Linux Kernel 6.1.0-rc3- net net/core/dev.c napi_schedule_prep state issue

Summaryinfo

A vulnerability classified as problematic has been found in Linux Kernel 6.1.0-rc3-. Impacted is the function napi_schedule_prep of the file net/core/dev.c of the component net. This manipulation causes state issue. The identification of this vulnerability is CVE-2022-49856. There is no exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel 6.1.0-rc3- and classified as problematic. Affected by this vulnerability is the function napi_schedule_prep of the file net/core/dev.c of the component net. The manipulation with an unknown input leads to a state issue vulnerability. The CWE definition for the vulnerability is CWE-371. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: tun: call napi_schedule_prep() to ensure we own a napi A recent patch exposed another issue in napi_get_frags() caught by syzbot [1] Before feeding packets to GRO, and calling napi_complete() we must first grab NAPI_STATE_SCHED. [1] WARNING: CPU: 0 PID: 3612 at net/core/dev.c:6076 napi_complete_done+0x45b/0x880 net/core/dev.c:6076 Modules linked in: CPU: 0 PID: 3612 Comm: syz-executor408 Not tainted 6.1.0-rc3-syzkaller-00175-g1118b2049d77 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:napi_complete_done+0x45b/0x880 net/core/dev.c:6076 Code: c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 24 04 00 00 41 89 5d 1c e9 73 fc ff ff e8 b5 53 22 fa 0b e9 82 fe ff ff e8 a9 53 22 fa 48 8b 5c 24 08 31 ff 48 89 de RSP: 0018:ffffc90003c4f920 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000030 RCX: 0000000000000000 RDX: ffff8880251c0000 RSI: ffffffff875a58db RDI: 0000000000000007 RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888072d02628 R13: ffff888072d02618 R14: ffff888072d02634 R15: 0000000000000000 FS: 0000555555f13300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055c44d3892b8 CR3: 00000000172d2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: napi_complete include/linux/netdevice.h:510 [inline] tun_get_user+0x206d/0x3a60 drivers/net/tun.c:1980 tun_chr_write_iter+0xdb/0x200 drivers/net/tun.c:2027 call_write_iter include/linux/fs.h:2191 [inline] do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735 do_iter_write+0x182/0x700 fs/read_write.c:861 vfs_writev+0x1aa/0x630 fs/read_write.c:934 do_writev+0x133/0x2f0 fs/read_write.c:977 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f37021a3c19

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2022-49856 since 05/01/2025. The exploitation appears to be difficult. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/01/2025).

Applying the patch 310f0855352ee4b2eb38855c99185c23e6e1496b/30b0263d0366ea63aa7cad0407dfd945cc348580/534762e261c84d43e5d56a780e40278b94c20540/9132fa043f96ac545254ab326db5c6fd47d54acb/999550c8cbb3fcb535f542d652fe1cb936839e5f/07d120aa33cc9d9115753d159f64d20c94458781 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.1.0-rc3-

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Entryinfo

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