CVE-2026-99138tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO) do_tcp_getsockopt() reads icsk->icsk_ca_ops and dereferences the get_info function pointer without rcu_read_lock(). With BPF struct_ops congestion control, ca_ops can point to dynamically allocated memory that is freed concurrently, resulting in a use-after-free when the kernel dereferences or calls through the stale pointer. BUG: KASAN: slab-use-after-free in do_tcp_getsockopt+0x2037/0x23e0 Read of size 8 at addr ffff888013701258 by task exploit/149 do_tcp_getsockopt+0x2037/0x23e0 (net/ipv4/tcp.c:4564) tcp_getsockopt+0x91/0xf0 __sys_getsockopt+0xf7/0x170 Fix this by wrapping the ca_ops load and get_info call within rcu_read_lock()/rcu_read_unlock(), and using READ_ONCE() to load the icsk_ca_ops pointer.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 2 days later
· 2 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < 7c312f17917455eedcea29735fa302ebb93cb9b9
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < 66b831b427301a9c3e485564009d476631413103
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < a8b024cbf62b497062c86995737fc303e4cc384e
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < 8d5fc9e6dc09174d0da6e59678eb8e01a890cbd3
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < e057d201640eebb8ed47ec924872c41570a3bd28
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < 86814e5370068ec2bf0caa6e6d55c3e5bfc6c324
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < 39aa489e85752f9de214edb0f85e4d578e57af29
- affected 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 – < 385e474086c2e7e29e2dded690be40dc273e20ee
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.161 – ≤ 6.6.*
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.59 – ≤ 6.18.*
- unaffected 7.2.13 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/7c312f17917455eedcea29735fa302ebb93cb9b9 (opens in a new tab)
- https://git.kernel.org/stable/c/66b831b427301a9c3e485564009d476631413103 (opens in a new tab)
- https://git.kernel.org/stable/c/a8b024cbf62b497062c86995737fc303e4cc384e (opens in a new tab)
- https://git.kernel.org/stable/c/8d5fc9e6dc09174d0da6e59678eb8e01a890cbd3 (opens in a new tab)
- https://git.kernel.org/stable/c/e057d201640eebb8ed47ec924872c41570a3bd28 (opens in a new tab)
- https://git.kernel.org/stable/c/86814e5370068ec2bf0caa6e6d55c3e5bfc6c324 (opens in a new tab)
- https://git.kernel.org/stable/c/39aa489e85752f9de214edb0f85e4d578e57af29 (opens in a new tab)
- https://git.kernel.org/stable/c/385e474086c2e7e29e2dded690be40dc273e20ee (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-111890 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-99138)Record last updated .