tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()
In the Linux kernel, the following vulnerability has been resolved: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set. This triggers an out-of-bound access, because (typeof(skb->transport_header))~0U is 65535. Access the icmp header based on IPv4 network header, after making sure icmp->type is present in skb linear part. Note that iptunnel_pmtud_check_icmpv6()) is fine.
- Published
- Jul 19, 2026
- Updated
- Oct 7, 2026
- EPSS
- 0.5% · 42th percentile
- CWE
- CWE-125
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Report tools
Action score
36
Monitor
Low priority for now.
- CVSS
- 36 / 40 · 9.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.1
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.9 and later · before 5.10.259
- linux linux kernel5.11 and later · before 5.15.210
- linux linux kernel5.16 and later · before 6.1.176
- linux linux kernel6.2 and later · before 6.6.143
- linux linux kernel6.7 and later · before 6.12.93
- linux linux kernel6.13 and later · before 6.18.35
- linux linux kernel6.19 and later · before 7.0.12
- linux linux kernel7.1
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 5.9affected
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before 5a92cb45e34749865d03daf8d3500f77b5f6644caffected · git
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before c7b7ec3e69e673c0d6b57f74d21da50c485c598eaffected · git
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before 7f4f7efe7f30edd29c4988de01728bf2398217e4affected · git
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before e917d0c69f01af2bb4fbea2b66d560a53b3ac7ecaffected · git
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before a096b6e34f602950af9a2b0856cd93a5f4c276d7affected · git
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before 43368636c663cff6e59dde93cf4b8e43ac28eb93affected · git
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before cb549df9ce4ee15c9d5b19ddab12cf2128e4313caffected · git
- 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before 509323077ef79a26ba0c60bb556e45c12c398b2daffected · git
- before 5.9not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.171.1.el8_10 | 4.18.0-553.171.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
| AlmaLinux:8 | kernel-rt-modules | before 4.18.0-553.171.1.rt7.512.el8_10 | 4.18.0-553.171.1.rt7.512.el8_10 |
+65
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 43368636c663cff6e59dde93cf4b8e43ac28eb93 | Vendor (CNA) |
| Linux Linux | 509323077ef79a26ba0c60bb556e45c12c398b2d | Vendor (CNA) |
| Linux Linux | 5a92cb45e34749865d03daf8d3500f77b5f6644c | Vendor (CNA) |
| Linux Linux | 7f4f7efe7f30edd29c4988de01728bf2398217e4 | Vendor (CNA) |
| Linux Linux | a096b6e34f602950af9a2b0856cd93a5f4c276d7 | Vendor (CNA) |
| Linux Linux | c7b7ec3e69e673c0d6b57f74d21da50c485c598e | Vendor (CNA) |
| Linux Linux | cb549df9ce4ee15c9d5b19ddab12cf2128e4313c | Vendor (CNA) |
| Linux Linux | e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec | Vendor (CNA) |
| almalinux:bpftool | 4.18.0-553.171.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel | 4.18.0-553.171.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-core | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-core | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-devel | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-modules | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-modules-extra | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-devel | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-modules | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-modules-extra | 4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-rt | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-core | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-core | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-debuginfo | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-devel | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-kvm | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-modules | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-modules-extra | 0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
+5
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/43368636c663cff6e59dde93cf4b8e43ac28eb93
- git.kernel.org/stable/c/509323077ef79a26ba0c60bb556e45c12c398b2d
- git.kernel.org/stable/c/5a92cb45e34749865d03daf8d3500f77b5f6644c
- git.kernel.org/stable/c/7f4f7efe7f30edd29c4988de01728bf2398217e4
- git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5f4c276d7
- git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c485c598e
- git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf2128e4313c
- git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec
Vendor advisories and official records. Exploit/PoC links are deliberately left out.