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CVE-2025-38337— jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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jbd2中数据竞争和空指针取消引用，可能导致崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6e06ae88edae77379bef7c0cb7d3c2dd88676867< 5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5 affected
6e06ae88edae77379bef7c0cb7d3c2dd88676867< ec669e5bf409f16e464bfad75f0ba039a45de29a affected
6e06ae88edae77379bef7c0cb7d3c2dd88676867< 43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e affected
6e06ae88edae77379bef7c0cb7d3c2dd88676867< 23361b479f2700c00960d3ae9cdc8ededa762d47 affected
6e06ae88edae77379bef7c0cb7d3c2dd88676867< 2e7c64d7a92c031d016f11c8e8cb05131ab7b75a affected
6e06ae88edae77379bef7c0cb7d3c2dd88676867< f78b38af3540b4875147b7b884ee11a27b3dbf4c affected
6e06ae88edae77379bef7c0cb7d3c2dd88676867< a377996d714afb8d4d5f4906336f78510039da29 affected
6e06ae88edae77379bef7c0cb7d3c2dd88676867< af98b0157adf6504fade79b3e6cb260c4ff68e37 affected
… +10 more rows
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I. Basic Information for CVE-2025-38337

Vulnerability Information
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Vulnerability Title
jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata() Since handle->h_transaction may be a NULL pointer, so we should change it to call is_handle_aborted(handle) first before dereferencing it. And the following data-race was reported in my fuzzer: ================================================================== BUG: KCSAN: data-race in jbd2_journal_dirty_metadata / jbd2_journal_dirty_metadata write to 0xffff888011024104 of 4 bytes by task 10881 on cpu 1: jbd2_journal_dirty_metadata+0x2a5/0x770 fs/jbd2/transaction.c:1556 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... read to 0xffff888011024104 of 4 bytes by task 10880 on cpu 0: jbd2_journal_dirty_metadata+0xf2/0x770 fs/jbd2/transaction.c:1512 __ext4_handle_dirty_metadata+0xe7/0x4b0 fs/ext4/ext4_jbd2.c:358 ext4_do_update_inode fs/ext4/inode.c:5220 [inline] ext4_mark_iloc_dirty+0x32c/0xd50 fs/ext4/inode.c:5869 __ext4_mark_inode_dirty+0xe1/0x450 fs/ext4/inode.c:6074 ext4_dirty_inode+0x98/0xc0 fs/ext4/inode.c:6103 .... value changed: 0x00000000 -> 0x00000001 ================================================================== This issue is caused by missing data-race annotation for jh->b_modified. Therefore, the missing annotation needs to be added.
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jbd2中数据竞争和空指针取消引用，可能导致崩溃。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6e06ae88edae77379bef7c0cb7d3c2dd88676867 ~ 5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5 -
Linux Linux 4.3 -

II. Public POCs for CVE-2025-38337

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III. Intelligence Information for CVE-2025-38337

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

CVE-2025-38325 9.8 CRITICAL ksmbd: add free_transport ops in ksmbd connection
CVE-2025-38283 8.8 HIGH hisi_acc_vfio_pci: bugfix live migration function without VF device driver
CVE-2025-38290 8.8 HIGH wifi: ath12k: fix node corruption in ar->arvifs list
CVE-2025-38291 8.8 HIGH wifi: ath12k: Prevent sending WMI commands to firmware during firmware crash
CVE-2025-38293 8.8 HIGH wifi: ath11k: fix node corruption in ar->arvifs list
CVE-2025-38292 8.8 HIGH wifi: ath12k: fix invalid access to memory
CVE-2025-38343 8.3 HIGH wifi: mt76: mt7996: drop fragments with multicast or broadcast RA
CVE-2025-38321 7.8 HIGH smb: Log an error when close_all_cached_dirs fails
CVE-2025-38303 7.8 HIGH Bluetooth: eir: Fix possible crashes on eir_create_adv_data
CVE-2025-38333 7.8 HIGH f2fs: fix to bail out in get_new_segment()
CVE-2025-38317 7.8 HIGH wifi: ath12k: Fix buffer overflow in debugfs
CVE-2025-38306 7.8 HIGH fs/fhandle.c: fix a race in call of has_locked_children()
CVE-2025-38278 7.8 HIGH octeontx2-pf: QOS: Refactor TC_HTB_LEAF_DEL_LAST callback
CVE-2025-38339 7.8 HIGH powerpc/bpf: fix JIT code size calculation of bpf trampoline
CVE-2025-38270 7.8 HIGH net: drv: netdevsim: don't napi_complete() from netpoll
CVE-2025-38346 7.8 HIGH ftrace: Fix UAF when lookup kallsym after ftrace disabled
CVE-2025-38273 7.8 HIGH net: tipc: fix refcount warning in tipc_aead_encrypt
CVE-2025-38341 7.8 HIGH eth: fbnic: avoid double free when failing to DMA-map FW msg
CVE-2025-38276 7.8 HIGH fs/dax: Fix "don't skip locked entries when scanning entries"
CVE-2025-38287 7.5 HIGH IB/cm: Drop lockdep assert and WARN when freeing old msg

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-2025-38337

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