9.8
CRITICAL
CVSS 3.1
CVE-2026-74569
netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp()
Overview
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() sip_help_tcp() stores the size change of each NAT-rewritten SIP message in s16 diff and accumulates it in s16 tdiff, but a single message can grow by more than S16_MAX while the packet stays under the 65535 enlarge_skb() limit: nf_nat_sip() rewrites every matching URI, and a long Contact list expands the message by tens of kilobytes. diff then wraps, and "datalen = datalen + diff - msglen" yields a huge unsigned datalen, so the next iteration's ct_sip_get_header() reads past the linearized skb tail. Widen diff, tdiff and the seq_adjust hook to s32. Both are bounded by the 65535 byte packet limit, and the seqadj core is already s32 (nf_ct_seqadj_set() takes s32), so no previously accepted input is rejected. BUG: KASAN: use-after-free in ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464) Read of size 1 at addr ffff888010800000 by task ksoftirqd/1/25 ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464) sip_help_tcp (net/netfilter/nf_conntrack_sip.c:1694) nf_confirm (net/netfilter/nf_conntrack_proto.c:183) nf_hook_slow (net/netfilter/core.c:619) ip6_output (net/ipv6/ip6_output.c:246) ip6_forward (net/ipv6/ip6_output.c:690) ipv6_rcv (net/ipv6/ip6_input.c:351) __netif_receive_skb_one_core (net/core/dev.c:6212) process_backlog (net/core/dev.c:6676) __napi_poll (net/core/dev.c:7735) net_rx_action (net/core/dev.c:7955) handle_softirqs (kernel/softirq.c:622) run_ksoftirqd (kernel/softirq.c:1076) ...
Details
INFO
Published Date :
Aug. 15, 2026, 1:18 p.m.
Last Modified :
Aug. 19, 2026, 5:21 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Update the Linux kernel to resolve an integer overflow issue in SIP processing.
- Update the Linux kernel to the latest version.
- Apply relevant security patches for netfilter.
- Reboot systems after updating.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74569.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74569 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74569
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74569 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74569 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 19, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/1b0843f9e9b9b0b9b4b70d143b67e58163c85b2c Added Reference https://git.kernel.org/stable/c/32d4abc8923b0d4046fd63ad6e4917872e44eb6d Added Reference https://git.kernel.org/stable/c/ed1f9be6dc8e2e280b8725e44ccdc6e0cd38640d Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': '63eea41759fd682229c14e0a2205802b46d106f3', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'c97621a110e386b2dd69e276eb699e1d3cec581d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'f74554e67ccf04d1fa71069e8c9afa2717e40716', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5', 'versionType': 'git'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'ed1f9be6dc8e2e280b8725e44ccdc6e0cd38640d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': '1b0843f9e9b9b0b9b4b70d143b67e58163c85b2c', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': '32d4abc8923b0d4046fd63ad6e4917872e44eb6d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': '63eea41759fd682229c14e0a2205802b46d106f3', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'c97621a110e386b2dd69e276eb699e1d3cec581d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'f74554e67ccf04d1fa71069e8c9afa2717e40716', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5', 'versionType': 'git'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.265', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.216', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': '63eea41759fd682229c14e0a2205802b46d106f3', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'c97621a110e386b2dd69e276eb699e1d3cec581d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'f74554e67ccf04d1fa71069e8c9afa2717e40716', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5', 'versionType': 'git'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': '63eea41759fd682229c14e0a2205802b46d106f3', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'c97621a110e386b2dd69e276eb699e1d3cec581d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'f74554e67ccf04d1fa71069e8c9afa2717e40716', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5', 'versionType': 'git'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': '63eea41759fd682229c14e0a2205802b46d106f3', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'c97621a110e386b2dd69e276eb699e1d3cec581d', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'f74554e67ccf04d1fa71069e8c9afa2717e40716', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64', 'versionType': 'git'}, {'status': 'affected', 'version': 'f5b321bd37fbec9188feb1f721ab46a5ac0b35da', 'lessThan': 'db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5', 'versionType': 'git'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.34'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.34', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/linux/netfilter/nf_conntrack_sip.h', 'net/netfilter/nf_conntrack_sip.c', 'net/netfilter/nf_nat_sip.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() sip_help_tcp() stores the size change of each NAT-rewritten SIP message in s16 diff and accumulates it in s16 tdiff, but a single message can grow by more than S16_MAX while the packet stays under the 65535 enlarge_skb() limit: nf_nat_sip() rewrites every matching URI, and a long Contact list expands the message by tens of kilobytes. diff then wraps, and "datalen = datalen + diff - msglen" yields a huge unsigned datalen, so the next iteration's ct_sip_get_header() reads past the linearized skb tail. Widen diff, tdiff and the seq_adjust hook to s32. Both are bounded by the 65535 byte packet limit, and the seqadj core is already s32 (nf_ct_seqadj_set() takes s32), so no previously accepted input is rejected. BUG: KASAN: use-after-free in ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464) Read of size 1 at addr ffff888010800000 by task ksoftirqd/1/25 ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464) sip_help_tcp (net/netfilter/nf_conntrack_sip.c:1694) nf_confirm (net/netfilter/nf_conntrack_proto.c:183) nf_hook_slow (net/netfilter/core.c:619) ip6_output (net/ipv6/ip6_output.c:246) ip6_forward (net/ipv6/ip6_output.c:690) ipv6_rcv (net/ipv6/ip6_input.c:351) __netif_receive_skb_one_core (net/core/dev.c:6212) process_backlog (net/core/dev.c:6676) __napi_poll (net/core/dev.c:7735) net_rx_action (net/core/dev.c:7955) handle_softirqs (kernel/softirq.c:622) run_ksoftirqd (kernel/softirq.c:1076) ... Added Reference https://git.kernel.org/stable/c/63eea41759fd682229c14e0a2205802b46d106f3 Added Reference https://git.kernel.org/stable/c/c97621a110e386b2dd69e276eb699e1d3cec581d Added Reference https://git.kernel.org/stable/c/db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5 Added Reference https://git.kernel.org/stable/c/ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64 Added Reference https://git.kernel.org/stable/c/f74554e67ccf04d1fa71069e8c9afa2717e40716
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.