CVE-2026-68117
tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
Description
In the Linux kernel, the following vulnerability has been resolved: tipc: clear sock->sk on the failed-insert path in tipc_sk_create() When tipc_sk_create() fails to insert the new socket (tipc_sk_insert() returns non-zero), its error path frees the sk with sk_free() but leaves sock->sk pointing at the freed object: if (tipc_sk_insert(tsk)) { sk_free(sk); pr_warn("Socket create failed; port number exhausted\n"); return -EINVAL; } This is harmless for plain socket(): the syscall layer clears sock->ops before releasing, so tipc_release() is never called. It is not harmless on the accept() path. tipc_accept() creates the pre-allocated child socket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves new_sock->sk dangling and new_sock->ops non-NULL, and do_accept() then fput()s the new file, so __sock_release() -> tipc_release() runs lock_sock(new_sock->sk) on the freed sk -- a use-after-free write of the sk_lock spinlock. tipc_release() already guards this exact "failed accept() releases a pre-allocated child" case with "if (sk == NULL) return 0;", but the guard is bypassed because tipc_sk_create() left sock->sk non-NULL (dangling) rather than NULL. Clear sock->sk on the failed-insert path so the existing tipc_release() NULL check fires and the use-after-free is avoided. The tipc_sk_insert() failure is reached when the per-netns socket rhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M elements) -- i.e. once a netns holds ~2M TIPC sockets every insert returns -E2BIG. BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839) Write of size 8 at addr ffff8880047cdc38 by task init/1 lock_sock_nested (net/core/sock.c:3839) tipc_release (net/tipc/socket.c:638) __sock_release (net/socket.c:710) sock_close (net/socket.c:1501) __fput (fs/file_table.c:512) Allocated by task 1: sk_alloc (net/core/sock.c:2308) tipc_sk_create (net/tipc/socket.c:487) tipc_accept (net/tipc/socket.c:2744) do_accept (net/socket.c:2034) Freed by task 1: __sk_destruct (net/core/sock.c:2391) tipc_sk_create (net/tipc/socket.c:504) tipc_accept (net/tipc/socket.c:2744) do_accept (net/socket.c:2034)
INFO
Published Date :
Aug. 10, 2026, 1:19 p.m.
Last Modified :
Aug. 17, 2026, 5:18 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Set sock->sk to NULL on failed insert.
- Review socket creation and release logic.
- Apply kernel patches for TIPC module.
- Test socket operations after patch.
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-2026-68117.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68117 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-2026-68117
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-2026-68117 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68117 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': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'b07d87b31631edb6529e6cdcca790a7489d1250d', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': '5f5a41a48dbf9eda57b67ce23e548602cf7195a6', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'f9596b1566616a8be0592dbceccb6344a7c6f6bb', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'ba0533fc163f905fe817cfabdf8ed4058da44800', 'versionType': 'git'}, {'status': 'affected', 'version': '638fa20b618b2bbcf86da71231624cc82121a036', 'versionType': 'git'}, {'status': 'affected', 'version': '7bc9e7f70bc57d8f02ffea2a42094281effb15ef', 'versionType': 'git'}, {'status': 'affected', 'version': 'ef488669b2652bde5b6ee5a409a5b048a2a50db4', 'versionType': 'git'}, {'status': 'affected', 'version': '4919d82f7041157a421ca9bf39a78551d5ad8a1b', 'versionType': 'git'}, {'status': 'affected', 'version': 'efa78f2ae363428525fb4981bb63c555ee79f3c7', 'versionType': 'git'}, {'status': 'affected', 'version': '833ecd0eae76eadf81d6d747bb5bc992d1151867', 'versionType': 'git'}, {'status': 'affected', 'version': '3b2957fc09fe1ac7f07f40dd50dd5f93e3f3a7a2', 'versionType': 'git'}, {'status': 'affected', 'version': '4.9.324', 'lessThan': '4.10', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.14.289', 'lessThan': '4.15', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.19.253', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.4.207', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.10.132', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.56', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.18.13', 'lessThan': '5.19', 'versionType': 'semver'}], 'programFiles': ['net/tipc/socket.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/tipc/socket.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'b07d87b31631edb6529e6cdcca790a7489d1250d', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': '5f5a41a48dbf9eda57b67ce23e548602cf7195a6', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'f9596b1566616a8be0592dbceccb6344a7c6f6bb', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'ba0533fc163f905fe817cfabdf8ed4058da44800', 'versionType': 'git'}, {'status': 'affected', 'version': '638fa20b618b2bbcf86da71231624cc82121a036', 'versionType': 'git'}, {'status': 'affected', 'version': '7bc9e7f70bc57d8f02ffea2a42094281effb15ef', 'versionType': 'git'}, {'status': 'affected', 'version': 'ef488669b2652bde5b6ee5a409a5b048a2a50db4', 'versionType': 'git'}, {'status': 'affected', 'version': '4919d82f7041157a421ca9bf39a78551d5ad8a1b', 'versionType': 'git'}, {'status': 'affected', 'version': 'efa78f2ae363428525fb4981bb63c555ee79f3c7', 'versionType': 'git'}, {'status': 'affected', 'version': '833ecd0eae76eadf81d6d747bb5bc992d1151867', 'versionType': 'git'}, {'status': 'affected', 'version': '3b2957fc09fe1ac7f07f40dd50dd5f93e3f3a7a2', 'versionType': 'git'}, {'status': 'affected', 'version': '4.9.324', 'lessThan': '4.10', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.14.289', 'lessThan': '4.15', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.19.253', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.4.207', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.10.132', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.56', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.18.13', 'lessThan': '5.19', 'versionType': 'semver'}], 'programFiles': ['net/tipc/socket.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/tipc/socket.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 13, 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 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 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': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'b07d87b31631edb6529e6cdcca790a7489d1250d', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': '5f5a41a48dbf9eda57b67ce23e548602cf7195a6', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'f9596b1566616a8be0592dbceccb6344a7c6f6bb', 'versionType': 'git'}, {'status': 'affected', 'version': '00aff3590fc0a73bddd3b743863c14e76fd35c0c', 'lessThan': 'ba0533fc163f905fe817cfabdf8ed4058da44800', 'versionType': 'git'}, {'status': 'affected', 'version': '638fa20b618b2bbcf86da71231624cc82121a036', 'versionType': 'git'}, {'status': 'affected', 'version': '7bc9e7f70bc57d8f02ffea2a42094281effb15ef', 'versionType': 'git'}, {'status': 'affected', 'version': 'ef488669b2652bde5b6ee5a409a5b048a2a50db4', 'versionType': 'git'}, {'status': 'affected', 'version': '4919d82f7041157a421ca9bf39a78551d5ad8a1b', 'versionType': 'git'}, {'status': 'affected', 'version': 'efa78f2ae363428525fb4981bb63c555ee79f3c7', 'versionType': 'git'}, {'status': 'affected', 'version': '833ecd0eae76eadf81d6d747bb5bc992d1151867', 'versionType': 'git'}, {'status': 'affected', 'version': '3b2957fc09fe1ac7f07f40dd50dd5f93e3f3a7a2', 'versionType': 'git'}, {'status': 'affected', 'version': '4.9.324', 'lessThan': '4.10', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.14.289', 'lessThan': '4.15', 'versionType': 'semver'}, {'status': 'affected', 'version': '4.19.253', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.4.207', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.10.132', 'lessThan': '5.11', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.15.56', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.18.13', 'lessThan': '5.19', 'versionType': 'semver'}], 'programFiles': ['net/tipc/socket.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/tipc/socket.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: tipc: clear sock->sk on the failed-insert path in tipc_sk_create() When tipc_sk_create() fails to insert the new socket (tipc_sk_insert() returns non-zero), its error path frees the sk with sk_free() but leaves sock->sk pointing at the freed object: if (tipc_sk_insert(tsk)) { sk_free(sk); pr_warn("Socket create failed; port number exhausted\n"); return -EINVAL; } This is harmless for plain socket(): the syscall layer clears sock->ops before releasing, so tipc_release() is never called. It is not harmless on the accept() path. tipc_accept() creates the pre-allocated child socket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves new_sock->sk dangling and new_sock->ops non-NULL, and do_accept() then fput()s the new file, so __sock_release() -> tipc_release() runs lock_sock(new_sock->sk) on the freed sk -- a use-after-free write of the sk_lock spinlock. tipc_release() already guards this exact "failed accept() releases a pre-allocated child" case with "if (sk == NULL) return 0;", but the guard is bypassed because tipc_sk_create() left sock->sk non-NULL (dangling) rather than NULL. Clear sock->sk on the failed-insert path so the existing tipc_release() NULL check fires and the use-after-free is avoided. The tipc_sk_insert() failure is reached when the per-netns socket rhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M elements) -- i.e. once a netns holds ~2M TIPC sockets every insert returns -E2BIG. BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839) Write of size 8 at addr ffff8880047cdc38 by task init/1 lock_sock_nested (net/core/sock.c:3839) tipc_release (net/tipc/socket.c:638) __sock_release (net/socket.c:710) sock_close (net/socket.c:1501) __fput (fs/file_table.c:512) Allocated by task 1: sk_alloc (net/core/sock.c:2308) tipc_sk_create (net/tipc/socket.c:487) tipc_accept (net/tipc/socket.c:2744) do_accept (net/socket.c:2034) Freed by task 1: __sk_destruct (net/core/sock.c:2391) tipc_sk_create (net/tipc/socket.c:504) tipc_accept (net/tipc/socket.c:2744) do_accept (net/socket.c:2034) Added Reference https://git.kernel.org/stable/c/5f5a41a48dbf9eda57b67ce23e548602cf7195a6 Added Reference https://git.kernel.org/stable/c/b07d87b31631edb6529e6cdcca790a7489d1250d Added Reference https://git.kernel.org/stable/c/ba0533fc163f905fe817cfabdf8ed4058da44800 Added Reference https://git.kernel.org/stable/c/dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea Added Reference https://git.kernel.org/stable/c/f9596b1566616a8be0592dbceccb6344a7c6f6bb