xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert
In the Linux kernel, the following vulnerability has been resolved: xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert xfrm_hash_rebuild()'s first loop preallocates the bins/chains the reinsert loop needs, so the reinsert (after hlist_del_rcu()) cannot allocate or fail. But its guard is inverted: it skips policies with prefixlen < threshold and preallocates for the rest. prefixlen < threshold is exactly when policy_hash_bysel() returns NULL and the reinsert takes the allocating xfrm_policy_inexact_insert() path. So the loop preallocates for the exact policies (which never allocate) and skips the inexact ones, whose bin/node is then allocated GFP_ATOMIC during reinsert. On failure the error path only WARN_ONCE()s and continues, leaving a poisoned bydst node; the next rebuild's hlist_del_rcu() dereferences LIST_POISON2 and takes a GPF. Reachable under memory pressure, deterministic via failslab. Invert the guard so preallocation covers exactly the reinserted policies; the reinsert then allocates nothing and cannot fail. Crash: Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000024: 0000 [#1] SMP KASAN NOPTI KASAN: maybe wild-memory-access in range [0xdead...] ... Workqueue: events xfrm_hash_rebuild RIP: 0010:xfrm_hash_rebuild+0x5b3/0x1190 RAX: dead000000000122 (LIST_POISON2 + offset) ... Call Trace: hlist_del_rcu (include/linux/rculist.h:599) xfrm_hash_rebuild (net/xfrm/xfrm_policy.c:1365) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) ... Kernel panic - not syncing: Fatal exception in interrupt
- Published
- Aug 5, 2026
- Updated
- Aug 19, 2026
- EPSS
- 0.2% · 6th percentile
- CWE
- —
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Report tools
Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Affected systems
—
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
- 5.0affected
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before e48f4c3e3df35b34be719d72d737bbeaca77cf0caffected · git
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before 1cdeed9df1306f1a277e715600772640d63defa9affected · git
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before 43a4d510523779891cf8eca7ffb4a086b0b5d8bfaffected · git
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before d9d9cc21cc90014724a14c447e3d587be9447107affected · git
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before 94c00391a5117530188334f740ce26d3f1256190affected · git
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before 7acc5ed2f33608a3d83b64f50a5766843b6e2485affected · git
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before 6aa3796d18a9fda953ad76a62b57bf6c145cb9efaffected · git
- 24969facd704a5f0dd8e08da86bf32a9ce972bee and later · before f38f8cce2f7e79775b3db7e8a5eacda04ac908e4affected · git
- before 5.0not 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 6.1.187-1 | 6.1.187-1 |
| Debian:12 | linux-6.12 | before 6.12.101-1~deb12u1 | 6.12.101-1~deb12u1 |
| Debian:13 | linux | before 6.12.101-1 | 6.12.101-1 |
| Debian:14 | linux | before 7.1.6-1 | 7.1.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
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 | 1cdeed9df1306f1a277e715600772640d63defa9 | Vendor (CNA) |
| Linux Linux | 43a4d510523779891cf8eca7ffb4a086b0b5d8bf | Vendor (CNA) |
| Linux Linux | 6aa3796d18a9fda953ad76a62b57bf6c145cb9ef | Vendor (CNA) |
| Linux Linux | 7acc5ed2f33608a3d83b64f50a5766843b6e2485 | Vendor (CNA) |
| Linux Linux | 94c00391a5117530188334f740ce26d3f1256190 | Vendor (CNA) |
| Linux Linux | d9d9cc21cc90014724a14c447e3d587be9447107 | Vendor (CNA) |
| Linux Linux | e48f4c3e3df35b34be719d72d737bbeaca77cf0c | Vendor (CNA) |
| Linux Linux | f38f8cce2f7e79775b3db7e8a5eacda04ac908e4 | Vendor (CNA) |
| azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 | 6.6.150.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.101-1~deb12u1 · Debian:12 | 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.
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
No CVSS vector for this record, so attack conditions can't be derived.
Weakness class (CWE)
—
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.
Noroxi analysis
No Noroxi analysis for this record yet
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We use this product, ask for helpChange log
- Fix✗ → ✓
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References
- git.kernel.org/stable/c/1cdeed9df1306f1a277e715600772640d63defa9
- git.kernel.org/stable/c/43a4d510523779891cf8eca7ffb4a086b0b5d8bf
- git.kernel.org/stable/c/6aa3796d18a9fda953ad76a62b57bf6c145cb9ef
- git.kernel.org/stable/c/7acc5ed2f33608a3d83b64f50a5766843b6e2485
- git.kernel.org/stable/c/94c00391a5117530188334f740ce26d3f1256190
- git.kernel.org/stable/c/d9d9cc21cc90014724a14c447e3d587be9447107
- git.kernel.org/stable/c/e48f4c3e3df35b34be719d72d737bbeaca77cf0c
- git.kernel.org/stable/c/f38f8cce2f7e79775b3db7e8a5eacda04ac908e4
Vendor advisories and official records. Exploit/PoC links are deliberately left out.