CVE-2026-72392
ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump inet6_dump_fib() saves its progress in cb->args[1] as a positional index within the current hash chain. Between batches, a concurrent fib6_new_table() can insert a new table at the chain head, shifting all existing entries. The saved index then lands on a different table, causing fib6_dump_table() to set w->root to the wrong table while w->node still points into the previous one. fib6_walk_continue() dereferences w->node->parent (NULL) and panics: BUG: kernel NULL pointer dereference, address: 0000000000000008 RIP: 0010:fib6_walk_continue+0x6e/0x170 Call Trace: <TASK> fib6_dump_table.isra.0+0xc5/0x240 inet6_dump_fib+0xf6/0x420 rtnl_dumpit+0x30/0xa0 netlink_dump+0x15b/0x460 netlink_recvmsg+0x1d6/0x2a0 ____sys_recvmsg+0x17a/0x190 Fix by storing tb->tb6_id in cb->args[1] instead of a positional index. On resume, skip entries until the id matches; a concurrent head-insert can never match the saved id, so the walker always resumes on the correct table.
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 17, 2026, 6:19 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the patched version.
- Verify the patch is correctly applied.
- Monitor system stability.
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-2026-72392.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72392 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-2026-72392
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-2026-72392 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72392 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.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '89f9c5fee3c64c5cabc34e65599308fd3c879cf9', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '27210d433a8c5fe6bf7278a04bbaeb49a81d0290', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '059efb48dd746518898faaa9b965511009b59639', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': 'd8a01d27873e04bebd357dc87859aa756e0b28b2', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '110ccbd28c9444866fcc84ba96a2ad64fa6e95ae', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '9facb861dc6b9b9ea9793ef5032a9a826f7a4229', 'versionType': 'git'}], 'programFiles': ['net/ipv6/ip6_fib.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/ip6_fib.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '89f9c5fee3c64c5cabc34e65599308fd3c879cf9', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '27210d433a8c5fe6bf7278a04bbaeb49a81d0290', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '059efb48dd746518898faaa9b965511009b59639', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': 'd8a01d27873e04bebd357dc87859aa756e0b28b2', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '110ccbd28c9444866fcc84ba96a2ad64fa6e95ae', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '9facb861dc6b9b9ea9793ef5032a9a826f7a4229', 'versionType': 'git'}], 'programFiles': ['net/ipv6/ip6_fib.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/ip6_fib.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': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '89f9c5fee3c64c5cabc34e65599308fd3c879cf9', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '27210d433a8c5fe6bf7278a04bbaeb49a81d0290', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '059efb48dd746518898faaa9b965511009b59639', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': 'd8a01d27873e04bebd357dc87859aa756e0b28b2', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '110ccbd28c9444866fcc84ba96a2ad64fa6e95ae', 'versionType': 'git'}, {'status': 'affected', 'version': '1b43af5480c351dbcb2eef478bafe179cbeb6e83', 'lessThan': '9facb861dc6b9b9ea9793ef5032a9a826f7a4229', 'versionType': 'git'}], 'programFiles': ['net/ipv6/ip6_fib.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/ip6_fib.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: ipv6: fib6: fix NULL deref in fib6_walk_continue() on multi-batch dump inet6_dump_fib() saves its progress in cb->args[1] as a positional index within the current hash chain. Between batches, a concurrent fib6_new_table() can insert a new table at the chain head, shifting all existing entries. The saved index then lands on a different table, causing fib6_dump_table() to set w->root to the wrong table while w->node still points into the previous one. fib6_walk_continue() dereferences w->node->parent (NULL) and panics: BUG: kernel NULL pointer dereference, address: 0000000000000008 RIP: 0010:fib6_walk_continue+0x6e/0x170 Call Trace: <TASK> fib6_dump_table.isra.0+0xc5/0x240 inet6_dump_fib+0xf6/0x420 rtnl_dumpit+0x30/0xa0 netlink_dump+0x15b/0x460 netlink_recvmsg+0x1d6/0x2a0 ____sys_recvmsg+0x17a/0x190 Fix by storing tb->tb6_id in cb->args[1] instead of a positional index. On resume, skip entries until the id matches; a concurrent head-insert can never match the saved id, so the walker always resumes on the correct table. Added Reference https://git.kernel.org/stable/c/059efb48dd746518898faaa9b965511009b59639 Added Reference https://git.kernel.org/stable/c/110ccbd28c9444866fcc84ba96a2ad64fa6e95ae Added Reference https://git.kernel.org/stable/c/27210d433a8c5fe6bf7278a04bbaeb49a81d0290 Added Reference https://git.kernel.org/stable/c/89f9c5fee3c64c5cabc34e65599308fd3c879cf9 Added Reference https://git.kernel.org/stable/c/9facb861dc6b9b9ea9793ef5032a9a826f7a4229 Added Reference https://git.kernel.org/stable/c/d8a01d27873e04bebd357dc87859aa756e0b28b2