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TI-2026-52363 Aliases CVE-2026-74580GHSA-mr6w-hqp3-cg59

vhost: reset the vring metadata cache on vring reconfiguration

Priority HIGH 73Published · 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
Partial Red Hat: 41 fixed, 1 without a fix

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: vhost: reset the vring metadata cache on vring reconfiguration vq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring metadata region, and iotlb_access_ok() returns early on a cache hit, taking the hit as proof that the region has already been validated: if (vhost_vq_meta_fetch(vq, addr, len, type)) return true; The cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on device IOTLB (re)initialisation and on vq reset, but not when VHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when VHOST_SET_VRING_NUM changes the region sizes. With a device IOTLB attached both ioctls are accepted while the vq is live, and neither validates the addresses at ioctl time: vq_access_ok() and vq_log_used_access_ok() return true early because the addresses are GIOVAs, deferring validation to prefetch time. Once the cache has been populated that deferred validation no longer runs -- vq_meta_prefetch() hits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps translating through the old mapping as map->addr + addr - map->start for an address the mapping no longer covers. vhost_copy_to_user() and vhost_copy_from_user() consume the result with __copy_to_user() and __copy_from_user(), which do not check it either, so a subsequent used ring update or descriptor fetch accesses memory outside the region the IOTLB actually maps. Reset the metadata cache whenever the vring is reconfigured, so the new addresses are pushed back through iotlb_access_ok()'s slow path.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00409 35th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.265, 5.15.216, 6.1.183 +5Red Hat: 14 advisoriesRed Hat: 41 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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

VendorProductAffected versionsFixed inStatusSource
LinuxLinux4.11 and later5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2Patch availableCNA
  • Linux VendorLinux Affected 4.11 and later Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2

Red Hat 14 advisories

  • RHSA-2026:81349 Released 2026-10-12 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.167.1.el7, kernel-3.10.0-1160.167.1.el7, kernel-abi-whitelists-3.10.0-1160.167.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.167.1.el7, kernel-tools-libs-devel-3.10.0-1160.167.1.el7
  • RHSA-2026:81371 Released 2026-10-12 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.167.1.rt56.1319.el7, kernel-rt-debug-3.10.0-1160.167.1.rt56.1319.el7, kernel-rt-debug-devel-3.10.0-1160.167.1.rt56.1319.el7 +4
  • RHSA-2026:65710 Released 2026-09-09 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.206.1.el8_4, kernel-4.18.0-305.206.1.el8_4, kernel-abi-stablelists-4.18.0-305.206.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.206.1.el8_4, kernel-4.18.0-305.206.1.el8_4, kernel-abi-stablelists-4.18.0-305.206.1.el8_4 +14
Show 11 more Red Hat advisories
  • RHSA-2026:62568 Released 2026-09-02 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.138.1.el9_6, libperf-5.14.0-570.138.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.138.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.138.1.el9_6, kernel-64k-devel-5.14.0-570.138.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.138.1.el9_6, kernel-64k-5.14.0-570.138.1.el9_6, kernel-64k-core-5.14.0-570.138.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.138.1.el9_6, kernel-rt-64k-5.14.0-570.138.1.el9_6, kernel-rt-64k-core-5.14.0-570.138.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.138.1.el9_6, kernel-rt-core-5.14.0-570.138.1.el9_6, kernel-rt-debug-5.14.0-570.138.1.el9_6 +11
  • RHSA-2026:61351 Released 2026-08-31 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.99.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.99.1.el10_0, kernel-64k-devel-6.12.0-55.99.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.99.1.el10_0, kernel-64k-6.12.0-55.99.1.el10_0, kernel-64k-core-6.12.0-55.99.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.99.1.el10_0, libperf-6.12.0-55.99.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.99.1.el10_0, kernel-rt-64k-6.12.0-55.99.1.el10_0, kernel-rt-64k-core-6.12.0-55.99.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.99.1.el10_0, kernel-rt-core-6.12.0-55.99.1.el10_0, kernel-rt-debug-6.12.0-55.99.1.el10_0 +11
  • RHSA-2026:61256 Released 2026-08-31 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.161.1.el8_8, kernel-4.18.0-477.161.1.el8_8, kernel-abi-stablelists-4.18.0-477.161.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.161.1.el8_8, kernel-4.18.0-477.161.1.el8_8, kernel-abi-stablelists-4.18.0-477.161.1.el8_8 +14
  • RHSA-2026:59662 Released 2026-08-26 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.188.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.188.1.el9_2, kernel-64k-devel-5.14.0-284.188.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.188.1.el9_2, kernel-5.14.0-284.188.1.el9_2, kernel-64k-5.14.0-284.188.1.el9_2 +29
  • RHSA-2026:59663 Released 2026-08-26 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-core-5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-debug-5.14.0-284.188.1.rt14.473.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-core-5.14.0-284.188.1.rt14.473.el9_2, kernel-rt-debug-5.14.0-284.188.1.rt14.473.el9_2 +11
  • RHSA-2026:59544 Released 2026-08-25 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.146.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.146.1.el9_4, kernel-64k-devel-5.14.0-427.146.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.146.1.el9_4, kernel-5.14.0-427.146.1.el9_4, kernel-64k-5.14.0-427.146.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.146.1.el9_4, kernel-rt-core-5.14.0-427.146.1.el9_4, kernel-rt-debug-5.14.0-427.146.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.146.1.el9_4, kernel-rt-core-5.14.0-427.146.1.el9_4, kernel-rt-debug-5.14.0-427.146.1.el9_4 +11
  • RHSA-2026:59473 Released 2026-08-25 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.208.1.el8_6, kernel-4.18.0-372.208.1.el8_6, kernel-abi-stablelists-4.18.0-372.208.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.208.1.el8_6, kernel-4.18.0-372.208.1.el8_6, kernel-abi-stablelists-4.18.0-372.208.1.el8_6 +14
  • RHSA-2026:57252 Released 2026-08-20 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.41.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.41.1.el9_8, kernel-64k-devel-5.14.0-687.41.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.41.1.el9_8, kernel-64k-5.14.0-687.41.1.el9_8, kernel-64k-core-5.14.0-687.41.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.41.1.el9_8, libperf-5.14.0-687.41.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.41.1.el9_8, kernel-rt-64k-5.14.0-687.41.1.el9_8, kernel-rt-64k-core-5.14.0-687.41.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.41.1.el9_8, kernel-rt-core-5.14.0-687.41.1.el9_8, kernel-rt-debug-5.14.0-687.41.1.el9_8 +9
  • RHSA-2026:57251 Released 2026-08-20 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.49.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.49.1.el10_2, kernel-64k-devel-6.12.0-211.49.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.49.1.el10_2, kernel-64k-6.12.0-211.49.1.el10_2, kernel-64k-core-6.12.0-211.49.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.49.1.el10_2, libperf-6.12.0-211.49.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.49.1.el10_2, kernel-rt-64k-6.12.0-211.49.1.el10_2, kernel-rt-64k-core-6.12.0-211.49.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.49.1.el10_2, kernel-rt-core-6.12.0-211.49.1.el10_2, kernel-rt-debug-6.12.0-211.49.1.el10_2 +9
  • RHSA-2026:55764 Released 2026-08-17 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.156.1.el8_10, kernel-4.18.0-553.156.1.el8_10, kernel-abi-stablelists-4.18.0-553.156.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.156.1.el8_10
  • RHSA-2026:55765 Released 2026-08-17 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-core-4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-4.18.0-553.156.1.rt7.497.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-core-4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-4.18.0-553.156.1.rt7.497.el8_10 +7

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:62568
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:59662
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:59544
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:61351
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:62568
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:55764
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:65710
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:59473
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:61256
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:59662
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:59544
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:61351
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:62568
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:65710
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:59473
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:61256
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:55764
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:61351
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:55765
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:55765
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:59663
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:59544
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:61351
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:62568
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:57251
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:57252
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:59663
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:59544
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:61351
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:62568
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:81349
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:81349
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:81371

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-74580
  2. 2026-10-03 Alias added: GHSA-mr6w-hqp3-cg59
  3. 2026-10-12 Fix available: RHSA-2026:81371 · Red Hat
  4. 2026-10-13 Fix available: RHSA-2026:81349 · Red Hat
  5. 2026-10-13 Fix available: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS), Red Hat Enterprise Linux for Real Time (v. 7 ELS) · Red Hat
  6. 2026-10-14 Fix available: RHSA-2026:55764 · Red Hat
  7. 2026-10-14 Fix available: RHSA-2026:55765 · Red Hat
  8. 2026-10-14 Fix available: RHSA-2026:57251 · Red Hat
  9. 2026-10-14 Fix available: RHSA-2026:57252 · Red Hat
  10. 2026-10-14 Fix available: RHSA-2026:59473 · Red Hat
  11. 2026-10-14 Fix available: RHSA-2026:59544 · Red Hat
  12. 2026-10-14 Fix available: RHSA-2026:61256 · Red Hat
  13. 2026-10-14 Fix available: RHSA-2026:59662 · Red Hat
  14. 2026-10-14 Fix available: RHSA-2026:65710 · Red Hat
  15. 2026-10-14 Fix available: RHSA-2026:59663 · Red Hat
  16. 2026-10-14 Fix available: RHSA-2026:61351 · Red Hat
  17. 2026-10-16 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux AppStream E4S (v.9.2) +30 · Red Hat
  18. 2026-10-16 CVSS score changed · Red Hat
  19. 2026-10-18 CISA SSVC decision points changed
  20. 2026-10-25 Priority changed: LOW → MEDIUM
  21. 2026-10-28 CISA SSVC decision points changed
  22. 2026-10-28 Priority changed: MEDIUM → HIGH
  23. 2026-10-29 CISA SSVC decision points changed

References

Other 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences