307 lines
16 KiB
JSON
307 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40220",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.180Z",
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"datePublished": "2025-12-04T14:50:44.108Z",
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"dateUpdated": "2026-05-23T16:01:42.651Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-23T16:01:42.651Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix livelock in synchronous file put from fuseblk workers\n\nI observed a hang when running generic/323 against a fuseblk server.\nThis test opens a file, initiates a lot of AIO writes to that file\ndescriptor, and closes the file descriptor before the writes complete.\nUnsurprisingly, the AIO exerciser threads are mostly stuck waiting for\nresponses from the fuseblk server:\n\n# cat /proc/372265/task/372313/stack\n[<0>] request_wait_answer+0x1fe/0x2a0 [fuse]\n[<0>] __fuse_simple_request+0xd3/0x2b0 [fuse]\n[<0>] fuse_do_getattr+0xfc/0x1f0 [fuse]\n[<0>] fuse_file_read_iter+0xbe/0x1c0 [fuse]\n[<0>] aio_read+0x130/0x1e0\n[<0>] io_submit_one+0x542/0x860\n[<0>] __x64_sys_io_submit+0x98/0x1a0\n[<0>] do_syscall_64+0x37/0xf0\n[<0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nBut the /weird/ part is that the fuseblk server threads are waiting for\nresponses from itself:\n\n# cat /proc/372210/task/372232/stack\n[<0>] request_wait_answer+0x1fe/0x2a0 [fuse]\n[<0>] __fuse_simple_request+0xd3/0x2b0 [fuse]\n[<0>] fuse_file_put+0x9a/0xd0 [fuse]\n[<0>] fuse_release+0x36/0x50 [fuse]\n[<0>] __fput+0xec/0x2b0\n[<0>] task_work_run+0x55/0x90\n[<0>] syscall_exit_to_user_mode+0xe9/0x100\n[<0>] do_syscall_64+0x43/0xf0\n[<0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nThe fuseblk server is fuse2fs so there's nothing all that exciting in\nthe server itself. So why is the fuse server calling fuse_file_put?\nThe commit message for the fstest sheds some light on that:\n\n\"By closing the file descriptor before calling io_destroy, you pretty\nmuch guarantee that the last put on the ioctx will be done in interrupt\ncontext (during I/O completion).\n\nAha. AIO fgets a new struct file from the fd when it queues the ioctx.\nThe completion of the FUSE_WRITE command from userspace causes the fuse\nserver to call the AIO completion function. The completion puts the\nstruct file, queuing a delayed fput to the fuse server task. When the\nfuse server task returns to userspace, it has to run the delayed fput,\nwhich in the case of a fuseblk server, it does synchronously.\n\nSending the FUSE_RELEASE command sychronously from fuse server threads\nis a bad idea because a client program can initiate enough simultaneous\nAIOs such that all the fuse server threads end up in delayed_fput, and\nnow there aren't any threads left to handle the queued fuse commands.\n\nFix this by only using asynchronous fputs when closing files, and leave\na comment explaining why."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/fuse/file.c"
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],
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"versions": [
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{
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"version": "5a18ec176c934ca1bc9dc61580a5e0e90a9b5733",
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"lessThan": "548e1f2bac1d4df91a6138f26bb4ab00323fd948",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5a18ec176c934ca1bc9dc61580a5e0e90a9b5733",
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"lessThan": "cfd1aa3e2b71f3327cb373c45a897c9028c62b35",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5a18ec176c934ca1bc9dc61580a5e0e90a9b5733",
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"lessThan": "83b375c6efef69b1066ad2d79601221e7892745a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5a18ec176c934ca1bc9dc61580a5e0e90a9b5733",
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"lessThan": "bfd17b6138df0122a95989457d8e18ce0b86165e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5a18ec176c934ca1bc9dc61580a5e0e90a9b5733",
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"lessThan": "b26923512dbe57ae4917bafd31396d22a9d1691a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5a18ec176c934ca1bc9dc61580a5e0e90a9b5733",
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"lessThan": "f19a1390af448d9e193c08e28ea5f727bf3c3049",
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"status": "affected",
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},
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{
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"version": "5a18ec176c934ca1bc9dc61580a5e0e90a9b5733",
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"lessThan": "26e5c67deb2e1f42a951f022fdf5b9f7eb747b01",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9efe56738fecd591b5bf366a325440f9b457ebd6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5c46eb076e0a1b2c1769287cd6942e4594ade1b1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "83e6726210d6c815ce044437106c738eda5ff6f6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "23d154c71721fd0fa6199851078f32e6bd765664",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "ca3edc920f5fd7d8ac040caaf109f925c24620a0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2.6.32.32",
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"lessThan": "2.6.33",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "2.6.33.8",
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"lessThan": "2.6.34",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "2.6.34.10",
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"lessThan": "2.6.35",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "2.6.35.12",
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"lessThan": "2.6.36",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "2.6.37.3",
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"lessThan": "2.6.38",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/fuse/file.c"
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],
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"versions": [
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{
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"version": "2.6.38",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.38",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.246",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.196",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.158",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.115",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.54",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.4",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.38",
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"versionEndExcluding": "5.10.246"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/548e1f2bac1d4df91a6138f26bb4ab00323fd948"
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},
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{
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"url": "https://git.kernel.org/stable/c/cfd1aa3e2b71f3327cb373c45a897c9028c62b35"
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},
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{
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"url": "https://git.kernel.org/stable/c/83b375c6efef69b1066ad2d79601221e7892745a"
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},
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{
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"url": "https://git.kernel.org/stable/c/bfd17b6138df0122a95989457d8e18ce0b86165e"
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},
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{
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"url": "https://git.kernel.org/stable/c/b26923512dbe57ae4917bafd31396d22a9d1691a"
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},
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{
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"url": "https://git.kernel.org/stable/c/f19a1390af448d9e193c08e28ea5f727bf3c3049"
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},
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{
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"url": "https://git.kernel.org/stable/c/26e5c67deb2e1f42a951f022fdf5b9f7eb747b01"
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}
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],
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"title": "fuse: fix livelock in synchronous file put from fuseblk workers",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |