworker\n----------------------------------------------------------------------\n___mark_inode_dirty                     inode_switch_wbs_work_fn\n\n  spin_lock(&inode->i_lock);\n  inode_attach_wb\n  locked_inode_to_wb_and_lock_list\n     get inode->i_wb\n     spin_unlock(&inode->i_lock);\n     spin_lock(&wb->list_lock)\n  spin_lock(&inode->i_lock)\n  inode_io_list_move_locked\n  spin_unlock(&wb->list_lock)\n  spin_unlock(&inode->i_lock)\n                                    spin_lock(&old_wb->list_lock)\n                                      inode_do_switch_wbs\n                                        spin_lock(&inode->i_lock)\n                                        inode->i_wb = new_wb\n                                        spin_unlock(&inode->i_lock)\n                                    spin_unlock(&old_wb->list_lock)\n                                    wb_put_many(old_wb, nr_switched)\n                                      cgwb_release\n                                      old wb released\n  wb_wakeup_delayed() accesses wb,\n  then trigger the use-after-free\n  issue\n\nFix this race condition by holding inode spinlock until\nwb_wakeup_delayed() finished."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fs-writeback.c"],"versions":[{"version":"0747259d13febfcc838980a63c414c9b920cea6f","lessThan":"e2a14bbae5d8bacaa301362744a110e2be40a3a3","status":"affected","versionType":"git"},{"version":"0747259d13febfcc838980a63c414c9b920cea6f","lessThan":"b187c976111960e6e54a6b1fff724f6e3d39406c","status":"affected","versionType":"git"},{"version":"0747259d13febfcc838980a63c414c9b920cea6f","lessThan":"1edc2feb9c759a9883dfe81cb5ed231412d8b2e4","status":"affected","versionType":"git"},{"version":"0747259d13febfcc838980a63c414c9b920cea6f","lessThan":"bf89b1f87c72df79cf76203f71fbf8349cd5c9de","status":"affected","versionType":"git"},{"version":"0747259d13febfcc838980a63c414c9b920cea6f","lessThan":"e63052921f1b25a836feb1500b841bff7a4a0456","status":"affected","versionType":"git"},{"version":"0747259d13febfcc838980a63c414c9b920cea6f","lessThan":"c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a","status":"affected","versionType":"git"},{"version":"0747259d13febfcc838980a63c414c9b920cea6f","lessThan":"d02d2c98d25793902f65803ab853b592c7a96b29","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/fs-writeback.c"],"versions":[{"version":"4.2","status":"affected"},{"version":"0","lessThan":"4.2","status":"unaffected","versionType":"semver"},{"version":"5.10.247","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.192","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.151","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.105","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.46","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.16.6","lessThanOrEqual":"6.16.*","status":"unaffected","versionType":"semver"},{"version":"6.17","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.10.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.15.192"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.1.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.16.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.17"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e2a14bbae5d8bacaa301362744a110e2be40a3a3"},{"url":"https://git.kernel.org/stable/c/b187c976111960e6e54a6b1fff724f6e3d39406c"},{"url":"https://git.kernel.org/stable/c/1edc2feb9c759a9883dfe81cb5ed231412d8b2e4"},{"url":"https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9de"},{"url":"https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456"},{"url":"https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a"},{"url":"https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29"}],"title":"fs: writeback: fix use-after-free in __mark_inode_dirty()","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"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T17:44:17.299Z"}},{"x_adpType":"supplier","providerMetadata":{"orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP","dateUpdated":"2026-05-12T12:07:45.858Z"},"affected":[{"vendor":"Siemens","product":"SIMATIC CN 4100","versions":[{"status":"affected","version":"0","lessThan":"V5.0","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.5","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP 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