Answer in brief
CVE-2024-26589 records a High severity (CVSS 7.8) vulnerability in bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0 || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <4108b86e324da42f7ed425bd71632fd844300dc8 || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <e8d3872b617c21100c5ee4f64e513997a68c2e3d || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3 || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <22c7fa171a02d310e3a3f6ed46a698ca8a0060ed | 29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0, 4108b86e324da42f7ed425bd71632fd844300dc8, e8d3872b617c21100c5ee4f64e513997a68c2e3d, 1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3, 22c7fa171a02d310e3a3f6ed46a698ca8a0060ed |
| Linux/Linuxgeneric | 4.20 | Not reported |
| Linux/Linuxgeneric | >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <7856cb9f0d795ce518a44c5d135dd932cfbfc656 || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0 || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <4108b86e324da42f7ed425bd71632fd844300dc8 || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <e8d3872b617c21100c5ee4f64e513997a68c2e3d || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3 || >=d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 <22c7fa171a02d310e3a3f6ed46a698ca8a0060ed | 7856cb9f0d795ce518a44c5d135dd932cfbfc656, 29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0, 4108b86e324da42f7ed425bd71632fd844300dc8, e8d3872b617c21100c5ee4f64e513997a68c2e3d, 1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3, 22c7fa171a02d310e3a3f6ed46a698ca8a0060ed |
Published upstream
Feb 22, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS For PTR_TO_FLOW_KEYS, check_flow_keys_access() only uses fixed off for validation. However, variable offset ptr alu is not prohibited for this ptr kind. So the variable offset is not checked. The following prog is accepted: func#0 @0 0: R1=ctx() R10=fp0 0: (bf) r6 = r1 ; R1=ctx() R6_w=ctx() 1: (79) r7 = *(u64 *)(r6 +144) ; R6_w=ctx() R7_w=flow_keys() 2: (b7) r8 = 1024 ; R8_w=1024 3: (37) r8 /= 1 ; R8_w=scalar() 4: (57) r8 &= 1024 ; R8_w=scalar(smin=smin32=0, smax=umax=smax32=umax32=1024,var_off=(0x0; 0x400)) 5: (0f) r7 += r8 mark_precise: frame0: last_idx 5 first_idx 0 subseq_idx -1 mark_precise: frame0: regs=r8 stack= before 4: (57) r8 &= 1024 mark_precise: frame0: regs=r8 stack= before 3: (37) r8 /= 1 mark_precise: frame0: regs=r8 stack= before 2: (b7) r8 = 1024 6: R7_w=flow_keys(smin=smin32=0,smax=umax=smax32=umax32=1024,var_off =(0x0; 0x400)) R8_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=1024, var_off=(0x0; 0x400)) 6: (79) r0 = *(u64 *)(r7 +0) ; R0_w=scalar() 7: (95) exit This prog loads flow_keys to r7, and adds the variable offset r8 to r7, and finally causes out-of-bounds access: BUG: unable to handle page fault for address: ffffc90014c80038 [...] Call Trace: <TASK> bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] bpf_flow_dissect+0x15f/0x350 net/core/flow_dissector.c:991 bpf_prog_test_run_flow_dissector+0x39d/0x620 net/bpf/test_run.c:1359 bpf_prog_test_run kernel/bpf/syscall.c:4107 [inline] __sys_bpf+0xf8f/0x4560 kernel/bpf/syscall.c:5475 __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:5559 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Fix this by rejecting ptr alu with variable offset on flow_keys. Applying the patch rejects the program with "R7 pointer arithmetic on flow_keys prohibited".
Quoted source text, attributed separately from HOL analysis.