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CVE-2024-36938— bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 bpf,skmsg 模块 sk_psock_skb_ingress_enqueue 中的空指针取消引用。

AI Predicted 6.5 Difficulty: Hard EPSS 0.24% · P15

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 604326b41a6fb9b4a78b6179335decee0365cd8c< c0809c128dad4c3413818384eb06a341633db973 affected
604326b41a6fb9b4a78b6179335decee0365cd8c< 5965bc7535fb87510b724e5465ccc1a1cf00916d affected
604326b41a6fb9b4a78b6179335decee0365cd8c< 39dc9e1442385d6e9be0b6491ee488dddd55ae27 affected
604326b41a6fb9b4a78b6179335decee0365cd8c< b397a0ab8582c533ec0c6b732392f141fc364f87 affected
604326b41a6fb9b4a78b6179335decee0365cd8c< 772d5729b5ff0df0d37b32db600ce635b2172f80 affected
604326b41a6fb9b4a78b6179335decee0365cd8c< 6648e613226e18897231ab5e42ffc29e63fa3365 affected
4.20 affected
< 4.20 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-36938

Vulnerability Information
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Vulnerability Title
bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue Fix NULL pointer data-races in sk_psock_skb_ingress_enqueue() which syzbot reported [1]. [1] BUG: KCSAN: data-race in sk_psock_drop / sk_psock_skb_ingress_enqueue write to 0xffff88814b3278b8 of 8 bytes by task 10724 on cpu 1: sk_psock_stop_verdict net/core/skmsg.c:1257 [inline] sk_psock_drop+0x13e/0x1f0 net/core/skmsg.c:843 sk_psock_put include/linux/skmsg.h:459 [inline] sock_map_close+0x1a7/0x260 net/core/sock_map.c:1648 unix_release+0x4b/0x80 net/unix/af_unix.c:1048 __sock_release net/socket.c:659 [inline] sock_close+0x68/0x150 net/socket.c:1421 __fput+0x2c1/0x660 fs/file_table.c:422 __fput_sync+0x44/0x60 fs/file_table.c:507 __do_sys_close fs/open.c:1556 [inline] __se_sys_close+0x101/0x1b0 fs/open.c:1541 __x64_sys_close+0x1f/0x30 fs/open.c:1541 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 read to 0xffff88814b3278b8 of 8 bytes by task 10713 on cpu 0: sk_psock_data_ready include/linux/skmsg.h:464 [inline] sk_psock_skb_ingress_enqueue+0x32d/0x390 net/core/skmsg.c:555 sk_psock_skb_ingress_self+0x185/0x1e0 net/core/skmsg.c:606 sk_psock_verdict_apply net/core/skmsg.c:1008 [inline] sk_psock_verdict_recv+0x3e4/0x4a0 net/core/skmsg.c:1202 unix_read_skb net/unix/af_unix.c:2546 [inline] unix_stream_read_skb+0x9e/0xf0 net/unix/af_unix.c:2682 sk_psock_verdict_data_ready+0x77/0x220 net/core/skmsg.c:1223 unix_stream_sendmsg+0x527/0x860 net/unix/af_unix.c:2339 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:745 ____sys_sendmsg+0x312/0x410 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x1e9/0x280 net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 value changed: 0xffffffff83d7feb0 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10713 Comm: syz-executor.4 Tainted: G W 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Prior to this, commit 4cd12c6065df ("bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready()") fixed one NULL pointer similarly due to no protection of saved_data_ready. Here is another different caller causing the same issue because of the same reason. So we should protect it with sk_callback_lock read lock because the writer side in the sk_psock_drop() uses "write_lock_bh(&sk->sk_callback_lock);". To avoid errors that could happen in future, I move those two pairs of lock into the sk_psock_data_ready(), which is suggested by John Fastabend.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 bpf,skmsg 模块 sk_psock_skb_ingress_enqueue 中的空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 604326b41a6fb9b4a78b6179335decee0365cd8c ~ c0809c128dad4c3413818384eb06a341633db973 -
Linux Linux 4.20 -

II. Public POCs for CVE-2024-36938

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III. Intelligence Information for CVE-2024-36938

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Other References for CVE-2024-36938 (6)

Same Patch Batch · Linux · 2024-05-30 · 93 CVEs total

CVE-2024-36958 9.8 CRITICAL NFSD: Fix nfsd4_encode_fattr4() crasher
CVE-2024-36886 9.8 CRITICAL tipc: fix UAF in error path
CVE-2024-36911 9.8 CRITICAL hv_netvsc: Don't free decrypted memory
CVE-2024-36912 9.6 CRITICAL Drivers: hv: vmbus: Track decrypted status in vmbus_gpadl
CVE-2024-36913 9.3 CRITICAL Drivers: hv: vmbus: Leak pages if set_memory_encrypted() fails
CVE-2024-36909 9.3 CRITICAL Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted
CVE-2024-36922 8.8 HIGH wifi: iwlwifi: read txq->read_ptr under lock
CVE-2024-36921 8.8 HIGH wifi: iwlwifi: mvm: guard against invalid STA ID on removal
CVE-2024-36910 8.4 HIGH uio_hv_generic: Don't free decrypted memory
CVE-2024-36032 8.1 HIGH Bluetooth: qca: fix info leak when fetching fw build id
CVE-2024-36933 7.8 HIGH nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment().
CVE-2024-36904 7.8 HIGH tcp: Use refcount_inc_not_zero() in tcp_twsk_unique().
CVE-2024-36914 7.8 HIGH drm/amd/display: Skip on writeback when it's not applicable
CVE-2024-36918 7.8 HIGH bpf: Check bloom filter map value size
CVE-2024-36018 7.8 HIGH nouveau/uvmm: fix addr/range calcs for remap operations
CVE-2024-36894 7.8 HIGH usb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete
CVE-2024-36890 7.8 HIGH mm/slab: make __free(kfree) accept error pointers
CVE-2024-36940 7.8 HIGH pinctrl: core: delete incorrect free in pinctrl_enable()
CVE-2024-36928 7.8 HIGH s390/qeth: Fix kernel panic after setting hsuid
CVE-2024-36884 7.8 HIGH iommu/arm-smmu: Use the correct type in nvidia_smmu_context_fault()

Showing top 20 of 93 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36938

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