CVE-2024-49881

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Source
https://cve.org/CVERecord?id=CVE-2024-49881
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49881.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-49881
Downstream
Related
Published
2024-10-21T18:01:19Z
Modified
2026-08-12T03:30:32Z
Summary
ext4: update orig_path in ext4_find_extent()
Details

In the Linux kernel, the following vulnerability has been resolved:

ext4: update orig_path in ext4_find_extent()

In ext4_find_extent(), if the path is not big enough, we free it and set *orig_path to NULL. But after reallocating and successfully initializing the path, we don't update *orig_path, in which case the caller gets a valid path but a NULL ppath, and this may cause a NULL pointer dereference or a path memory leak. For example:

ext4_split_extent path = *ppath = 2000 ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path = 2000); *orig_path = path = NULL; path = kcalloc() = 3000 ext4_split_extent_at(*ppath = NULL) path = *ppath; ex = path[depth].p_ext; // NULL pointer dereference!

================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000010 CPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847 RIP: 0010:ext4_split_extent_at+0x6d/0x560 Call Trace: ext4_split_extent.isra.0+0xcb/0x1b0 ext4_ext_convert_to_initialized+0x168/0x6c0 ext4_ext_handle_unwritten_extents+0x325/0x4d0 ext4_ext_map_blocks+0x520/0xdb0 ext4_map_blocks+0x2b0/0x690 ext4_iomap_begin+0x20e/0x2c0 [...]

Therefore, *orig_path is updated when the extent lookup succeeds, so that the caller can safely use path or *ppath.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49881.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
10809df84a4d868db61af621bae3658494165279
Fixed
ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff
Fixed
6766937d0327000ac1b87c97bbecdd28b0dd6599
Fixed
a9fcb1717d75061d3653ed69365c8d45331815cd
Fixed
6801ed1298204d16a38571091e31178bfdc3c679
Fixed
f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2
Fixed
b63481b3a388ee2df9e295f97273226140422a42
Fixed
11b230100d6801c014fab2afabc8bdea304c1b96
Fixed
5b4b2dcace35f618fe361a87bae6f0d13af31bc1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49881.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.18.0
Fixed
4.19.323
Type
ECOSYSTEM
Events
Introduced
4.20.0
Fixed
5.10.227
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.168
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.113
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.55
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.10.14
Type
ECOSYSTEM
Events
Introduced
6.11.0
Fixed
6.11.3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49881.json"