CVE-2026-45886: bpf: Fix bpf_xdp_store_bytes proto for read-only arg
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 0db169a91381a473b7974021d1c02f8da72c5775, 57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52, 6557f1565d779851c4db9c488c49c05a47a6e72f.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 0db169a91381a473b7974021d1c02f8da72c5775, 57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52, 6557f1565d779851c4db9c488c49c05a47a6e72f or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_xdp_store_bytes proto for read-only arg While making some maps in Cilium read-only from the BPF side, we noticed that the bpf_xdp_store_bytes proto is incorrect. In particular, the verifier was throwing the following error: ; ret = ctx_store_bytes(ctx, l3_off + offsetof(struct iphdr, saddr), &nat->address, 4, 0); 635: (79) r1 = *(u64 *)(r10 -144) ; R1=ctx() R10=fp0 fp-144=ctx() 636: (b4) w2 = 26 ; R2=26 637: (b4) w4 = 4 ; R4=4 638: (b4) w5 = 0 ; R5=0 639: (85) call bpf_xdp_store_bytes#190 write into map forbidden, value_size=6 off=0 size=4 nat comes from a BPF_F_RDONLY_PROG map, so R3 is a PTR_TO_MAP_VALUE. The verifier checks the helper's memory access to R3 in check_mem_size_reg, as it reaches ARG_CONST_SIZE argument. The third argument has expected type ARG_PTR_TO_UNINIT_MEM, which includes the MEM_WRITE flag. The verifier thus checks for a BPF_WRITE access on R3. Given R3 points to a read-only map, the check fails. Conversely, ARG_PTR_TO_UNINIT_MEM can also lead to the helper reading from uninitialized memory. This patch simply fixes the expected argument type to match that of bpf_skb_store_bytes.
- Published
- May 27, 2026
- Updated
- Nov 6, 2026
- EPSS
- 0.1% · 5th percentile
- CWE
- CWE-908
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| 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 kernel5.18 and later · before 6.1.165
- linux linux kernel6.2 and later · before 6.6.128
- linux linux kernel6.7 and later · before 6.12.75
- linux linux kernel6.13 and later · before 6.18.14
- linux linux kernel6.19 and later · before 6.19.4
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
- 5.18affected
- 3f364222d032eea6b245780e845ad213dab28cdd and later · before ffb5d1c5e3933b947fc7303ad68bf0c536d0c85eaffected · git
- 3f364222d032eea6b245780e845ad213dab28cdd and later · before ddc34a1b85505c919026ddc82fafdada9a160b15affected · git
- 3f364222d032eea6b245780e845ad213dab28cdd and later · before 0db169a91381a473b7974021d1c02f8da72c5775affected · git
- 3f364222d032eea6b245780e845ad213dab28cdd and later · before d7b87adeb0eb539b9b824b101bb14fb01e41240baffected · git
- 3f364222d032eea6b245780e845ad213dab28cdd and later · before 57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52affected · git
- 3f364222d032eea6b245780e845ad213dab28cdd and later · before 6557f1565d779851c4db9c488c49c05a47a6e72faffected · git
- before 5.18not affected · semver
- 6.1.165 and later · up to and including 6.1.*not affected · semver
- 6.6.128 and later · up to and including 6.6.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.170-1 | 6.1.170-1 |
| Debian:13 | linux | before 6.12.85-1 | 6.12.85-1 |
| Debian:14 | linux | before 6.18.14-1 | 6.18.14-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.172.2 | 5.14.21-150500.55.172.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.172.1 | 5.14.21-150500.55.172.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.172.2 | 5.14.21-150500.55.172.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.172.1 | 5.14.21-150500.55.172.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_42 | before 1-150500.11.3.2 | 1-150500.11.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.118.1 | 6.4.0-150600.23.118.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_28 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.172.2 | 5.14.21-150500.55.172.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.172.2.150500.6.81.2 | 5.14.21-150500.55.172.2.150500.6.81.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-rt | before 5.14.21-150500.13.146.1 | 5.14.21-150500.13.146.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-source | before 5.14.21-150500.55.172.2 | 5.14.21-150500.55.172.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-source-rt | before 5.14.21-150500.13.146.1 | 5.14.21-150500.13.146.1 |
| SUSE:Linux Enterprise Server 15 SP5-LTSS | kernel-zfcpdump | before 5.14.21-150500.55.172.2 | 5.14.21-150500.55.172.2 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-64kb | before 6.4.0-150600.23.118.1 | 6.4.0-150600.23.118.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-default-base | before 6.4.0-150600.23.118.1.150600.12.56.1 | 6.4.0-150600.23.118.1.150600.12.56.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-docs | before 6.4.0-150600.23.118.1 | 6.4.0-150600.23.118.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-obs-build | before 6.4.0-150600.23.118.1 | 6.4.0-150600.23.118.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-source | before 6.4.0-150600.23.118.1 | 6.4.0-150600.23.118.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-syms | before 6.4.0-150600.23.118.1 | 6.4.0-150600.23.118.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-zfcpdump | before 6.4.0-150600.23.118.1 | 6.4.0-150600.23.118.1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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
Published before and after this one in the same product
- ← EarlierCVE-2026-45878May 27, 2026 · drm/amdkfd: Fix watch_id bounds checking in debug address watch v231Monitor
- ← EarlierCVE-2026-45880May 27, 2026 · PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails22Monitor
- Later →CVE-2026-45888May 27, 2026 · md/raid1: fix memory leak in raid1_run()22Monitor
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 | 0db169a91381a473b7974021d1c02f8da72c5775 | Vendor (CNA) |
| Linux Linux | 57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52 | Vendor (CNA) |
| Linux Linux | 6557f1565d779851c4db9c488c49c05a47a6e72f | Vendor (CNA) |
| Linux Linux | d7b87adeb0eb539b9b824b101bb14fb01e41240b | Vendor (CNA) |
| Linux Linux | ddc34a1b85505c919026ddc82fafdada9a160b15 | Vendor (CNA) |
| Linux Linux | ffb5d1c5e3933b947fc7303ad68bf0c536d0c85e | Vendor (CNA) |
| debian:linux | 6.1.170-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.118.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-default | 6.4.0-150600.23.118.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.118.1.150600.12.56.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-docs | 6.4.0-150600.23.118.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_42 | 1-150500.11.3.2 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_28 | 1-150600.13.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.118.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150500.13.146.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-source | 6.4.0-150600.23.118.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150500.13.146.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-syms | 6.4.0-150600.23.118.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.4.0-150600.23.118.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
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.
No history yet (it accumulates with the daily EPSS job).
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.
- CVE-2026-5298928 days apartnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers39Monitor
- CVE-2026-5322529 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()36Monitor
- CVE-2026-5317029 days apartaccel/ethosu: reject DMA commands with uninitialized length35Monitor
- CVE-2026-4313921 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()34Monitor
- CVE-2026-4329119 days apartnet: nfc: nci: Fix parameter validation for packet data33Monitor
- CVE-2026-4345619 days apartbonding: fix type confusion in bond_setup_by_slave()31Monitor
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0290 · Jun 2, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-908 · Use of Uninitialized ResourceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- git.kernel.org/stable/c/57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52
- git.kernel.org/stable/c/6557f1565d779851c4db9c488c49c05a47a6e72f
- git.kernel.org/stable/c/d7b87adeb0eb539b9b824b101bb14fb01e41240b
- git.kernel.org/stable/c/ddc34a1b85505c919026ddc82fafdada9a160b15
- git.kernel.org/stable/c/ffb5d1c5e3933b947fc7303ad68bf0c536d0c85e
Vendor advisories and official records. Exploit/PoC links are deliberately left out.