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CVE-2023-52523— bpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets

EPSS 0.01% · P1

Affected Version Matrix 10

VendorProductVersion RangeStatus
LinuxLinux122e6c79efe1c25816118aca9cfabe54e99c2432< bc8b89b6963803a123f64aa9494155a037b3d728affected
122e6c79efe1c25816118aca9cfabe54e99c2432< b8f97e47b6fb84fcf2f5a22e725eefb6cf5070c2affected
122e6c79efe1c25816118aca9cfabe54e99c2432< ded6e448028f0f91b6af35985afca01fa02a9089affected
122e6c79efe1c25816118aca9cfabe54e99c2432< b80e31baa43614e086a9d29dc1151932b1bd7fc5affected
5.13affected
< 5.13unaffected
5.15.135≤ 5.15.*unaffected
6.1.57≤ 6.1.*unaffected
… +2 more rows
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I. Basic Information for CVE-2023-52523

Vulnerability Information
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Vulnerability Title
bpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Reject sk_msg egress redirects to non-TCP sockets With a SOCKMAP/SOCKHASH map and an sk_msg program user can steer messages sent from one TCP socket (s1) to actually egress from another TCP socket (s2): tcp_bpf_sendmsg(s1) // = sk_prot->sendmsg tcp_bpf_send_verdict(s1) // __SK_REDIRECT case tcp_bpf_sendmsg_redir(s2) tcp_bpf_push_locked(s2) tcp_bpf_push(s2) tcp_rate_check_app_limited(s2) // expects tcp_sock tcp_sendmsg_locked(s2) // ditto There is a hard-coded assumption in the call-chain, that the egress socket (s2) is a TCP socket. However in commit 122e6c79efe1 ("sock_map: Update sock type checks for UDP") we have enabled redirects to non-TCP sockets. This was done for the sake of BPF sk_skb programs. There was no indention to support sk_msg send-to-egress use case. As a result, attempts to send-to-egress through a non-TCP socket lead to a crash due to invalid downcast from sock to tcp_sock: BUG: kernel NULL pointer dereference, address: 000000000000002f ... Call Trace: <TASK> ? show_regs+0x60/0x70 ? __die+0x1f/0x70 ? page_fault_oops+0x80/0x160 ? do_user_addr_fault+0x2d7/0x800 ? rcu_is_watching+0x11/0x50 ? exc_page_fault+0x70/0x1c0 ? asm_exc_page_fault+0x27/0x30 ? tcp_tso_segs+0x14/0xa0 tcp_write_xmit+0x67/0xce0 __tcp_push_pending_frames+0x32/0xf0 tcp_push+0x107/0x140 tcp_sendmsg_locked+0x99f/0xbb0 tcp_bpf_push+0x19d/0x3a0 tcp_bpf_sendmsg_redir+0x55/0xd0 tcp_bpf_send_verdict+0x407/0x550 tcp_bpf_sendmsg+0x1a1/0x390 inet_sendmsg+0x6a/0x70 sock_sendmsg+0x9d/0xc0 ? sockfd_lookup_light+0x12/0x80 __sys_sendto+0x10e/0x160 ? syscall_enter_from_user_mode+0x20/0x60 ? __this_cpu_preempt_check+0x13/0x20 ? lockdep_hardirqs_on+0x82/0x110 __x64_sys_sendto+0x1f/0x30 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Reject selecting a non-TCP sockets as redirect target from a BPF sk_msg program to prevent the crash. When attempted, user will receive an EACCES error from send/sendto/sendmsg() syscall.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于内核空指针取消引用。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 122e6c79efe1c25816118aca9cfabe54e99c2432 ~ bc8b89b6963803a123f64aa9494155a037b3d728 -
LinuxLinux 5.13 -

II. Public POCs for CVE-2023-52523

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III. Intelligence Information for CVE-2023-52523

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Same Patch Batch · Linux · 2024-03-02 · 57 CVEs total

CVE-2023-52563drm/meson: fix memory leak on ->hpd_notify callback
CVE-2023-52581netfilter: nf_tables: fix memleak when more than 255 elements expired
CVE-2023-52574team: fix null-ptr-deref when team device type is changed
CVE-2023-52578net: bridge: use DEV_STATS_INC()
CVE-2023-52577dccp: fix dccp_v4_err()/dccp_v6_err() again
CVE-2023-52576x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer()
CVE-2023-52580net/core: Fix ETH_P_1588 flow dissector
CVE-2023-52566nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()
CVE-2023-52565media: uvcvideo: Fix OOB read
CVE-2023-52564Revert "tty: n_gsm: fix UAF in gsm_cleanup_mux"
CVE-2023-52567serial: 8250_port: Check IRQ data before use
CVE-2023-52562mm/slab_common: fix slab_caches list corruption after kmem_cache_destroy()
CVE-2023-52561arm64: dts: qcom: sdm845-db845c: Mark cont splash memory region as reserved
CVE-2023-52560mm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions()
CVE-2023-52559iommu/vt-d: Avoid memory allocation in iommu_suspend()
CVE-2023-52518Bluetooth: hci_codec: Fix leaking content of local_codecs
CVE-2023-52532net: mana: Fix TX CQE error handling
CVE-2023-52531wifi: iwlwifi: mvm: Fix a memory corruption issue
CVE-2023-52530wifi: mac80211: fix potential key use-after-free
CVE-2023-52529HID: sony: Fix a potential memory leak in sony_probe()

Showing top 20 of 57 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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