CVE-2024-50121— nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 17
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 2bbf10861d51dae76c6da7113516d0071c782653< f67138dd338cb564ade7d3755c8cd4f68b46d397 | affected |
958294a3eb82026fcfff20b0287a90e9c854785e< 5ade4382de16c34d9259cb548f36ec5c4555913c | affected | ||
f3ea5ec83d1a827f074b2b660749817e0bf2b23e< 36775f42e039b01d4abe8998bf66771a37d3cdcc | affected | ||
7c24fa225081f31bc6da6a355c1ba801889ab29a< f965dc0f099a54fca100acf6909abe52d0c85328 | affected | ||
7c24fa225081f31bc6da6a355c1ba801889ab29a< add1df5eba163a3a6ece11cb85890e2e410baaea | affected | ||
7c24fa225081f31bc6da6a355c1ba801889ab29a< d5ff2fb2e7167e9483846e34148e60c0c016a1f6 | affected | ||
5.10.220< 5.10.233 | affected | ||
5.15.154< 5.15.176 | affected | ||
| … +9 more rows | |||
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I. Basic Information for CVE-2024-50121
Vulnerability Information
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Vulnerability Title
nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net In the normal case, when we excute `echo 0 > /proc/fs/nfsd/threads`, the function `nfs4_state_destroy_net` in `nfs4_state_shutdown_net` will release all resources related to the hashed `nfs4_client`. If the `nfsd_client_shrinker` is running concurrently, the `expire_client` function will first unhash this client and then destroy it. This can lead to the following warning. Additionally, numerous use-after-free errors may occur as well. nfsd_client_shrinker echo 0 > /proc/fs/nfsd/threads expire_client nfsd_shutdown_net unhash_client ... nfs4_state_shutdown_net /* won't wait shrinker exit */ /* cancel_work(&nn->nfsd_shrinker_work) * nfsd_file for this /* won't destroy unhashed client1 */ * client1 still alive nfs4_state_destroy_net */ nfsd_file_cache_shutdown /* trigger warning */ kmem_cache_destroy(nfsd_file_slab) kmem_cache_destroy(nfsd_file_mark_slab) /* release nfsd_file and mark */ __destroy_client ==================================================================== BUG nfsd_file (Not tainted): Objects remaining in nfsd_file on __kmem_cache_shutdown() -------------------------------------------------------------------- CPU: 4 UID: 0 PID: 764 Comm: sh Not tainted 6.12.0-rc3+ #1 dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xac/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e ==================================================================== BUG nfsd_file_mark (Tainted: G B W ): Objects remaining nfsd_file_mark on __kmem_cache_shutdown() -------------------------------------------------------------------- dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xc8/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e To resolve this issue, cancel `nfsd_shrinker_work` using synchronous mode in nfs4_state_shutdown_net.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nfsd模块中，取消nfsd_shrinker_work时未使用同步模式，可能导致资源释放不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2024-50121
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|---|
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Patches & Fixes for CVE-2024-50121 (6)
Same Patch Batch · Linux · 2024-11-05 · 50 CVEs total
| CVE-2024-50106 | 9.8 CRITICAL | nfsd: fix race between laundromat and free_stateid |
| CVE-2024-50113 | 8.8 HIGH | firewire: core: fix invalid port index for parent device |
| CVE-2024-50115 | 8.4 HIGH | KVM: nSVM: Ignore nCR3[4:0] when loading PDPTEs from memory |
| CVE-2024-50125 | 8.0 HIGH | Bluetooth: SCO: Fix UAF on sco_sock_timeout |
| CVE-2024-50124 | 8.0 HIGH | Bluetooth: ISO: Fix UAF on iso_sock_timeout |
| CVE-2024-50132 | 7.8 HIGH | tracing/probes: Fix MAX_TRACE_ARGS limit handling |
| CVE-2023-52920 | 7.8 HIGH | bpf: support non-r10 register spill/fill to/from stack in precision tracking |
| CVE-2024-50091 | 7.8 HIGH | dm vdo: don't refer to dedupe_context after releasing it |
| CVE-2024-50101 | 7.8 HIGH | iommu/vt-d: Fix incorrect pci_for_each_dma_alias() for non-PCI devices |
| CVE-2024-50114 | 7.8 HIGH | KVM: arm64: Unregister redistributor for failed vCPU creation |
| CVE-2024-50127 | 7.8 HIGH | net: sched: fix use-after-free in taprio_change() |
| CVE-2024-50126 | 7.8 HIGH | net: sched: use RCU read-side critical section in taprio_dump() |
| CVE-2024-50128 | 7.8 HIGH | net: wwan: fix global oob in wwan_rtnl_policy |
| CVE-2024-50130 | 7.8 HIGH | netfilter: bpf: must hold reference on net namespace |
| CVE-2024-50090 | 7.8 HIGH | drm/xe/oa: Fix overflow in oa batch buffer |
| CVE-2024-50094 | 7.5 HIGH | sfc: Don't invoke xdp_do_flush() from netpoll. |
| CVE-2024-50095 | 7.5 HIGH | RDMA/mad: Improve handling of timed out WRs of mad agent |
| CVE-2024-50131 | 7.3 HIGH | tracing: Consider the NULL character when validating the event length |
| CVE-2024-50099 | 7.3 HIGH | arm64: probes: Remove broken LDR (literal) uprobe support |
| CVE-2024-50096 | 7.3 HIGH | nouveau/dmem: Fix vulnerability in migrate_to_ram upon copy error |
Showing top 20 of 50 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
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dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev - CVE-2026-74575
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iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for
Same vendor: Linux
- CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev - CVE-2026-74575
thunderbolt: Prevent XDomain delayed work use-after-free on - CVE-2026-74573
iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for
V. Comments for CVE-2024-50121
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