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CVE-2023-53338— lwt: Fix return values of BPF xmit ops

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 xmit操作返回值处理不当，可能导致释放后的skb继续传输，造成释放后重用和内核崩溃。

CVSS 9.8 · Critical EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 67f8f2bae8e7ac72e09def2b667e44704c4d1ee1 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< a97f221651fcdc891166e9bc270e3d9bfa5a0080 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< e3f647e4b642f9f6d32795a16f92c116c138d2af affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 065d5f17096ec9161180e2c890afdff4dc6125f2 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< d68c17402442f5f494a2c3ebde5cb82f6aa9160a affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 65583f9e070db7bece20710cfa2e3daeb0b831d9 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 29b22badb7a84b783e3a4fffca16f7768fb31205 affected
4.10 affected
… +8 more rows
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I. Basic Information for CVE-2023-53338

Vulnerability Information
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Vulnerability Title
lwt: Fix return values of BPF xmit ops
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lwt: Fix return values of BPF xmit ops BPF encap ops can return different types of positive values, such like NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in ip(6)_finish_output2. When this happens, skbs that have been freed would continue to the neighbor subsystem, causing use-after-free bug and kernel crashes. To fix the incorrect behavior, skb_do_redirect return values can be simply discarded, the same as tc-egress behavior. On the other hand, bpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU information. Thus convert its return values to avoid the conflict with LWTUNNEL_XMIT_CONTINUE.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 xmit操作返回值处理不当，可能导致释放后的skb继续传输，造成释放后重用和内核崩溃。
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 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 ~ 67f8f2bae8e7ac72e09def2b667e44704c4d1ee1 -
Linux Linux 4.10 -

II. Public POCs for CVE-2023-53338

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III. Intelligence Information for CVE-2023-53338

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Same Patch Batch · Linux · 2025-09-17 · 56 CVEs total

CVE-2022-50363 9.8 CRITICAL skmsg: pass gfp argument to alloc_sk_msg()
CVE-2022-50373 9.8 CRITICAL fs: dlm: fix race in lowcomms
CVE-2023-53360 9.8 CRITICAL NFSv4.2: Rework scratch handling for READ_PLUS (again)
CVE-2023-53358 8.8 HIGH ksmbd: fix racy issue under cocurrent smb2 tree disconnect
CVE-2022-50367 7.8 HIGH fs: fix UAF/GPF bug in nilfs_mdt_destroy
CVE-2023-53354 7.8 HIGH skbuff: skb_segment, Call zero copy functions before using skbuff frags
CVE-2022-50362 7.8 HIGH dmaengine: hisilicon: Add multi-thread support for a DMA channel
CVE-2022-50368 7.8 HIGH drm/msm/dsi: fix memory corruption with too many bridges
CVE-2023-53340 7.8 HIGH net/mlx5: Collect command failures data only for known commands
CVE-2022-50354 7.8 HIGH drm/amdkfd: Fix kfd_process_device_init_vm error handling
CVE-2022-50355 7.8 HIGH staging: vt6655: fix some erroneous memory clean-up loops
CVE-2023-53335 7.5 HIGH RDMA/cxgb4: Fix potential null-ptr-deref in pass_establish()
CVE-2022-50365 7.5 HIGH skbuff: Account for tail adjustment during pull operations
CVE-2023-53336 media: ipu-bridge: Fix null pointer deref on SSDB/PLD parsing warnings
CVE-2022-50372 cifs: Fix memory leak when build ntlmssp negotiate blob failed
CVE-2022-50371 led: qcom-lpg: Fix sleeping in atomic
CVE-2022-50370 i2c: designware: Fix handling of real but unexpected device interrupts
CVE-2023-53341 of/fdt: run soc memory setup when early_init_dt_scan_memory fails
CVE-2022-50374 Bluetooth: hci_{ldisc,serdev}: check percpu_init_rwsem() failure
CVE-2023-53337 nilfs2: do not write dirty data after degenerating to read-only

Showing top 20 of 56 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53338

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