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TI-2021-02345 Aliases CVE-2021-3347GHSA-8r42-h5pm-2vw2

An issue was discovered in the Linux kernel through 5.10.11.

Priority HIGH 69CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01365 71st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 19 advisories

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
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*up to 5.10.11VulnerableLinux
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*32VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions up to 5.10.11 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject

Remediation

Red Hat 19 advisories

  • RHSA-2021:3523 Released 2021-09-14 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server E4S (v. 7.7) kpatch-patch-3_10_0-1062_36_1-1-5.el7, kpatch-patch-3_10_0-1062_37_1-1-5.el7, kpatch-patch-3_10_0-1062_40_1-1-5.el7 +6
  • RHSA-2021:3522 Released 2021-09-14 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +9
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debug-devel-3.10.0-1062.56.1.el7, kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +8
  • RHSA-2021:3399 Released 2021-08-31 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.2) kernel-3.10.0-327.100.1.el7, kernel-abi-whitelists-3.10.0-327.100.1.el7, kernel-debug-3.10.0-327.100.1.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.2) kernel-tools-libs-devel-3.10.0-327.100.1.el7
Show 16 more Red Hat advisories
  • RHSA-2021:2731 Released 2021-07-21 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server E4S (v. 7.6) kpatch-patch-3_10_0-957_58_2-1-4.el7, kpatch-patch-3_10_0-957_61_1-1-4.el7, kpatch-patch-3_10_0-957_61_2-1-4.el7 +6
  • RHSA-2021:2730 Released 2021-07-20 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.6) bpftool-3.10.0-957.78.2.el7, kernel-3.10.0-957.78.2.el7, kernel-abi-whitelists-3.10.0-957.78.2.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.6) kernel-3.10.0-957.78.2.el7, kernel-abi-whitelists-3.10.0-957.78.2.el7, kernel-bootwrapper-3.10.0-957.78.2.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.78.2.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debug-devel-3.10.0-957.78.2.el7, kernel-tools-libs-devel-3.10.0-957.78.2.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.78.2.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.6) bpftool-3.10.0-957.78.2.el7, kernel-3.10.0-957.78.2.el7, kernel-abi-whitelists-3.10.0-957.78.2.el7 +8
  • RHSA-2021:2732 Released 2021-07-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 7.4) kernel-3.10.0-693.90.2.el7, kernel-abi-whitelists-3.10.0-693.90.2.el7, kernel-debug-3.10.0-693.90.2.el7 +7
    • Red Hat Enterprise Linux Server E4S (v. 7.4) kernel-3.10.0-693.90.2.el7, kernel-abi-whitelists-3.10.0-693.90.2.el7, kernel-bootwrapper-3.10.0-693.90.2.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.90.2.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.4) kernel-debug-devel-3.10.0-693.90.2.el7, kernel-tools-libs-devel-3.10.0-693.90.2.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.4) kernel-tools-libs-devel-3.10.0-693.90.2.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.4) kernel-3.10.0-693.90.2.el7, kernel-abi-whitelists-3.10.0-693.90.2.el7, kernel-debug-3.10.0-693.90.2.el7 +7
  • RHSA-2021:2735 Released 2021-07-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server (v. 6 ELS) kernel-2.6.32-754.41.2.el6, kernel-abi-whitelists-2.6.32-754.41.2.el6, kernel-debug-2.6.32-754.41.2.el6 +7
    • Red Hat Enterprise Linux Server Optional (v. 6 ELS) python-perf-2.6.32-754.41.2.el6
  • RHSA-2021:2733 Released 2021-07-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 7.3) kernel-3.10.0-514.90.2.el7, kernel-abi-whitelists-3.10.0-514.90.2.el7, kernel-debug-3.10.0-514.90.2.el7 +7
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-tools-libs-devel-3.10.0-514.90.2.el7
  • RHSA-2021:2314 Released 2021-06-08 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.31.1.el7, kernel-3.10.0-1160.31.1.el7, kernel-abi-whitelists-3.10.0-1160.31.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.31.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.31.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.31.1.el7, kernel-3.10.0-1160.31.1.el7, kernel-abi-whitelists-3.10.0-1160.31.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.31.1.el7, kernel-tools-libs-devel-3.10.0-1160.31.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.31.1.el7, kernel-3.10.0-1160.31.1.el7, kernel-abi-whitelists-3.10.0-1160.31.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.31.1.el7
  • RHSA-2021:2316 Released 2021-06-08 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-devel-3.10.0-1160.31.1.rt56.1169.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-devel-3.10.0-1160.31.1.rt56.1169.el7 +7
  • RHSA-2021:2285 Released 2021-06-08 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server (v. 7) kpatch-patch-3_10_0-1160-1-6.el7, kpatch-patch-3_10_0-1160_11_1-1-5.el7, kpatch-patch-3_10_0-1160_15_2-1-5.el7 +6
  • RHSA-2021:2106 Released 2021-05-25 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-tools-libs-devel-4.18.0-147.48.1.el8_1
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) bpftool-4.18.0-147.48.1.el8_1, kernel-4.18.0-147.48.1.el8_1, kernel-abi-whitelists-4.18.0-147.48.1.el8_1 +19
  • RHSA-2021:2099 Released 2021-05-25 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) kpatch-patch-4_18_0-147_20_1-1-11.el8_1, kpatch-patch-4_18_0-147_24_2-1-9.el8_1, kpatch-patch-4_18_0-147_27_1-1-9.el8_1 +5
  • RHSA-2021:1379 Released 2021-04-27 · Red Hat rating Important
    kernel-alt security and bug fix update
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) kernel-4.14.0-115.36.1.el7a, kernel-alt-4.14.0-115.36.1.el7a, kernel-bootwrapper-4.14.0-115.36.1.el7a +6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debug-devel-4.14.0-115.36.1.el7a, kernel-tools-libs-devel-4.14.0-115.36.1.el7a
  • RHSA-2021:1295 Released 2021-04-20 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) kpatch-patch-4_18_0-193-1-13.el8, kpatch-patch-4_18_0-193_13_2-1-8.el8_2, kpatch-patch-4_18_0-193_14_3-1-8.el8_2 +10
  • RHSA-2021:1272 Released 2021-04-20 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-tools-libs-devel-4.18.0-193.51.1.el8_2
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) bpftool-4.18.0-193.51.1.el8_2, kernel-4.18.0-193.51.1.el8_2, kernel-abi-whitelists-4.18.0-193.51.1.el8_2 +19
  • RHSA-2021:1279 Released 2021-04-20 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-core-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-debug-4.18.0-193.51.1.rt13.101.el8_2 +7
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-core-4.18.0-193.51.1.rt13.101.el8_2, kernel-rt-debug-4.18.0-193.51.1.rt13.101.el8_2 +9
  • RHSA-2021:1093 Released 2021-04-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-240.22.1.el8_3
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-240.22.1.el8_3, kernel-4.18.0-240.22.1.el8_3, kernel-abi-whitelists-4.18.0-240.22.1.el8_3 +19
  • RHSA-2021:1081 Released 2021-04-06 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:1093
Red Hat CodeReady Linux Builder EUS (v. 8.1)Fixed RHSA-2021:2106
Red Hat CodeReady Linux Builder EUS (v. 8.2)Fixed RHSA-2021:1272
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:1093
Red Hat Enterprise Linux BaseOS EUS (v. 8.1)Fixed RHSA-2021:2099, RHSA-2021:2106
Red Hat Enterprise Linux BaseOS EUS (v. 8.2)Fixed RHSA-2021:1272, RHSA-2021:1295
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2021:1081
Red Hat Enterprise Linux Real Time EUS (v. 8.2)Fixed RHSA-2021:1279
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2021:1081
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2)Fixed RHSA-2021:1279
Red Hat Enterprise Linux Server (v. 6 ELS)Fixed RHSA-2021:2735
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:2285, RHSA-2021:2314
Red Hat Enterprise Linux Server AUS (v. 7.2)Fixed RHSA-2021:3399
Red Hat Enterprise Linux Server AUS (v. 7.3)Fixed RHSA-2021:2733
Red Hat Enterprise Linux Server AUS (v. 7.4)Fixed RHSA-2021:2732
Red Hat Enterprise Linux Server AUS (v. 7.6)Fixed RHSA-2021:2730
Red Hat Enterprise Linux Server AUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server E4S (v. 7.4)Fixed RHSA-2021:2732
Red Hat Enterprise Linux Server E4S (v. 7.6)Fixed RHSA-2021:2730, RHSA-2021:2731
Red Hat Enterprise Linux Server E4S (v. 7.7)Fixed RHSA-2021:3522, RHSA-2021:3523
Red Hat Enterprise Linux Server Optional (v. 6 ELS)Fixed RHSA-2021:2735
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Server Optional AUS (v. 7.2)Fixed RHSA-2021:3399
Red Hat Enterprise Linux Server Optional AUS (v. 7.3)Fixed RHSA-2021:2733
Red Hat Enterprise Linux Server Optional AUS (v. 7.4)Fixed RHSA-2021:2732
Red Hat Enterprise Linux Server Optional AUS (v. 7.6)Fixed RHSA-2021:2730
Red Hat Enterprise Linux Server Optional AUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server Optional E4S (v. 7.4)Fixed RHSA-2021:2732
Red Hat Enterprise Linux Server Optional E4S (v. 7.6)Fixed RHSA-2021:2730
Red Hat Enterprise Linux Server Optional E4S (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server Optional TUS (v. 7.4)Fixed RHSA-2021:2732
Red Hat Enterprise Linux Server Optional TUS (v. 7.6)Fixed RHSA-2021:2730
Red Hat Enterprise Linux Server Optional TUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server TUS (v. 7.4)Fixed RHSA-2021:2732
Red Hat Enterprise Linux Server TUS (v. 7.6)Fixed RHSA-2021:2730
Red Hat Enterprise Linux Server TUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2021:1379
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2021:1379
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2021:2316
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2021:2316
Not affected: 2 products
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3347
  2. 2026-10-03 Alias added: GHSA-8r42-h5pm-2vw2

References

Exploit 1

Patch 8

Advisory 10

Sources

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