Description
Use-after-free vulnerability in net/ipv4/tcp_input.c in the Linux kernel 2.6 before 2.6.20, when IPV6_RECVPKTINFO is set on a listening socket, allows remote attackers to cause a denial of service (kernel panic) via a SYN packet while the socket is in a listening (TCP_LISTEN) state, which is not properly handled and causes the skb structure to be freed.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +11 | 2.6.18-194.el5 | RHSA-2010:0178 |
| RHEL 4 | kernel +10 | 2.6.9-89.0.25.EL | RHSA-2010:0394 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5.4 EUS | kernel +11 | 2.6.18-164.17.1.el5 | RHSA-2010:0380 |
| RHEL 5.3 EUS | kernel +12 | 2.6.18-128.17.1.el5 | RHSA-2010:0439 |
| RHEL 4.7 EUS | kernel +10 | 2.6.9-78.0.31.EL | RHSA-2010:0424 |
| RHEL 3 ELS | kernel +8 | 2.4.21-66.EL | RHSA-2010:0882 |
Advisories 6
- RHSA-2010:0882 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2010:0380 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2010:0178 Red Hat Security Advisory: Red Hat Enterprise Linux 5.5 kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2010:0439 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2010:0424 Red Hat Security Advisory: kernel security and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2010:0394 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
References
- 1023992 vdb-entry
- RHSA-2010:0380 vendor-advisory
- oval:org.mitre.oval:def:9878 vdb-entry signature
- RHSA-2010:0394 vendor-advisory
- http://support.avaya.com/css/P8/documents/100090459
- RHSA-2010:0882 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20
- [oss-security] 20100329 CVE request: kernel: ipv6: skb is unexpectedly freed (remote DoS) mailing-list
- 39652 third-party-advisory
- http://www.vmware.com/security/advisories/VMSA-2011-0009.html
- http://git.kernel.org/linus/fb7e2399ec17f1004c0e0ccfd17439f8759ede01
- RHSA-2010:0439 vendor-advisory
- 39016 vdb-entry
- RHSA-2010:0424 vendor-advisory