CVE-2021-3347: debian debian_linux Use After Free

Modified

AliasesMGASA-2021-0062RHSA-2021:2285UBUNTU-CVE-2021-3347+1 more

Published 29-01-2021Last modified 25-02-2026

Vulnerability summary

CVE-2021-3347 is a high (CVSS 7.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 1.36% chance of exploitation in the next 30 days, higher than 71.8% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?

CVSS score

7.8/10

010

High · v3.1 (CVE.org)

EPSS score

1.36%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 51 · Related 29

Timeline

29-01-2021
PublishedVulnerability first disclosed.
25-02-2026
Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 5 sources · 2 versions

v3.17.8v2.07.2

EPSS trend

Probability

1.36%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.36% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found

referenceUnverified
Exploit Reference (openwall.com)
Maturity: unknown

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu49 products

linuxAll versions (No fix recorded) | < 4.4.0-208.240 | < 4.15.0-141.145 | < 5.4.0-67.75
linux-aws< 4.4.0-1090.94 | < 4.4.0-1126.140 | < 4.15.0-1098.105 | < 5.4.0-1039.41
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1039.41~18.04.1

linux-aws-fips< 4.15.0-2041.43 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1098.105~16.04.1
linux-azure< 4.15.0-1112.124~14.04.1 | < 4.15.0-1112.124~16.04.1 | All versions (No fix recorded) | < 5.4.0-1041.43
linux-azure-4.15< 4.15.0-1112.125
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1041.43~18.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde-5.15< 5.15.0-1114.123~20.04.1
linux-azure-fips< 4.15.0-2024.27 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-dell300x< 4.15.0-1016.20
linux-fips< 4.4.0-1060.66 | All versions (No fix recorded) | < 4.15.0-1057.65
linux-gcp< 4.15.0-1097.110~16.04.1 | All versions (No fix recorded) | < 5.4.0-1038.41
linux-gcp-4.15< 4.15.0-1097.110
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1038.41~18.04.1
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fipsAll versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1037.39
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1037.39~18.04.1
linux-gkeop< 5.4.0-1011.12
linux-gkeop-5.4< 5.4.0-1011.12~18.04.2
linux-hwe< 4.15.0-142.146~16.04.1 | All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-67.75~18.04.1
linux-hwe-5.8< 5.8.0-49.55~20.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1091.100 | < 4.15.0-1089.91 | < 5.4.0-1034.35
linux-lts-xenial< 4.4.0-208.240~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1017.18
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1069.77~16.04.1 | < 4.15.0-1069.77 | < 5.4.0-1039.42
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1039.42~18.04.1
linux-raspi< 5.4.0-1030.33
linux-raspi-5.4< 5.4.0-1030.33~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1083.88 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.8< 5.8.0-22.24~20.04.1
linux-snapdragon< 4.15.0-1100.109

Show all 49

Redhat18 products

kpatch-patch-3_10_0-1160< 0:1-6.el7
kpatch-patch-3_10_0-1160_11_1< 0:1-5.el7
kpatch-patch-3_10_0-1160_11_1-debuginfo< 0:1-5.el7
kpatch-patch-3_10_0-1160_15_2< 0:1-5.el7
kpatch-patch-3_10_0-1160_15_2-debuginfo< 0:1-5.el7

Show all 18

Debian2 products

linux< 5.10.12-1
debian_linuxEOL9.0 | 10.0

Fedoraproject1 product

fedoraEOL32 | 33

Linux1 product

linux_kernel≤ 5.10.11

Mageia1 product

kernel-linus< 5.10.12-1.mga7

6 vendors · 72 products

References

35 links

git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
www.openwall.com/lists/oss-security/2021/01/29/3X Refsource MISCMailing ListThird Party Advisory
www.openwall.com/lists/oss-security/2021/01/29/1X Refsource MISCREPORTMailing ListThird Party Advisory

Show all 35 references

www.openwall.com/lists/oss-security/2021/01/29/5Mailing ListX Refsource MLISTThird Party Advisory
www.openwall.com/lists/oss-security/2021/01/29/4Mailing ListX Refsource MLISTThird Party Advisory
www.openwall.com/lists/oss-security/2021/02/01/4Mailing ListX Refsource MLISTExploitThird Party Advisory
www.debian.org/security/2021/dsa-4843Vendor AdvisoryX Refsource DEBIANThird Party Advisory
lists.fedoraproject.org/archives/…Vendor AdvisoryX Refsource FEDORA
lists.fedoraproject.org/archives/…Vendor AdvisoryX Refsource FEDORA
lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing ListX Refsource MLISTThird Party Advisory
security.netapp.com/advisory/ntap-20210304-0005/X Refsource CONFIRMThird Party Advisory
lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing ListX Refsource MLISTThird Party Advisory
advisories.mageia.org/MGASA-2021-0062.htmlAdvisory
bugs.mageia.org/show_bug.cgi?id=28262REPORT
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.12WEB
access.redhat.com/errata/RHSA-2021:2285Advisory
access.redhat.com/security/updates/classification/ARTICLE
bugzilla.redhat.com/show_bug.cgi?id=1922249REPORT
security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2285.jsonAdvisory
access.redhat.com/security/cve/CVE-2021-3347REPORT
www.cve.org/CVERecord?id=CVE-2021-3347AdvisoryREPORT
nvd.nist.gov/vuln/detail/CVE-2021-3347AdvisoryOval
ubuntu.com/security/CVE-2021-3347REPORT
ubuntu.com/security/notices/USN-4878-1Advisory
ubuntu.com/security/notices/USN-4884-1Advisory
ubuntu.com/security/notices/USN-4907-1Advisory
ubuntu.com/security/notices/USN-4910-1Advisory
security-tracker.debian.org/tracker/CVE-2021-3347Advisory