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jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata() (Linux Linux)

CVE-2025-38337
MEDIUM 5.5

At a glance

Source
NVD
EPSS
EPSS 0.20 % · percentile 9 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Analyzed

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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.

Weaknesses (CWE)

  • CWE-476 — NULL Pointer Dereference

References

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 5c1a34ff5b0bfdfd2f9343aa9b08d25df618bac5 ; affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < ec669e5bf409f16e464bfad75f0ba039a45de29a ; affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 43d5e3bb5f1dcd91e30238ea0b59a5f77063f84e ; affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 23361b479f2700c00960d3ae9cdc8ededa762d47 ; affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < 2e7c64d7a92c031d016f11c8e8cb05131ab7b75a ; affected 6e06ae88edae77379bef7c0cb7d3c2dd88676867 < f78b38af3540b4875147b7b884ee11a27b3dbf4c
Linux · Linuxaffected 4.3 ; unaffected 0 < 4.3 ; unaffected 5.4.295 ≤ 5.4.* ; unaffected 5.10.239 ≤ 5.10.* ; unaffected 5.15.186 ≤ 5.15.* ; unaffected 6.1.142 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD