In the Linux kernel, the following vulnerability has been resolved:
netfs: Only create /proc/fs/netfs with CONFIG_PROC_FS
When testing a special config:
CONFIG_NETFS_SUPPORTS=y CONFIG_PROC_FS=n
The system crashes with something like:
[ 3.766197] ------------[ cut here ]------------ [ 3.766484] kernel BUG at mm/mempool.c:560! [ 3.766789] Oops: invalid opcode: 0000 [#1] SMP NOPTI [ 3.767123] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G W [ 3.767777] Tainted: [W]=WARN [ 3.767968] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), [ 3.768523] RIP: 0010:mempool_alloc_slab.cold+0x17/0x19 [ 3.768847] Code: 50 fe ff 58 5b 5d 41 5c 41 5d 41 5e 41 5f e9 93 95 13 00 [ 3.769977] RSP: 0018:ffffc90000013998 EFLAGS: 00010286 [ 3.770315] RAX: 000000000000002f RBX: ffff888100ba8640 RCX: 0000000000000000 [ 3.770749] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff [ 3.771217] RBP: 0000000000092880 R08: 0000000000000000 R09: ffffc90000013828 [ 3.771664] R10: 0000000000000001 R11: 00000000ffffffea R12: 0000000000092cc0 [ 3.772117] R13: 0000000000000400 R14: ffff8881004b1620 R15: ffffea0004ef7e40 [ 3.772554] FS: 0000000000000000(0000) GS:ffff8881b5f3c000(0000) knlGS:0000000000000000 [ 3.773061] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.773443] CR2: ffffffff830901b4 CR3: 0000000004296001 CR4: 0000000000770ef0 [ 3.773884] PKRU: 55555554 [ 3.774058] Call Trace: [ 3.774232] <TASK> [ 3.774371] mempool_alloc_noprof+0x6a/0x190 [ 3.774649] ? _printk+0x57/0x80 [ 3.774862] netfs_alloc_request+0x85/0x2ce [ 3.775147] netfs_readahead+0x28/0x170 [ 3.775395] read_pages+0x6c/0x350 [ 3.775623] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.775928] page_cache_ra_unbounded+0x1bd/0x2a0 [ 3.776247] filemap_get_pages+0x139/0x970 [ 3.776510] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.776820] filemap_read+0xf9/0x580 [ 3.777054] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.777368] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.777674] ? find_held_lock+0x32/0x90 [ 3.777929] ? netfs_start_io_read+0x19/0x70 [ 3.778221] ? netfs_start_io_read+0x19/0x70 [ 3.778489] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.778800] ? lock_acquired+0x1e6/0x450 [ 3.779054] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.779379] netfs_buffered_read_iter+0x57/0x80 [ 3.779670] __kernel_read+0x158/0x2c0 [ 3.779927] bprm_execve+0x300/0x7a0 [ 3.780185] kernel_execve+0x10c/0x140 [ 3.780423] ? __pfx_kernel_init+0x10/0x10 [ 3.780690] kernel_init+0xd5/0x150 [ 3.780910] ret_from_fork+0x2d/0x50 [ 3.781156] ? __pfx_kernel_init+0x10/0x10 [ 3.781414] ret_from_fork_asm+0x1a/0x30 [ 3.781677] </TASK> [ 3.781823] Modules linked in: [ 3.782065] ---[ end trace 0000000000000000 ]---
This is caused by the following error path in netfs_init():
if (!proc_mkdir("fs/netfs", NULL)) goto error_proc;
Fix this by adding ifdef in netfs_main(), so that /proc/fs/netfs is only created with CONFIG_PROC_FS.
CVSS Details
- CVSS 3.1 Base Score: 7
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perf6.12-debuginfoUpgrade kernel-modules-extra-commonUpgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-libbpf-develUpgrade kernel-tools-develUpgrade kernel6.12-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade kernel-livepatch-6.12.29-33.102Upgrade kernel6.12Upgrade perf6.12Upgrade kernel-libbpf-staticUpgrade kernel-libbpfUpgrade kernel-develUpgrade kernel-libbpf-debuginfoUpgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade python3-perf6.12Upgrade bpftool | Aug 5, 2025 | May 9, 2025 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 9, 2025 |
| Ubuntu | — | Upgrade linux-image-oracle-64kUpgrade linux-image-6.14.0-1007-oracle-64kUpgrade linux-image-oracleUpgrade linux-image-6.14.0-22-genericUpgrade linux-image-6.14.0-1007-oracleUpgrade linux-image-realtimeUpgrade linux-image-6.14.0-1007-azure-fdeUpgrade linux-image-6.14.0-1004-realtimeUpgrade linux-image-6.14.0-22-generic-64kUpgrade linux-image-aws-64kUpgrade linux-image-genericUpgrade linux-image-awsUpgrade linux-image-gcpUpgrade linux-image-6.14.0-1007-aws-64kUpgrade linux-image-6.14.0-1008-gcp-64kUpgrade linux-image-raspiUpgrade linux-image-6.14.0-1007-awsUpgrade linux-image-azure-fdeUpgrade linux-image-6.14.0-1008-gcpUpgrade linux-image-azureUpgrade linux-image-gcp-64kUpgrade linux-image-6.14.0-1007-raspiUpgrade linux-image-generic-64kUpgrade linux-image-6.14.0-1007-azure | Jun 26, 2025 | May 9, 2025 |
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