- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: icmp: fix NULL pointer dereference in icmp_tag_validation() icmp_tag_validation() unconditionally dereferences the result of rcu_dereference(inet_protos[proto]) without checking for NULL. The inet_protos[] array is sparse -- only about 15 of 256 protocol numbers have registered handlers. When ip_no_pmtu_disc is set to 3 (hardened PMTU mode) and the kernel receives an ICMP Fragmentation Needed error with a quoted inner IP header containing an unregistered protocol number, the NULL dereference causes a kernel panic in softirq context. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:icmp_unreach (net/ipv4/icmp.c:1085 net/ipv4/icmp.c:1143) Call Trace: <IRQ> icmp_rcv (net/ipv4/icmp.c:1527) ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207) ip_local_deliver_finish (net/ipv4/ip_input.c:242) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) __netif_receive_skb_one_core (net/core/dev.c:6164) process_backlog (net/core/dev.c:6628) handle_softirqs (kernel/softirq.c:561) </IRQ> Add a NULL check before accessing icmp_strict_tag_validation. If the protocol has no registered handler, return false since it cannot perform strict tag validation.
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (9 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < 571d9d7b650f02d1e38c01128817868bceac9edd
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < d783fa413c702ff0f8f8bea63f862e28eeaf39e3
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < 1f9f2c6d4b2a613b7756fc5679c5116ba2ca0161
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < b61529c357f1ee4d64836eb142a542d2e7ad67ce
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < 9647e99d2a617c355d2b378be0ff6d0e848fd579
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < d938dd5a0ad780c891ea3bc94cae7405f11e618a
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < 1e4e2f5e48cec0cccaea9815fb9486c084ba41e2
- affected 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e – < 614aefe56af8e13331e50220c936fc0689cf5675
- affected 3.14
- unaffected < 3.14
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.20 – ≤ 6.18.*
- unaffected 6.19.10 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
12
- https://git.kernel.org/stable/c/571d9d7b650f02d1e38c01128817868bceac9edd (opens in a new tab)
- https://git.kernel.org/stable/c/d783fa413c702ff0f8f8bea63f862e28eeaf39e3 (opens in a new tab)
- https://git.kernel.org/stable/c/1f9f2c6d4b2a613b7756fc5679c5116ba2ca0161 (opens in a new tab)
- https://git.kernel.org/stable/c/b61529c357f1ee4d64836eb142a542d2e7ad67ce (opens in a new tab)
- https://git.kernel.org/stable/c/9647e99d2a617c355d2b378be0ff6d0e848fd579 (opens in a new tab)
- https://git.kernel.org/stable/c/d938dd5a0ad780c891ea3bc94cae7405f11e618a (opens in a new tab)
- https://git.kernel.org/stable/c/1e4e2f5e48cec0cccaea9815fb9486c084ba41e2 (opens in a new tab)
- https://git.kernel.org/stable/c/614aefe56af8e13331e50220c936fc0689cf5675 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-16158 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-23398)Record last updated .