The tcp_sacktag_write_queue function in net/ipv4/tcp_input.c in Linux kernel 2.6.21…
Priority MEDIUM 41CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Complete
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
The tcp_sacktag_write_queue function in net/ipv4/tcp_input.c in Linux kernel 2.6.21 through 2.6.23.7, and 2.6.24-rc through 2.6.24-rc2, allows remote attackers to cause a denial of service (crash) via crafted ACK responses that trigger a NULL pointer dereference.
Why it matters now
EPSS 0.03822 90th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 64
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:2.6.21:*:*:*:*:*:*:* | 2.6.21 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21:rc1:*:*:*:*:*:* | 2.6.21 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21:rc2:*:*:*:*:*:* | 2.6.21 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21:rc3:*:*:*:*:*:* | 2.6.21 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21:rc4:*:*:*:*:*:* | 2.6.21 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21:rc5:*:*:*:*:*:* | 2.6.21 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21:rc6:*:*:*:*:*:* | 2.6.21 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21:rc7:*:*:*:*:*:* | 2.6.21 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21.1:*:*:*:*:*:*:* | 2.6.21.1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21.2:*:*:*:*:*:*:* | 2.6.21.2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:2.6.21:*:*:*:*:*:*:* Versions 2.6.21 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21:rc1:*:*:*:*:*:* Versions 2.6.21 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21:rc2:*:*:*:*:*:* Versions 2.6.21 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21:rc3:*:*:*:*:*:* Versions 2.6.21 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21:rc4:*:*:*:*:*:* Versions 2.6.21 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21:rc5:*:*:*:*:*:* Versions 2.6.21 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21:rc6:*:*:*:*:*:* Versions 2.6.21 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21:rc7:*:*:*:*:*:* Versions 2.6.21 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21.1:*:*:*:*:*:*:* Versions 2.6.21.1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21.2:*:*:*:*:*:*:* Versions 2.6.21.2 Vulnerable ·Linux
Show 54 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:2.6.21.3:*:*:*:*:*:*:* | 2.6.21.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21.4:*:*:*:*:*:*:* | 2.6.21.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21.5:*:*:*:*:*:*:* | 2.6.21.5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21.6:*:*:*:*:*:*:* | 2.6.21.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.21.7:*:*:*:*:*:*:* | 2.6.21.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:*:*:*:*:*:*:* | 2.6.22 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:rc1:*:*:*:*:*:* | 2.6.22 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:rc2:*:*:*:*:*:* | 2.6.22 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:rc3:*:*:*:*:*:* | 2.6.22 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:rc4:*:*:*:*:*:* | 2.6.22 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:rc5:*:*:*:*:*:* | 2.6.22 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:rc6:*:*:*:*:*:* | 2.6.22 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22:rc7:*:*:*:*:*:* | 2.6.22 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.1:*:*:*:*:*:*:* | 2.6.22.1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.2:*:*:*:*:*:*:* | 2.6.22.2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.3:*:*:*:*:*:*:* | 2.6.22.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.4:*:*:*:*:*:*:* | 2.6.22.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.5:*:*:*:*:*:*:* | 2.6.22.5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.6:*:*:*:*:*:*:* | 2.6.22.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.7:*:*:*:*:*:*:* | 2.6.22.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.8:*:*:*:*:*:*:* | 2.6.22.8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.9:*:*:*:*:*:*:* | 2.6.22.9 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.10:*:*:*:*:*:*:* | 2.6.22.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.11:*:*:*:*:*:*:* | 2.6.22.11 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.12:*:*:*:*:*:*:* | 2.6.22.12 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.13:*:*:*:*:*:*:* | 2.6.22.13 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.14:*:*:*:*:*:*:* | 2.6.22.14 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.15:*:*:*:*:*:*:* | 2.6.22.15 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.16:*:*:*:*:*:*:* | 2.6.22.16 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.17:*:*:*:*:*:*:* | 2.6.22.17 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.18:*:*:*:*:*:*:* | 2.6.22.18 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.19:*:*:*:*:*:*:* | 2.6.22.19 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.20:*:*:*:*:*:*:* | 2.6.22.20 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.21:*:*:*:*:*:*:* | 2.6.22.21 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.22.22:*:*:*:*:*:*:* | 2.6.22.22 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:*:*:*:*:*:*:* | 2.6.23 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc1:*:*:*:*:*:* | 2.6.23 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc2:*:*:*:*:*:* | 2.6.23 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc3:*:*:*:*:*:* | 2.6.23 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc4:*:*:*:*:*:* | 2.6.23 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc5:*:*:*:*:*:* | 2.6.23 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc6:*:*:*:*:*:* | 2.6.23 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc7:*:*:*:*:*:* | 2.6.23 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc8:*:*:*:*:*:* | 2.6.23 rc8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23:rc9:*:*:*:*:*:* | 2.6.23 rc9 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23.1:*:*:*:*:*:*:* | 2.6.23.1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23.2:*:*:*:*:*:*:* | 2.6.23.2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23.3:*:*:*:*:*:*:* | 2.6.23.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23.4:*:*:*:*:*:*:* | 2.6.23.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23.5:*:*:*:*:*:*:* | 2.6.23.5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23.6:*:*:*:*:*:*:* | 2.6.23.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.23.7:*:*:*:*:*:*:* | 2.6.23.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.24:rc1:*:*:*:*:*:* | 2.6.24 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:2.6.24:rc2:*:*:*:*:*:* | 2.6.24 rc2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:2.6.21.3:*:*:*:*:*:*:* Versions 2.6.21.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21.4:*:*:*:*:*:*:* Versions 2.6.21.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21.5:*:*:*:*:*:*:* Versions 2.6.21.5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21.6:*:*:*:*:*:*:* Versions 2.6.21.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.21.7:*:*:*:*:*:*:* Versions 2.6.21.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:*:*:*:*:*:*:* Versions 2.6.22 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:rc1:*:*:*:*:*:* Versions 2.6.22 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:rc2:*:*:*:*:*:* Versions 2.6.22 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:rc3:*:*:*:*:*:* Versions 2.6.22 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:rc4:*:*:*:*:*:* Versions 2.6.22 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:rc5:*:*:*:*:*:* Versions 2.6.22 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:rc6:*:*:*:*:*:* Versions 2.6.22 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22:rc7:*:*:*:*:*:* Versions 2.6.22 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.1:*:*:*:*:*:*:* Versions 2.6.22.1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.2:*:*:*:*:*:*:* Versions 2.6.22.2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.3:*:*:*:*:*:*:* Versions 2.6.22.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.4:*:*:*:*:*:*:* Versions 2.6.22.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.5:*:*:*:*:*:*:* Versions 2.6.22.5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.6:*:*:*:*:*:*:* Versions 2.6.22.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.7:*:*:*:*:*:*:* Versions 2.6.22.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.8:*:*:*:*:*:*:* Versions 2.6.22.8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.9:*:*:*:*:*:*:* Versions 2.6.22.9 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.10:*:*:*:*:*:*:* Versions 2.6.22.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.11:*:*:*:*:*:*:* Versions 2.6.22.11 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.12:*:*:*:*:*:*:* Versions 2.6.22.12 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.13:*:*:*:*:*:*:* Versions 2.6.22.13 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.14:*:*:*:*:*:*:* Versions 2.6.22.14 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.15:*:*:*:*:*:*:* Versions 2.6.22.15 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.16:*:*:*:*:*:*:* Versions 2.6.22.16 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.17:*:*:*:*:*:*:* Versions 2.6.22.17 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.18:*:*:*:*:*:*:* Versions 2.6.22.18 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.19:*:*:*:*:*:*:* Versions 2.6.22.19 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.20:*:*:*:*:*:*:* Versions 2.6.22.20 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.21:*:*:*:*:*:*:* Versions 2.6.22.21 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.22.22:*:*:*:*:*:*:* Versions 2.6.22.22 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:*:*:*:*:*:*:* Versions 2.6.23 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc1:*:*:*:*:*:* Versions 2.6.23 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc2:*:*:*:*:*:* Versions 2.6.23 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc3:*:*:*:*:*:* Versions 2.6.23 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc4:*:*:*:*:*:* Versions 2.6.23 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc5:*:*:*:*:*:* Versions 2.6.23 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc6:*:*:*:*:*:* Versions 2.6.23 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc7:*:*:*:*:*:* Versions 2.6.23 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc8:*:*:*:*:*:* Versions 2.6.23 rc8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23:rc9:*:*:*:*:*:* Versions 2.6.23 rc9 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23.1:*:*:*:*:*:*:* Versions 2.6.23.1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23.2:*:*:*:*:*:*:* Versions 2.6.23.2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23.3:*:*:*:*:*:*:* Versions 2.6.23.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23.4:*:*:*:*:*:*:* Versions 2.6.23.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23.5:*:*:*:*:*:*:* Versions 2.6.23.5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23.6:*:*:*:*:*:*:* Versions 2.6.23.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.23.7:*:*:*:*:*:*:* Versions 2.6.23.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.24:rc1:*:*:*:*:*:* Versions 2.6.24 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:2.6.24:rc2:*:*:*:*:*:* Versions 2.6.24 rc2 Vulnerable ·Linux
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2007-5501
- 2026-10-03 Alias added: GHSA-r4cx-v58f-4gx6
- 2026-10-21 EPSS moved to the 90th–95th percentile
- 2026-10-25 EPSS moved to the 50th–90th percentile
- 2026-10-27 EPSS moved to the 90th–95th percentile
References
Advisory 10
More Linux Kernel vulnerabilities
- 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-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
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2007-5501 · CVE Program
- CVE-2007-5501 · NVD
- FIRST EPSS
- GHSA-r4cx-v58f-4gx6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences