CVE-2020-29661: broadcom fabric_operating_system Use After Free
Modified
AliasesRHSA-2021:0940RHSA-2021:1031UBUNTU-CVE-2020-29661DEBIAN-CVE-2020-29661
Published 09-12-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-29661 is a high (CVSS 7.8) Use After Free vulnerability in broadcom fabric_operating_system. EPSS estimates a 1.12% chance of exploitation in the next 30 days, higher than 66.2% of scored vulnerabilities.
Priority
Routine
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?CVSS score
7.8/10
010
High · v3.1 (NVD)EPSS score
1.12%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 51 · Related 30DLA-2557-1DLA-2586-1DSA-4843-1LSN-0082-1MGASA-2021-0030MGASA-2021-0031OPENSUSE-SU-2021:0060-1OPENSUSE-SU-2021:0075-1OPENSUSE-SU-2021:0242-1OPENSUSE-SU-2024:10728-1OPENSUSE-SU-2024:13704-1RHSA-2021:0354RHSA-2021:0537RHSA-2021:0558RHSA-2021:0686RHSA-2021:0689RHSA-2021:0763RHSA-2021:0765RHSA-2021:0774RHSA-2021:0856RHSA-2021:0857RHSA-2021:0862RHSA-2021:0878RHSA-2021:1028RHSA-2021:1288RHSA-2021:2164SUSE-RU-2021:14663-1SUSE-SU-2021:0094-1SUSE-SU-2021:0095-1SUSE-SU-2021:0096-1SUSE-SU-2021:0097-1SUSE-SU-2021:0098-1SUSE-SU-2021:0108-1SUSE-SU-2021:0117-1SUSE-SU-2021:0118-1SUSE-SU-2021:0133-1SUSE-SU-2021:0362-1SUSE-SU-2021:0367-1SUSE-SU-2021:0377-1SUSE-SU-2021:0408-1SUSE-SU-2021:0434-1SUSE-SU-2021:0437-1SUSE-SU-2021:0438-1SUSE-SU-2021:0452-1SUSE-SU-2021:14630-1USN-4748-1USN-4749-1USN-4750-1USN-4751-1USN-4752-1USN-5130-1
Timeline
- 09-12-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.8Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · Red hatEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
High 7.2Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
1.12%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.12% on 04-10-2026
04-10-202603-11-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
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.
- CWE-667Improper LockingThe product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
Affected systems
Version check
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu47 products
- linux< 3.13.0-188.239 | < 4.4.0-203.235 | < 4.15.0-136.140 | < 5.4.0-66.74
- linux-aws< 4.4.0-1086.90 | < 4.4.0-1122.136 | < 4.15.0-1094.101 | < 5.4.0-1038.40
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.4< 5.4.0-1038.40~18.04.1
Redhat40 products
- kpatch-patch-3_10_0-1062_21_1< 0:1-3.el7
- kpatch-patch-3_10_0-1062_21_1-debuginfo< 0:1-3.el7
- kpatch-patch-3_10_0-1062_26_1< 0:1-1.el7
- kpatch-patch-3_10_0-1062_26_1-debuginfo< 0:1-1.el7
- kpatch-patch-3_10_0-1062_30_1< 0:1-1.el7
Netapp7 products
Debian2 products
- linux< 5.9.15-1
- debian_linuxEOL9.0 | 10.0
Broadcom1 product
Fedoraproject1 product
- fedoraEOL32 | 33
Linux1 product
- linux_kernel≥ 2.6.26, < 4.4.248 | ≥ 4.5, < 4.9.248 | ≥ 4.10, < 4.14.212 | ≥ 4.15, < 4.19.163 | ≥ 4.20, < 5.4.83 | ≥ 5.5, < 5.9.14
Oracle1 product
- tekelec_platform_distribution≥ 7.4.0, ≤ 7.7.1
8 vendors · 100 products
References
30 links- www.openwall.com/lists/oss-security/2020/12/10/1Mailing ListX Refsource MLISTPatchThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/02/msg00018.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing ListX Refsource MLISTThird Party Advisory
- packetstormsecurity.com/files/160681/Linux-TIOCSPGRP-Broken-Locking.htmlX Refsource MISCThird Party AdvisoryVDB Entry
Show all 30 references
- packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.htmlX Refsource MISCThird Party AdvisoryVDB Entry
