CVE-2022-49837

published 2025-05-01

CVE-2022-49837: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix memory leaks in __check_func_call kmemleak reports this issue: unreferenced object…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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

bpf: Fix memory leaks in __check_func_call

kmemleak reports this issue:

unreferenced object 0xffff88817139d000 (size 2048):
comm "test_progs", pid 33246, jiffies 4307381979 (age 45851.820s)
hex dump (first 32 bytes):
01 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_trace+0x27/0xa0
[] __check_func_call+0x316/0x1230
[] check_helper_call+0x172e/0x4700
[] do_check+0x21d8/0x45e0
[] do_check_common+0x767/0xaf0
[] bpf_check+0x43e3/0x5bc0
[] bpf_prog_load+0xf26/0x1940
[] __sys_bpf+0xd2c/0x3650
[] __x64_sys_bpf+0x75/0xc0
[] do_syscall_64+0x3b/0x90
[] entry_SYSCALL_64_after_hwframe+0x63/0xcd

The root case here is: In function prepare_func_exit(), the callee is
not released in the abnormal scenario after "state->curframe--;". To
fix, move "state->curframe--;" to the very bottom of the function,
right when we free callee and reset frame[] pointer to NULL, as Andrii
suggested.

In addition, function __check_func_call() has a similar problem. In
the abnormal scenario before "state->curframe++;", the callee also
should be released by free_func_state().

Affected

11 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.0.10-1 (bookworm)	linux 6.0.10-1 (bookworm)
linux	linux	—	—
linux	linux	>= fd978bf7fd312581a7ca454a991f0ffb34c4204b < d4944497827a3d14bc5a26dbcfb7433eb5a956c0	d4944497827a3d14bc5a26dbcfb7433eb5a956c0
linux	linux	>= fd978bf7fd312581a7ca454a991f0ffb34c4204b < 83946d772e756734a900ef99dbe0aeda506adf37	83946d772e756734a900ef99dbe0aeda506adf37
linux	linux	>= fd978bf7fd312581a7ca454a991f0ffb34c4204b < eb86559a691cea5fa63e57a03ec3dc9c31e97955	eb86559a691cea5fa63e57a03ec3dc9c31e97955
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.0.10-1	6.0.10-1
linux	linux_kernel	>= 0 < 6.0.10-1	6.0.10-1
linux	linux_kernel	>= 0 < 6.0.10-1	6.0.10-1
linux	linux_kernel	>= 4.20 < 5.15.80	5.15.80
linux	linux_kernel	>= 5.16 < 6.0.10	6.0.10

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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