In the Linux kernel, the following vulnerability has been resolved: ipv4: validate checksum_start before completing…
Linux · Linux
A critical improper input validation vulnerability in the Linux kernel allows packets with bad checksum metadata to corrupt the network header via skb_checksum_help. Linux kernel users are affected.
In the Linux kernel, the following vulnerability has been resolved: ipv4: validate checksum_start before completing checksum If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of mischief. This was discovered and reported by Paulos, and has been reporoduced by others independently since. We really shouldn't allow such packets in, but as a defence in depth measure, let's also check before we complete the checksum. A more complete validation at input is forthcoming, but needs more work.
- Exploited
- Yes, in VulnCheck KEV
- Reports
- 0
- Tactics
- 0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 4 days after disclosure. Public exploit code (PoC-in-GitHub) appeared 1 day after disclosure.
- Disclosedday 0
- Public exploit codePoC-in-GitHub+1 day
- First seen exploitedVulnCheck KEV evidence+4 days
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linkedNo ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
What security researchers reported
Not named in any threat report yetAlso mentioned in 11 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- SUSE Ships Another Kernel Update Closing Twenty Seven New Linux Flaws30 Oct 2026
- Known_Cve | Oct 24, 2026 | Part 1/323 Oct 2026
- Known_Cve | Oct 23, 2026 | Part 1/322 Oct 2026
- Known_Cve | Oct 22, 2026 | Part 2/421 Oct 2026
- Known_Cve | Oct 21, 2026 | Part 3/420 Oct 2026
- Known_Cve | Oct 20, 2026 | Part 3/419 Oct 2026
- 5 more on OTX