cbcvebase.
CVE-2024-49881
published 2024-10-21

CVE-2024-49881: 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…

PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.25%
16.3th percentile
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.

Affected

32 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.115-1 (bookworm)linux 6.1.115-1 (bookworm)
debianlinux-6.1< linux 6.1.115-1 (bookworm)linux 6.1.115-1 (bookworm)
linuxlinux
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdffec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < 6766937d0327000ac1b87c97bbecdd28b0dd65996766937d0327000ac1b87c97bbecdd28b0dd6599
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < a9fcb1717d75061d3653ed69365c8d45331815cda9fcb1717d75061d3653ed69365c8d45331815cd
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < 6801ed1298204d16a38571091e31178bfdc3c6796801ed1298204d16a38571091e31178bfdc3c679
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < b63481b3a388ee2df9e295f97273226140422a42b63481b3a388ee2df9e295f97273226140422a42
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < 11b230100d6801c014fab2afabc8bdea304c1b9611b230100d6801c014fab2afabc8bdea304c1b96
linuxlinux>= 10809df84a4d868db61af621bae3658494165279 < 5b4b2dcace35f618fe361a87bae6f0d13af31bc15b4b2dcace35f618fe361a87bae6f0d13af31bc1
linuxlinux_kernel>= 0 < 5.10.234-15.10.234-1
linuxlinux_kernel>= 0 < 6.1.115-16.1.115-1
linuxlinux_kernel>= 0 < 6.11.4-16.11.4-1
linuxlinux_kernel>= 0 < 6.11.4-16.11.4-1
linuxlinux_kernel>= 0 < 5.15.0-127.1375.15.0-127.137
linuxlinux_kernel>= 0 < 6.8.0-54.566.8.0-54.56
linuxlinux_kernel>= 0 < 6.11.0-18.186.11.0-18.18
linuxlinux_kernel>= 3.18 < 5.10.2275.10.227
linuxlinux_kernel>= 5.11 < 5.15.1685.15.168
linuxlinux_kernel>= 5.16 < 6.1.1136.1.113
linuxlinux_kernel>= 6.11 < 6.11.36.11.3
linuxlinux_kernel>= 6.2 < 6.6.556.6.55
linuxlinux_kernel>= 6.7 < 6.10.146.10.14
msrcazl3_kernel_6.6.51.1-5_on_azure_linux_3.0

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian5.5MEDIUM
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
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