CVE-2023-53468: In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix memory leak in alloc_wbufs() kmemleak reported a sequence of memory leaks, and…

PriorityP417medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.15%

4.3th percentile

In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix memory leak in alloc_wbufs() kmemleak reported a sequence of memory leaks, and show them as following: unreferenced object 0xffff8881575f8400 (size 1024): comm "mount", pid 19625, jiffies 4297119604 (age 20.383s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] __kmalloc+0x4d/0x150 [] ubifs_mount+0x307b/0x7170 [ubifs] [] legacy_get_tree+0xed/0x1d0 [] vfs_get_tree+0x7d/0x230 [] path_mount+0xdd4/0x17b0 [] __x64_sys_mount+0x1fa/0x270 [] do_syscall_64+0x35/0x80 [] entry_SYSCALL_64_after_hwframe+0x46/0xb0 unreferenced object 0xffff8881798a6e00 (size 512): comm "mount", pid 19677, jiffies 4297121912 (age 37.816s) hex dump (first 32 bytes): 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk backtrace: [] __kmalloc+0x4d/0x150 [] ubifs_wbuf_init+0x52/0x480 [ubifs] [] ubifs_mount+0x31f5/0x7170 [ubifs] [] legacy_get_tree+0xed/0x1d0 [] vfs_get_tree+0x7d/0x230 [] path_mount+0xdd4/0x17b0 [] __x64_sys_mount+0x1fa/0x270 [] do_syscall_64+0x35/0x80 [] entry_SYSCALL_64_after_hwframe+0x46/0xb0 The problem is that the ubifs_wbuf_init() returns an error in the loop which in the alloc_wbufs(), then the wbuf->buf and wbuf->inodes that were successfully alloced before are not freed. Fix it by adding error hanging path in alloc_wbufs() which frees the memory alloced before when ubifs_wbuf_init() returns an error.

Affected

17 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.20-1 (bookworm)	linux 6.1.20-1 (bookworm)
linux	linux	—	—
linux	linux	>= 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d < 1f206002c6bc302bface871ef3f72c0bbcaa931c	1f206002c6bc302bface871ef3f72c0bbcaa931c
linux	linux	>= 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d < bf50229494f0443b3f08427d7df63e5a7e2a796a	bf50229494f0443b3f08427d7df63e5a7e2a796a
linux	linux	>= 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d < 3e29634eb56e6547272fe4e568f63421f8b3b9fa	3e29634eb56e6547272fe4e568f63421f8b3b9fa
linux	linux	>= 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d < 26ec45f1c504e15268383019df139d7983f1e67f	26ec45f1c504e15268383019df139d7983f1e67f
linux	linux	>= 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d < e11f36d3bc4d23f620754a948fe7b82b63dcb185	e11f36d3bc4d23f620754a948fe7b82b63dcb185
linux	linux	>= 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d < 4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2	4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.20-1	6.1.20-1
linux	linux_kernel	>= 0 < 6.1.20-1	6.1.20-1
linux	linux_kernel	>= 0 < 6.1.20-1	6.1.20-1
linux	linux_kernel	>= 2.6.27 < 5.4.235	5.4.235
linux	linux_kernel	>= 5.11 < 5.15.100	5.15.100
linux	linux_kernel	>= 5.16 < 6.1.18	6.1.18
linux	linux_kernel	>= 5.5 < 5.10.173	5.10.173
linux	linux_kernel	>= 6.2 < 6.2.5	6.2.5

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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