Answer in brief
CVE-2024-44939 records a High severity (CVSS 7.8) vulnerability in jfs: fix null ptr deref in dtInsertEntry. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f98bf80b20f4a930589cda48a35f751a64fe0dc2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <53023ab11836ac56fd75f7a71ec1356e50920fa9 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ea10dbb1e6c58384136e9adfd75f81951e423f6 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9c2ac38530d1a3ee558834dfa16c85a40fd0e702 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ce6dede912f064a855acf6f04a04cbb2c25b8c8c | f98bf80b20f4a930589cda48a35f751a64fe0dc2, 53023ab11836ac56fd75f7a71ec1356e50920fa9, 6ea10dbb1e6c58384136e9adfd75f81951e423f6, 9c2ac38530d1a3ee558834dfa16c85a40fd0e702, ce6dede912f064a855acf6f04a04cbb2c25b8c8c |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 26, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.