Answer in brief
CVE-2026-98573 records a Unknown severity vulnerability in net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6(). The current sources do not mark it as known exploited. The current feed maps 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.
A CVSS score is not reported in the current record. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <9c4e432132a97b82edf28fa172c39f743e6bfb26 || >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <718747afa5463d9cc5fd9a09f03b2a492edd9b78 || >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <a0ad0473c09d2e947aecac5c82e637ec85924b12 || >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <b2da5ed3d8c75e1b729a21b6d3beaed415e263f6 || >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b || >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962 || >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <d7f474226809471dc7877435e9c492cc914df0bf || >=1431fb31ecbaba1b5718006128f0f2ed0b94e1c3 <3b4e0b0c008a8c1b474730248cd5b873026c74bd | 9c4e432132a97b82edf28fa172c39f743e6bfb26, 718747afa5463d9cc5fd9a09f03b2a492edd9b78, a0ad0473c09d2e947aecac5c82e637ec85924b12, b2da5ed3d8c75e1b729a21b6d3beaed415e263f6, 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b, cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962, d7f474226809471dc7877435e9c492cc914df0bf, 3b4e0b0c008a8c1b474730248cd5b873026c74bd |
| Linux/Linuxgeneric | 3.13 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() skb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max argument and passes the result to __pskb_pull_tail() as a signed int. The function does not ensure that max is at least skb_headlen(skb). This can happen while parsing IPv6 extension headers when an skb already has a linear area larger than MAX_IPV6_HDR_LEN. Once the parser needs data beyond the linear area, max - skb_headlen(skb) wraps and is converted to a negative delta. __pskb_pull_tail() then passes that negative length to skb_copy_bits(), where it can become a very large copy length. Pass the requested length itself as the pull bound at the three extension-header call sites, so the delta can no longer go negative.
Quoted source text, attributed separately from HOL analysis.