{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-53216", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-53216", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-12-27T13:50:01.869Z", "updatedAt": "2026-08-05T11:44:41.267Z", "importedAt": "2026-10-24T01:57:20.494Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "nfsd: release svc_expkey/svc_export with rcu_work", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: release svc_expkey/svc_export with rcu_work\n\nThe last reference for `cache_head` can be reduced to zero in `c_show`\nand `e_show`(using `rcu_read_lock` and `rcu_read_unlock`). Consequently,\n`svc_export_put` and `expkey_put` will be invoked, leading to two\nissues:\n\n1. The `svc_export_put` will directly free ex_uuid. However,\n `e_show`/`c_show` will access `ex_uuid` after `cache_put`, which can\n trigger a use-after-free issue, shown below.\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in svc_export_show+0x362/0x430 [nfsd]\n Read of size 1 at addr ff11000010fdc120 by task cat/870\n\n CPU: 1 UID: 0 PID: 870 Comm: cat Not tainted 6.12.0-rc3+ #1\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n 1.16.1-2.fc37 04/01/2014\n Call Trace:\n \n dump_stack_lvl+0x53/0x70\n print_address_description.constprop.0+0x2c/0x3a0\n print_report+0xb9/0x280\n kasan_report+0xae/0xe0\n svc_export_show+0x362/0x430 [nfsd]\n c_show+0x161/0x390 [sunrpc]\n seq_read_iter+0x589/0x770\n seq_read+0x1e5/0x270\n proc_reg_read+0xe1/0x140\n vfs_read+0x125/0x530\n ksys_read+0xc1/0x160\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n Allocated by task 830:\n kasan_save_stack+0x20/0x40\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x8f/0xa0\n __kmalloc_node_track_caller_noprof+0x1bc/0x400\n kmemdup_noprof+0x22/0x50\n svc_export_parse+0x8a9/0xb80 [nfsd]\n cache_do_downcall+0x71/0xa0 [sunrpc]\n cache_write_procfs+0x8e/0xd0 [sunrpc]\n proc_reg_write+0xe1/0x140\n vfs_write+0x1a5/0x6d0\n ksys_write+0xc1/0x160\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n Freed by task 868:\n kasan_save_stack+0x20/0x40\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x37/0x50\n kfree+0xf3/0x3e0\n svc_export_put+0x87/0xb0 [nfsd]\n cache_purge+0x17f/0x1f0 [sunrpc]\n nfsd_destroy_serv+0x226/0x2d0 [nfsd]\n nfsd_svc+0x125/0x1e0 [nfsd]\n write_threads+0x16a/0x2a0 [nfsd]\n nfsctl_transaction_write+0x74/0xa0 [nfsd]\n vfs_write+0x1a5/0x6d0\n ksys_write+0xc1/0x160\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n2. We cannot sleep while using `rcu_read_lock`/`rcu_read_unlock`.\n However, `svc_export_put`/`expkey_put` will call path_put, which\n subsequently triggers a sleeping operation due to the following\n `dput`.\n\n =============================\n WARNING: suspicious RCU usage\n 5.10.0-dirty #141 Not tainted\n -----------------------------\n ...\n Call Trace:\n dump_stack+0x9a/0xd0\n ___might_sleep+0x231/0x240\n dput+0x39/0x600\n path_put+0x1b/0x30\n svc_export_put+0x17/0x80\n e_show+0x1c9/0x200\n seq_read_iter+0x63f/0x7c0\n seq_read+0x226/0x2d0\n vfs_read+0x113/0x2c0\n ksys_read+0xc9/0x170\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x67/0xd1\n\nFix these issues by using `rcu_work` to help release\n`svc_expkey`/`svc_export`. This approach allows for an asynchronous\ncontext to invoke `path_put` and also facilitates the freeing of\n`uuid/exp/key` after an RCU grace period.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "9ceddd9da13434a5906255c0fc528c385aded283", "status": "affected", "versionType": "git", "lessThan": "bd8524148dd8c123334b066faa90590ba2ef8e6f" }, { "version": "9ceddd9da13434a5906255c0fc528c385aded283", "status": "affected", "versionType": "git", "lessThan": "2e4854599200f4d021df8ae17e69221d7c149f3e" }, { "version": "9ceddd9da13434a5906255c0fc528c385aded283", "status": "affected", "versionType": "git", "lessThan": "ad4363a24a5746b257c0beb5d8cc68f9b62c173f" }, { "version": "9ceddd9da13434a5906255c0fc528c385aded283", "status": "affected", "versionType": "git", "lessThan": "f8c989a0c89a75d30f899a7cabdc14d72522bb8d" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.20" }, { "version": "6.6.64", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.11.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.11.*" }, { "version": "6.12.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.13", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }