CVE-2024-44939
Linux Kernel JFS Null Pointer Dereference
Description
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.
INFO
Published Date :
Aug. 26, 2024, 12:15 p.m.
Last Modified :
Sept. 12, 2024, 8:58 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-44939.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2024-44939 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-44939 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Sep. 12, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://git.kernel.org/stable/c/53023ab11836ac56fd75f7a71ec1356e50920fa9 No Types Assigned https://git.kernel.org/stable/c/53023ab11836ac56fd75f7a71ec1356e50920fa9 Patch Changed Reference Type https://git.kernel.org/stable/c/6ea10dbb1e6c58384136e9adfd75f81951e423f6 No Types Assigned https://git.kernel.org/stable/c/6ea10dbb1e6c58384136e9adfd75f81951e423f6 Patch Changed Reference Type https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702 No Types Assigned https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702 Patch Changed Reference Type https://git.kernel.org/stable/c/ce6dede912f064a855acf6f04a04cbb2c25b8c8c No Types Assigned https://git.kernel.org/stable/c/ce6dede912f064a855acf6f04a04cbb2c25b8c8c Patch Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 6.6.47 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.10.6 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 29, 2024
Action Type Old Value New Value Added Reference kernel.org https://git.kernel.org/stable/c/53023ab11836ac56fd75f7a71ec1356e50920fa9 [No types assigned] -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 26, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/6ea10dbb1e6c58384136e9adfd75f81951e423f6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/9c2ac38530d1a3ee558834dfa16c85a40fd0e702 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ce6dede912f064a855acf6f04a04cbb2c25b8c8c [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-44939 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-44939
weaknesses.