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CVE-2026-63994
9.8 CRITICAL
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): High (H)
Activity log
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tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
In the Linux kernel, the following vulnerability has been resolved: tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]() Sashiko found that iptunnel_pmtud_build_icmp() and iptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr() before an skb_cow() call which can reallocate skb->head. Fix this possible UAF by initializing the local variables after the skb_cow() call. Remove skb_reset_network_header() calls which were not needed.
References
Affected products
Linux
- <5.9
- =<6.1.*
- <50750d86a2e5266aba0c295483b3397843198b11
- =<*
- =<5.15.*
- =<5.10.*
- <7254aef4d1a7e18e887af9010e2f2dc34806789b
- =<6.18.*
- <95b6d772bfe788331d9742d73eaa12e113b2adc4
- <bf8b3f34c37c162357138e7c0942723b8b94fed1
- <6dff77899b9e9fe5d854abda3a98ad04e7229ef7
- <b4bc94353050b1fa7b702bd4c6600710dd926cff
- =<6.6.*
- ==5.9
- =<6.12.*
- <76cd9398a0470257ab765bdf5f358a2af2e17934
- =<7.0.*
- <f3f204541f280a6ecb04503a0d6794d93990ca43