{"id":"CVE-2024-26589","revision":"78c2447b5f394ad0a61aef2455cb2187","records":[{"revision":"78c2447b5f394ad0a61aef2455cb2187","observedAt":"2026-10-30T13:45:33.454+00:00","statement":{"source":"cve-program","id":"CVE-2024-26589","aliases":[],"title":"bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject variable offset alu on PTR_TO_FLOW_KEYS\n\nFor PTR_TO_FLOW_KEYS, check_flow_keys_access() only uses fixed off\nfor validation. However, variable offset ptr alu is not prohibited\nfor this ptr kind. So the variable offset is not checked.\n\nThe following prog is accepted:\n\n func#0 @0\n 0: R1=ctx() R10=fp0\n 0: (bf) r6 = r1 ; R1=ctx() R6_w=ctx()\n 1: (79) r7 = *(u64 *)(r6 +144) ; R6_w=ctx() R7_w=flow_keys()\n 2: (b7) r8 = 1024 ; R8_w=1024\n 3: (37) r8 /= 1 ; R8_w=scalar()\n 4: (57) r8 &= 1024 ; R8_w=scalar(smin=smin32=0,\n smax=umax=smax32=umax32=1024,var_off=(0x0; 0x400))\n 5: (0f) r7 += r8\n mark_precise: frame0: last_idx 5 first_idx 0 subseq_idx -1\n mark_precise: frame0: regs=r8 stack= before 4: (57) r8 &= 1024\n mark_precise: frame0: regs=r8 stack= before 3: (37) r8 /= 1\n mark_precise: frame0: regs=r8 stack= before 2: (b7) r8 = 1024\n 6: R7_w=flow_keys(smin=smin32=0,smax=umax=smax32=umax32=1024,var_off\n =(0x0; 0x400)) R8_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=1024,\n var_off=(0x0; 0x400))\n 6: (79) r0 = *(u64 *)(r7 +0) ; R0_w=scalar()\n 7: (95) exit\n\nThis prog loads flow_keys to r7, and adds the variable offset r8\nto r7, and finally causes out-of-bounds access:\n\n BUG: unable to handle page fault for address: ffffc90014c80038\n [...]\n Call Trace:\n \n bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline]\n __bpf_prog_run include/linux/filter.h:651 [inline]\n bpf_prog_run include/linux/filter.h:658 [inline]\n bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline]\n bpf_flow_dissect+0x15f/0x350 net/core/flow_dissector.c:991\n bpf_prog_test_run_flow_dissector+0x39d/0x620 net/bpf/test_run.c:1359\n bpf_prog_test_run kernel/bpf/syscall.c:4107 [inline]\n __sys_bpf+0xf8f/0x4560 kernel/bpf/syscall.c:5475\n __do_sys_bpf kernel/bpf/syscall.c:5561 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5559 [inline]\n __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:5559\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nFix this by rejecting ptr alu with variable offset on flow_keys.\nApplying the patch rejects the program with \"R7 pointer arithmetic\non flow_keys prohibited\".","state":0,"publishedAt":"2024-02-22T16:13:33.713+00:00","modifiedAt":"2026-10-30T12:17:42.202+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/bpf/verifier.c\"\n ],\n \"versions\": [\n {\n \"version\": \"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9\",\n \"lessThan\": \"7856cb9f0d795ce518a44c5d135dd932cfbfc656\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9\",\n \"lessThan\": \"29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9\",\n \"lessThan\": \"4108b86e324da42f7ed425bd71632fd844300dc8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9\",\n \"lessThan\": \"e8d3872b617c21100c5ee4f64e513997a68c2e3d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9\",\n \"lessThan\": \"1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9\",\n \"lessThan\": \"22c7fa171a02d310e3a3f6ed46a698ca8a0060ed\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"kernel/bpf/verifier.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.20\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.20\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.273\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.148\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.75\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.14\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.7.2\",\n \"lessThanOrEqual\": \"6.7.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.8\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7856cb9f0d795ce518a44c5d135dd932cfbfc656","https://git.kernel.org/stable/c/29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0","https://git.kernel.org/stable/c/4108b86e324da42f7ed425bd71632fd844300dc8","https://git.kernel.org/stable/c/e8d3872b617c21100c5ee4f64e513997a68c2e3d","https://git.kernel.org/stable/c/1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3","https://git.kernel.org/stable/c/22c7fa171a02d310e3a3f6ed46a698ca8a0060ed"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-26589","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-26589","identifiers":["CVE-2024-26589"]},"retained":false,"historicalAffected":[]}],"coverage":[]}