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CVE-2025-38338— fs/nfs/read: fix double-unlock bug in nfs_return_empty_folio()

AI Predicted 4.9 Difficulty: Theoretical EPSS 0.07% · P21

Affected Version Matrix 10

VendorProductVersion RangeStatus
LinuxLinux000dbe0bec058cbf2ca9e156e4a5584f5158b0f9< 14f5549ad163be2c018abc1bb38370fff617a243affected
000dbe0bec058cbf2ca9e156e4a5584f5158b0f9< 5bf0b9eeb0174686f22c2e5b8fb9f47ad25da6f5affected
000dbe0bec058cbf2ca9e156e4a5584f5158b0f9< 1e93b61d3eaa14bfebcc2716ac09d43f3845d420affected
000dbe0bec058cbf2ca9e156e4a5584f5158b0f9< 4c10fa44bc5f700e2ea21de2fbae520ba21f19d9affected
6.4affected
< 6.4unaffected
6.6.95≤ 6.6.*unaffected
6.12.35≤ 6.12.*unaffected
… +2 more rows
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I. Basic Information for CVE-2025-38338

Vulnerability Information
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Vulnerability Title
fs/nfs/read: fix double-unlock bug in nfs_return_empty_folio()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fs/nfs/read: fix double-unlock bug in nfs_return_empty_folio() Sometimes, when a file was read while it was being truncated by another NFS client, the kernel could deadlock because folio_unlock() was called twice, and the second call would XOR back the `PG_locked` flag. Most of the time (depending on the timing of the truncation), nobody notices the problem because folio_unlock() gets called three times, which flips `PG_locked` back off: 1. vfs_read, nfs_read_folio, ... nfs_read_add_folio, nfs_return_empty_folio 2. vfs_read, nfs_read_folio, ... netfs_read_collection, netfs_unlock_abandoned_read_pages 3. vfs_read, ... nfs_do_read_folio, nfs_read_add_folio, nfs_return_empty_folio The problem is that nfs_read_add_folio() is not supposed to unlock the folio if fscache is enabled, and a nfs_netfs_folio_unlock() check is missing in nfs_return_empty_folio(). Rarely this leads to a warning in netfs_read_collection(): ------------[ cut here ]------------ R=0000031c: folio 10 is not locked WARNING: CPU: 0 PID: 29 at fs/netfs/read_collect.c:133 netfs_read_collection+0x7c0/0xf00 [...] Workqueue: events_unbound netfs_read_collection_worker RIP: 0010:netfs_read_collection+0x7c0/0xf00 [...] Call Trace: <TASK> netfs_read_collection_worker+0x67/0x80 process_one_work+0x12e/0x2c0 worker_thread+0x295/0x3a0 Most of the time, however, processes just get stuck forever in folio_wait_bit_common(), waiting for `PG_locked` to disappear, which never happens because nobody is really holding the folio lock.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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nfs/read中双重解锁问题，可能导致死锁。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 000dbe0bec058cbf2ca9e156e4a5584f5158b0f9 ~ 14f5549ad163be2c018abc1bb38370fff617a243 -
LinuxLinux 6.4 -

II. Public POCs for CVE-2025-38338

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III. Intelligence Information for CVE-2025-38338

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Same Patch Batch · Linux · 2025-07-10 · 84 CVEs total

CVE-2025-38318perf: arm-ni: Fix missing platform_set_drvdata()
CVE-2025-38327fgraph: Do not enable function_graph tracer when setting funcgraph-args
CVE-2025-38314virtio-pci: Fix result size returned for the admin command completion
CVE-2025-38316wifi: mt76: mt7996: avoid NULL pointer dereference in mt7996_set_monitor()
CVE-2025-38312fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()
CVE-2025-38310seg6: Fix validation of nexthop addresses
CVE-2025-38309drm/xe/vm: move xe_svm_init() earlier
CVE-2025-38308ASoC: Intel: avs: Fix possible null-ptr-deref when initing hw
CVE-2025-38306fs/fhandle.c: fix a race in call of has_locked_children()
CVE-2025-38311iavf: get rid of the crit lock
CVE-2025-38315Bluetooth: btintel: Check dsbr size from EFI variable
CVE-2025-38317wifi: ath12k: Fix buffer overflow in debugfs
CVE-2025-38319drm/amd/pp: Fix potential NULL pointer dereference in atomctrl_initialize_mc_reg_table
CVE-2025-38320arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()
CVE-2025-38321smb: Log an error when close_all_cached_dirs fails
CVE-2025-38322perf/x86/intel: Fix crash in icl_update_topdown_event()
CVE-2025-38323net: atm: add lec_mutex
CVE-2025-38324mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu().
CVE-2025-38325ksmbd: add free_transport ops in ksmbd connection
CVE-2025-38326aoe: clean device rq_list in aoedev_downdev()

Showing top 20 of 84 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38338

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