Medium 5.5Published Oct 21, 2024

CVE-2024-49881ext4: update orig_path in ext4_find_extent()

Updated under an hour ago (Oct 28, 2026, 9:50 PM ET)

Does this affect you?

It affects Linux and 7 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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: <TASK> 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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 10809df84a4d868db61af621bae3658494165279 before ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff; from 10809df84a4d868db61af621bae3658494165279 before 6766937d0327000ac1b87c97bbecdd28b0dd6599; from 10809df84a4d868db61af621bae3658494165279 before a9fcb1717d75061d3653ed69365c8d45331815cd; 10809df84a4d868db61af621bae3658494165279 builds before 6801ed1298204d16a38571091e31178bfdc3c679; from 10809df84a4d868db61af621bae3658494165279 before f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2; from 10809df84a4d868db61af621bae3658494165279 before b63481b3a388ee2df9e295f97273226140422a42; 10809df84a4d868db61af621bae3658494165279 builds before 11b230100d6801c014fab2afabc8bdea304c1b96; 10809df84a4d868db61af621bae3658494165279 builds before 5b4b2dcace35f618fe361a87bae6f0d13af31bc1	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name)	before V3.2	CISA ADP
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name)	before V3.2	CISA ADP
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name)	before V3.2	CISA ADP
linux linux_kernel linux:linux_kernel	from 3.18 before 5.10.227; from 5.11 before 5.15.168; from 5.16 before 6.1.113; from 6.2 before 6.6.55; from 6.7 before 6.10.14; from 6.11 before 6.11.3	NVD

References

References

https://git.kernel.org/stable/c/ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff
https://git.kernel.org/stable/c/6766937d0327000ac1b87c97bbecdd28b0dd6599	patch
https://git.kernel.org/stable/c/a9fcb1717d75061d3653ed69365c8d45331815cd	patch
https://git.kernel.org/stable/c/6801ed1298204d16a38571091e31178bfdc3c679	patch
https://git.kernel.org/stable/c/f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2	patch
https://git.kernel.org/stable/c/b63481b3a388ee2df9e295f97273226140422a42	patch
https://git.kernel.org/stable/c/11b230100d6801c014fab2afabc8bdea304c1b96	patch
https://git.kernel.org/stable/c/5b4b2dcace35f618fe361a87bae6f0d13af31bc1	patch
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
1–10 of 12

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.