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Review reviewHigh

CVE-2024-26589

Linux Linux, linux kernel

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=smax...

CVSS
7.8
EPSS
0.24%
15.0% percentile
CISA KEV
Not listed
Published
2024.02.23
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.8

Vulnerability overview

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=smax...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 < 29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0, >= d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 < 4108b86e324da42f7ed425bd71632fd844300dc8, >= d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 < e8d3872b617c21100c5ee4f64e513997a68c2e3d, >= d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 < 1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3, >= d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9 < 22c7fa171a02d310e3a3f6ed46a698ca8a0060ed, >= 4.20, >= 4.20 < 5.15.148, >= 5.16.0 < 6.1.75, >= 6.2.0 < 6.6.14, >= 6.7.0 < 6.7.2
Fixed versions
5.15.148, 6.1.75, 6.6.14, 6.7.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-119