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CVE-2026-98573

Unknown

Last modified

CVE-2026-98573 is a vulnerability of currently unknown severity. 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.

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < 9c4e432132a97b82edf28fa172c39f743e6bfb26; >= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < 718747afa5463d9cc5fd9a09f03b2a492edd9b78; >= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < a0ad0473c09d2e947aecac5c82e637ec85924b12; >= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < b2da5ed3d8c75e1b729a21b6d3beaed415e263f6; >= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < 6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b; >= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962; >= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < d7f474226809471dc7877435e9c492cc914df0bf; >= 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < 3b4e0b0c008a8c1b474730248cd5b873026c74bd
LinuxLinux3.13

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98573?
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.
How severe is CVE-2026-98573?
Severity scoring for CVE-2026-98573 is pending analysis.
How do I fix CVE-2026-98573?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST