CVE-2024-49888— bpf: Fix a sdiv overflow issue
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程序中的sdiv溢出问题，可能导致内核崩溃。
Possible ATT&CK Techniques 3 AI
T1068 · Exploitation for Privilege Escalation T1564.008 · Email Hiding Rules T1203 · Exploitation for Client ExecutionAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | ec0e2da95f72d4a46050a4d994e4fe471474fd80< 4902a6a0dc593c82055fc8c9ada371bafe26c9cc |
affected |
ec0e2da95f72d4a46050a4d994e4fe471474fd80< d22e45a369afc7c28f11acfa5b5e8e478227ca5d |
affected | ||
ec0e2da95f72d4a46050a4d994e4fe471474fd80< 7dd34d7b7dcf9309fc6224caf4dd5b35bedddcb7 |
affected | ||
6.6 |
affected | ||
< 6.6 |
unaffected | ||
6.10.14≤ 6.10.* |
unaffected | ||
6.11.3≤ 6.11.* |
unaffected | ||
6.12≤ * |
unaffected |
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I. Basic Information for CVE-2024-49888
Vulnerability Information
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Vulnerability Title
bpf: Fix a sdiv overflow issue
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix a sdiv overflow issue
Zac Ecob reported a problem where a bpf program may cause kernel crash due
to the following error:
Oops: divide error: 0000 [#1] PREEMPT SMP KASAN PTI
The failure is due to the below signed divide:
LLONG_MIN/-1 where LLONG_MIN equals to -9,223,372,036,854,775,808.
LLONG_MIN/-1 is supposed to give a positive number 9,223,372,036,854,775,808,
but it is impossible since for 64-bit system, the maximum positive
number is 9,223,372,036,854,775,807. On x86_64, LLONG_MIN/-1 will
cause a kernel exception. On arm64, the result for LLONG_MIN/-1 is
LLONG_MIN.
Further investigation found all the following sdiv/smod cases may trigger
an exception when bpf program is running on x86_64 platform:
- LLONG_MIN/-1 for 64bit operation
- INT_MIN/-1 for 32bit operation
- LLONG_MIN%-1 for 64bit operation
- INT_MIN%-1 for 32bit operation
where -1 can be an immediate or in a register.
On arm64, there are no exceptions:
- LLONG_MIN/-1 = LLONG_MIN
- INT_MIN/-1 = INT_MIN
- LLONG_MIN%-1 = 0
- INT_MIN%-1 = 0
where -1 can be an immediate or in a register.
Insn patching is needed to handle the above cases and the patched codes
produced results aligned with above arm64 result. The below are pseudo
codes to handle sdiv/smod exceptions including both divisor -1 and divisor 0
and the divisor is stored in a register.
sdiv:
tmp = rX
tmp += 1 /* [-1, 0] -> [0, 1]
if tmp >(unsigned) 1 goto L2
if tmp == 0 goto L1
rY = 0
L1:
rY = -rY;
goto L3
L2:
rY /= rX
L3:
smod:
tmp = rX
tmp += 1 /* [-1, 0] -> [0, 1]
if tmp >(unsigned) 1 goto L1
if tmp == 1 (is64 ? goto L2 : goto L3)
rY = 0;
goto L2
L1:
rY %= rX
L2:
goto L4 // only when !is64
L3:
wY = wY // only when !is64
L4:
[1] https://lore.kernel.org/bpf/tPJLTEh7S_DxFEqAI2Ji5MBSoZVg7_G-Py2iaZpAaWtM961fFTWtsnlzwvTbzBzaUzwQAoNATXKUlt0LZOFgnDcIyKCswAnAGdUF3LBrhGQ=@protonmail.com/
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程序中的sdiv溢出问题，可能导致内核崩溃。
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
II. Public POCs for CVE-2024-49888
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2024-49888 (1)
Other References for CVE-2024-49888 (1)
Same Patch Batch · Linux · 2024-10-21 · 372 CVEs total
| CVE-2024-47695 | 9.8 CRITICAL | RDMA/rtrs-clt: Reset cid to con_num - 1 to stay in bounds |
| CVE-2022-48985 | 9.8 CRITICAL | net: mana: Fix race on per-CQ variable napi work_done |
| CVE-2024-50033 | 9.8 CRITICAL | slip: make slhc_remember() more robust against malicious packets |
| CVE-2024-50043 | 9.8 CRITICAL | nfsd: fix possible badness in FREE_STATEID |
| CVE-2024-49855 | 9.8 CRITICAL | nbd: fix race between timeout and normal completion |
| CVE-2024-50047 | 9.8 CRITICAL | smb: client: fix UAF in async decryption |
| CVE-2024-50046 | 9.8 CRITICAL | NFSv4: Prevent NULL-pointer dereference in nfs42_complete_copies() |
| CVE-2022-49003 | 9.8 CRITICAL | nvme: fix SRCU protection of nvme_ns_head list |
| CVE-2024-49996 | 9.4 CRITICAL | cifs: Fix buffer overflow when parsing NFS reparse points |
| CVE-2024-47678 | 9.4 CRITICAL | icmp: change the order of rate limits |
| CVE-2024-49950 | 8.8 HIGH | Bluetooth: L2CAP: Fix uaf in l2cap_connect |
| CVE-2024-50041 | 8.8 HIGH | i40e: Fix macvlan leak by synchronizing access to mac_filter_hash |
| CVE-2024-50029 | 8.8 HIGH | Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync |
| CVE-2022-49017 | 8.8 HIGH | tipc: re-fetch skb cb after tipc_msg_validate |
| CVE-2022-48962 | 8.8 HIGH | net: hisilicon: Fix potential use-after-free in hisi_femac_rx() |
| CVE-2022-49015 | 8.8 HIGH | net: hsr: Fix potential use-after-free |
| CVE-2022-48964 | 8.8 HIGH | ravb: Fix potential use-after-free in ravb_rx_gbeth() |
| CVE-2024-49939 | 8.8 HIGH | wifi: rtw89: avoid to add interface to list twice when SER |
| CVE-2022-48960 | 8.8 HIGH | net: hisilicon: Fix potential use-after-free in hix5hd2_rx() |
| CVE-2022-48967 | 8.8 HIGH | NFC: nci: Bounds check struct nfc_target arrays |
Showing top 20 of 372 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98868
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sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
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CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
Same vendor: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2024-49888
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