xfs: resample the data fork mapping after cycling ILOCK
Priority LOW 36CWE-362Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: xfs: resample the data fork mapping after cycling ILOCK xfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode, a data fork mapping, and a cow fork mapping. Unfortunately, these two helpers cycle the ILOCK to grab a transaction, which means that the mappings are stale as soon as we reacquire the ILOCK. Currently we refresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but we don't refresh the data fork mapping beforehand, which means that the xfs_bmap_trim_cow in that function queries the refcount btree about the wrong physical blocks and returns an inaccurate value in *shared. If *shared is now false, the directio write proceeds with a stale data fork mapping. Fix this by querying the data fork mapping if the sequence counter changes across the ILOCK cycle.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00467 40th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed Linux (Linux): 5.15.212, 6.1.178, 6.6.145 +4Red Hat: 15 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.11 and later | 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 | Patch available | CNA |
- Linux VendorLinux Affected 4.11 and later Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* | 7.2 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* | 7.2 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.2:rc3:*:*:*:*:*:* | 7.2 rc3 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* Versions 7.2 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* Versions 7.2 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.2:rc3:*:*:*:*:*:* Versions 7.2 rc3 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2
Red Hat 15 advisories
- RHSA-2026:47981 Released 2026-07-29 · Red Hat rating Importantkpatch-patch security update
- Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-687_10_1-1-5.el9_8
- RHSA-2026:47998 Released 2026-07-29 · Red Hat rating Importantkpatch-patch security update
- Red Hat Enterprise Linux BaseOS (v. 8) kpatch-patch-4_18_0-553_109_1-1-8.el8_10, kpatch-patch-4_18_0-553_125_1-1-5.el8_10, kpatch-patch-4_18_0-553_53_1-1-15.el8_10 +2
- RHSA-2026:47983 Released 2026-07-29 · Red Hat rating Importantkpatch-patch security update
- Red Hat Enterprise Linux BaseOS EUS (v.9.6) kpatch-patch-5_14_0-570_116_1-1-6.el9_6, kpatch-patch-5_14_0-570_17_1-1-21.el9_6, kpatch-patch-5_14_0-570_39_1-1-12.el9_6 +2
Show 12 more Red Hat advisories
- RHSA-2026:47997 Released 2026-07-29 · Red Hat rating Importantkpatch-patch security update
- Red Hat Enterprise Linux BaseOS E4S (v.9.2) kpatch-patch-5_14_0-284_117_1-1-18.el9_2, kpatch-patch-5_14_0-284_134_1-1-12.el9_2, kpatch-patch-5_14_0-284_148_1-1-10.el9_2 +2
- RHSA-2026:48016 Released 2026-07-29 · Red Hat rating Importantkpatch-patch security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) kpatch-patch-4_18_0-477_107_1-1-11.el8_8, kpatch-patch-4_18_0-477_120_1-1-10.el8_8, kpatch-patch-4_18_0-477_130_1-1-8.el8_8 +2
- RHSA-2026:47984 Released 2026-07-29 · Red Hat rating Importantkpatch-patch security update
- Red Hat Enterprise Linux BaseOS E4S (v.9.4) kpatch-patch-5_14_0-427_100_1-1-11.el9_4, kpatch-patch-5_14_0-427_113_1-1-9.el9_4, kpatch-patch-5_14_0-427_126_1-1-6.el9_4 +2
- RHSA-2026:46951 Released 2026-07-27 · Red Hat rating Importantkpatch-patch-6_12_0-211_16_1 security update
- Red Hat Enterprise Linux BaseOS (v. 10) kpatch-patch-6_12_0-211_16_1-1-5.el10_2
- RHSA-2026:41229 Released 2026-07-17 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.154.1.el8_8, kernel-4.18.0-477.154.1.el8_8, kernel-abi-stablelists-4.18.0-477.154.1.el8_8 +14
- Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.154.1.el8_8, kernel-4.18.0-477.154.1.el8_8, kernel-abi-stablelists-4.18.0-477.154.1.el8_8 +14
- RHSA-2026:41063 Released 2026-07-16 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.138.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.138.1.el9_4, kernel-64k-devel-5.14.0-427.138.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.138.1.el9_4, kernel-5.14.0-427.138.1.el9_4, kernel-64k-5.14.0-427.138.1.el9_4 +29
- Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.138.1.el9_4, kernel-rt-core-5.14.0-427.138.1.el9_4, kernel-rt-debug-5.14.0-427.138.1.el9_4 +9
- Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.138.1.el9_4, kernel-rt-core-5.14.0-427.138.1.el9_4, kernel-rt-debug-5.14.0-427.138.1.el9_4 +11
- RHSA-2026:41062 Released 2026-07-16 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.89.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.89.1.el10_0, kernel-64k-devel-6.12.0-55.89.1.el10_0 +12
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.89.1.el10_0, kernel-64k-6.12.0-55.89.1.el10_0, kernel-64k-core-6.12.0-55.89.1.el10_0 +28
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.89.1.el10_0, libperf-6.12.0-55.89.1.el10_0
- Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.89.1.el10_0, kernel-rt-64k-6.12.0-55.89.1.el10_0, kernel-rt-64k-core-6.12.0-55.89.1.el10_0 +21
- Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.89.1.el10_0, kernel-rt-core-6.12.0-55.89.1.el10_0, kernel-rt-debug-6.12.0-55.89.1.el10_0 +11
- RHSA-2026:40425 Released 2026-07-16 · Red Hat rating Importantkernel update
- Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.128.1.el9_6, libperf-5.14.0-570.128.1.el9_6
- Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.128.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.128.1.el9_6, kernel-64k-devel-5.14.0-570.128.1.el9_6 +12
- Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.128.1.el9_6, kernel-64k-5.14.0-570.128.1.el9_6, kernel-64k-core-5.14.0-570.128.1.el9_6 +28
- Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.128.1.el9_6, kernel-rt-64k-5.14.0-570.128.1.el9_6, kernel-rt-64k-core-5.14.0-570.128.1.el9_6 +21
- Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.128.1.el9_6, kernel-rt-core-5.14.0-570.128.1.el9_6, kernel-rt-debug-5.14.0-570.128.1.el9_6 +11
- RHSA-2026:39984 Released 2026-07-15 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.198.1.el8_4, kernel-4.18.0-305.198.1.el8_4, kernel-abi-stablelists-4.18.0-305.198.1.el8_4 +14
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.198.1.el8_4, kernel-4.18.0-305.198.1.el8_4, kernel-abi-stablelists-4.18.0-305.198.1.el8_4 +14
- RHSA-2026:39494 Released 2026-07-14 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.34.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.34.1.el10_2, kernel-64k-devel-6.12.0-211.34.1.el10_2 +12
- Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.34.1.el10_2, kernel-64k-6.12.0-211.34.1.el10_2, kernel-64k-core-6.12.0-211.34.1.el10_2 +29
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.34.1.el10_2, libperf-6.12.0-211.34.1.el10_2
- Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.34.1.el10_2, kernel-rt-64k-6.12.0-211.34.1.el10_2, kernel-rt-64k-core-6.12.0-211.34.1.el10_2 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.34.1.el10_2, kernel-rt-core-6.12.0-211.34.1.el10_2, kernel-rt-debug-6.12.0-211.34.1.el10_2 +9
- RHSA-2026:39179 Released 2026-07-14 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.144.1.el8_10, kernel-4.18.0-553.144.1.el8_10, kernel-abi-stablelists-4.18.0-553.144.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.144.1.el8_10
- RHSA-2026:39180 Released 2026-07-14 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.144.1.rt7.485.el8_10, kernel-rt-core-4.18.0-553.144.1.rt7.485.el8_10, kernel-rt-debug-4.18.0-553.144.1.rt7.485.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.144.1.rt7.485.el8_10, kernel-rt-core-4.18.0-553.144.1.rt7.485.el8_10, kernel-rt-debug-4.18.0-553.144.1.rt7.485.el8_10 +7
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| NVIDIA for RHEL 10 | Fixed | — |
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:40425 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:39494 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | — |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | — |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:41063 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:41062 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:40425 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:39494, RHSA-2026:46951 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:39179, RHSA-2026:47998 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:47981 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2026:39984 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | — |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2026:41229, RHSA-2026:48016 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:47997 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:41063, RHSA-2026:47984 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:41062 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:40425, RHSA-2026:47983 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:39984 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) | Fixed | — |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2026:41229 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:39179 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:39494 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | — |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:41062 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2026:39180 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2026:39180 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2026:39494 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | — |
| Red Hat Enterprise Linux Real Time E4S (v.9.2) | Fixed | — |
| Red Hat Enterprise Linux Real Time E4S (v.9.4) | Fixed | RHSA-2026:41063 |
| Red Hat Enterprise Linux Real Time EUS (v. 10.0) | Fixed | RHSA-2026:41062 |
| Red Hat Enterprise Linux Real Time EUS (v.9.6) | Fixed | RHSA-2026:40425 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2026:39494 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | — |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) | Fixed | — |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) | Fixed | RHSA-2026:41063 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) | Fixed | RHSA-2026:41062 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) | Fixed | RHSA-2026:40425 |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-64600
- 2026-10-03 Alias added: GHSA-6p99-w6f4-qcvq
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-20 Weakness changed · CISA ADP
- 2026-10-30 Fix available: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) · Red Hat
References
Exploit 2
Patch 7
- https://git.kernel.org/stable/c/dc11be133efca5fe3a2fb02b016dee825cc12f18
- https://git.kernel.org/stable/c/b8c9aa832b52680ee40d6cab0efb081f9a69df05
- https://git.kernel.org/stable/c/50f0012da1040f69a4e788cd9aed587c9a04983f
- https://git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d78a4ea075
- https://git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47c88078d9
- https://git.kernel.org/stable/c/44f891bc088958399eec27f7604928694aa35581
- https://git.kernel.org/stable/c/2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7
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Sources
- CVE-2026-64600 · CVE Program
- CVE-2026-64600 · NVD
- FIRST EPSS
- GHSA-6p99-w6f4-qcvq · GitHub Advisory Database · CC BY 4.0
- CVE-2026-64600 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences