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CVE-2023-52621— bpf: Check rcu_read_lock_trace_held() before calling bpf map helpers

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，该漏洞源于在调用 bpf 映射助手之前没有检查 rcu_read_lock_trace_held()。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 1e6c62a8821557720a9b2ea9617359b264f2f67c< 82f2df94dac1aa9b879e74d1f82ba1b631bdc612 affected
1e6c62a8821557720a9b2ea9617359b264f2f67c< 3516f93cc63d956e1b290ae4b7bf2586074535a0 affected
1e6c62a8821557720a9b2ea9617359b264f2f67c< d6d6fe4bb105595118f12abeed4a7bdd450853f3 affected
1e6c62a8821557720a9b2ea9617359b264f2f67c< 483cb92334cd7f1d5387dccc0ab5d595d27a669d affected
1e6c62a8821557720a9b2ea9617359b264f2f67c< c7f1b6146f4a46d727c0d046284c28b6882c6304 affected
1e6c62a8821557720a9b2ea9617359b264f2f67c< 169410eba271afc9f0fb476d996795aa26770c6d affected
5.10 affected
< 5.10 unaffected
… +6 more rows
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I. Basic Information for CVE-2023-52621

Vulnerability Information
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Vulnerability Title
bpf: Check rcu_read_lock_trace_held() before calling bpf map helpers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Check rcu_read_lock_trace_held() before calling bpf map helpers These three bpf_map_{lookup,update,delete}_elem() helpers are also available for sleepable bpf program, so add the corresponding lock assertion for sleepable bpf program, otherwise the following warning will be reported when a sleepable bpf program manipulates bpf map under interpreter mode (aka bpf_jit_enable=0): WARNING: CPU: 3 PID: 4985 at kernel/bpf/helpers.c:40 ...... CPU: 3 PID: 4985 Comm: test_progs Not tainted 6.6.0+ #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ...... RIP: 0010:bpf_map_lookup_elem+0x54/0x60 ...... Call Trace: <TASK> ? __warn+0xa5/0x240 ? bpf_map_lookup_elem+0x54/0x60 ? report_bug+0x1ba/0x1f0 ? handle_bug+0x40/0x80 ? exc_invalid_op+0x18/0x50 ? asm_exc_invalid_op+0x1b/0x20 ? __pfx_bpf_map_lookup_elem+0x10/0x10 ? rcu_lockdep_current_cpu_online+0x65/0xb0 ? rcu_is_watching+0x23/0x50 ? bpf_map_lookup_elem+0x54/0x60 ? __pfx_bpf_map_lookup_elem+0x10/0x10 ___bpf_prog_run+0x513/0x3b70 __bpf_prog_run32+0x9d/0xd0 ? __bpf_prog_enter_sleepable_recur+0xad/0x120 ? __bpf_prog_enter_sleepable_recur+0x3e/0x120 bpf_trampoline_6442580665+0x4d/0x1000 __x64_sys_getpgid+0x5/0x30 ? do_syscall_64+0x36/0xb0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 </TASK>
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，该漏洞源于在调用 bpf 映射助手之前没有检查 rcu_read_lock_trace_held()。
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 1e6c62a8821557720a9b2ea9617359b264f2f67c ~ 82f2df94dac1aa9b879e74d1f82ba1b631bdc612 -
Linux Linux 5.10 -

II. Public POCs for CVE-2023-52621

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III. Intelligence Information for CVE-2023-52621

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Patches & Fixes for CVE-2023-52621 (2)

Other References for CVE-2023-52621 (3)

Same Patch Batch · Linux · 2024-03-26 · 13 CVEs total

CVE-2023-52623 7.8 HIGH SUNRPC: Fix a suspicious RCU usage warning
CVE-2024-26646 7.8 HIGH thermal: intel: hfi: Add syscore callbacks for system-wide PM
CVE-2024-26644 btrfs: don't abort filesystem when attempting to snapshot deleted subvolume
CVE-2024-26645 tracing: Ensure visibility when inserting an element into tracing_map
CVE-2023-52622 ext4: avoid online resizing failures due to oversized flex bg
CVE-2023-52624 drm/amd/display: Wake DMCUB before executing GPINT commands
CVE-2023-52625 drm/amd/display: Refactor DMCUB enter/exit idle interface
CVE-2023-52626 net/mlx5e: Fix operation precedence bug in port timestamping napi_poll context
CVE-2023-52627 iio: adc: ad7091r: Allow users to configure device events
CVE-2024-26647 drm/amd/display: Fix late derefrence 'dsc' check in 'link_set_dsc_pps_packet()'
CVE-2024-26648 drm/amd/display: Fix variable deferencing before NULL check in edp_setup_replay()
CVE-2024-26649 drm/amdgpu: Fix the null pointer when load rlc firmware

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52621

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