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Review reviewHigh

CVE-2026-52942

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls...

CVSS
7.1
EPSS
0.13%
2.63% percentile
CISA KEV
Not listed
Published
2026.06.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 2e96e1bc9b4d5450e6c33f078e19a9bc1dda6c0b, >= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < d704ee9c7bc68a161684c51a7ac05b446dcf38d4, >= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < befb8968a2abdfa948d5600ea7f7a509a292a590, >= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 8a81e336da685423f5b64aac4d571e63d674c52a, >= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < c38d41134085193efd5b237cf513ad5b3421a60d, >= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < af1b7699466f6556b351fa25d3dc870abfb5d310, >= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 65ef7397eb9a296e91839f5fd10be96f23d332e7, >= 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < a84b6fedbc97078788be78dbdd7517d143ad1a77, >= 2.6.36, >= 2.6.36 < 5.15.210, >= 5.16 < 6.1.176, >= 6.2 < 6.6.143, >= 6.7 < 6.12.94, >= 6.13 < 6.18.36, >= 6.19 < 7.0.13, 7.1
Fixed versions
5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13

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:N/A:H
CWE
CWE-125