{"id":"AZL-52913","summary":"CVE-2024-49888 affecting package kernel 5.15.200.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a sdiv overflow issue\n\nZac Ecob reported a problem where a bpf program may cause kernel crash due\nto the following error:\n  Oops: divide error: 0000 [#1] PREEMPT SMP KASAN PTI\n\nThe failure is due to the below signed divide:\n  LLONG_MIN/-1 where LLONG_MIN equals to -9,223,372,036,854,775,808.\nLLONG_MIN/-1 is supposed to give a positive number 9,223,372,036,854,775,808,\nbut it is impossible since for 64-bit system, the maximum positive\nnumber is 9,223,372,036,854,775,807. On x86_64, LLONG_MIN/-1 will\ncause a kernel exception. On arm64, the result for LLONG_MIN/-1 is\nLLONG_MIN.\n\nFurther investigation found all the following sdiv/smod cases may trigger\nan exception when bpf program is running on x86_64 platform:\n  - LLONG_MIN/-1 for 64bit operation\n  - INT_MIN/-1 for 32bit operation\n  - LLONG_MIN%-1 for 64bit operation\n  - INT_MIN%-1 for 32bit operation\nwhere -1 can be an immediate or in a register.\n\nOn arm64, there are no exceptions:\n  - LLONG_MIN/-1 = LLONG_MIN\n  - INT_MIN/-1 = INT_MIN\n  - LLONG_MIN%-1 = 0\n  - INT_MIN%-1 = 0\nwhere -1 can be an immediate or in a register.\n\nInsn patching is needed to handle the above cases and the patched codes\nproduced results aligned with above arm64 result. The below are pseudo\ncodes to handle sdiv/smod exceptions including both divisor -1 and divisor 0\nand the divisor is stored in a register.\n\nsdiv:\n      tmp = rX\n      tmp += 1 /* [-1, 0] -\u003e [0, 1]\n      if tmp \u003e(unsigned) 1 goto L2\n      if tmp == 0 goto L1\n      rY = 0\n  L1:\n      rY = -rY;\n      goto L3\n  L2:\n      rY /= rX\n  L3:\n\nsmod:\n      tmp = rX\n      tmp += 1 /* [-1, 0] -\u003e [0, 1]\n      if tmp \u003e(unsigned) 1 goto L1\n      if tmp == 1 (is64 ? goto L2 : goto L3)\n      rY = 0;\n      goto L2\n  L1:\n      rY %= rX\n  L2:\n      goto L4  // only when !is64\n  L3:\n      wY = wY  // only when !is64\n  L4:\n\n  [1] https://lore.kernel.org/bpf/tPJLTEh7S_DxFEqAI2Ji5MBSoZVg7_G-Py2iaZpAaWtM961fFTWtsnlzwvTbzBzaUzwQAoNATXKUlt0LZOFgnDcIyKCswAnAGdUF3LBrhGQ=@protonmail.com/","modified":"2026-04-01T05:17:55.128427Z","published":"2024-10-21T18:15:11Z","upstream":["CVE-2024-49888"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49888"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:2","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"5.15.200.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-52913.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}