CVE-2024-44939 (GCVE-0-2024-44939)

Vulnerability from cvelistv5 – Published: 2024-08-26 11:20 – Updated: 2026-01-05 10:52
VLAI?
Title
jfs: fix null ptr deref in dtInsertEntry
Summary
In the Linux kernel, the following vulnerability has been resolved: jfs: fix null ptr deref in dtInsertEntry [syzbot reported] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 5061 Comm: syz-executor404 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713 ... [Analyze] In dtInsertEntry(), when the pointer h has the same value as p, after writing name in UniStrncpy_to_le(), p->header.flag will be cleared. This will cause the previously true judgment "p->header.flag & BT-LEAF" to change to no after writing the name operation, this leads to entering an incorrect branch and accessing the uninitialized object ih when judging this condition for the second time. [Fix] After got the page, check freelist first, if freelist == 0 then exit dtInsert() and return -EINVAL.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f98bf80b20f4a930589cda48a35f751a64fe0dc2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 53023ab11836ac56fd75f7a71ec1356e50920fa9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6ea10dbb1e6c58384136e9adfd75f81951e423f6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9c2ac38530d1a3ee558834dfa16c85a40fd0e702 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ce6dede912f064a855acf6f04a04cbb2c25b8c8c (git)
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    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.107 , ≤ 6.1.* (semver)
Unaffected: 6.6.47 , ≤ 6.6.* (semver)
Unaffected: 6.10.6 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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