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CVE-2026-99053

tipc: hold a reference to nodes found by link name

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:55:35 UTC
Linux · CVSS:3.1 · 7.8
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity

high7.8

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

The Linux kernel is vulnerable due to a use-after-free bug in the TIPC (Transparent Inter-Process Communication) protocol. This occurs when the `tipc_node_find_by_name` function returns a node after dropping its RCU read lock without taking a reference, allowing a race condition with timer-driven cleanup of a down peer. The impact of this vulnerability is not explicitly stated.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

8 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before 384edc67201f8561b7de952647b923f0524b1f36

git versions

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before 5b7e58e8be90f4e8530e7a60372d003dfa7fd666

git versions

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before 92f3b3368722631e933a4db0cf8bd578ed08cd9c

git versions

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before b60259d4047fbb735476c729dcf9306a038b6110

git versions

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before f17e70206a1e763fcca2578a8db3c4eed0f843a9

git versions

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before 1428c5f1d346a2e1ac9156713975a72246957009

git versions

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before 3c3b308ee6e25729a6cf09b69cdd0e093220d40b

git versions

6a939f365bdb03a74b4617bdb4402fc08da088b9 → before 17e73bae400f6a434dc006e3bee92c94cf781954

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

10 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.19

unaffected

0 → before 4.19

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.113 → through 6.12.*

semver versions

6.18.57 → through 6.18.*

semver versions

7.2.11 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

tipc: hold a reference to nodes found by link name

tipc_node_find_by_name() returns a node after dropping its RCU read lock without taking a reference. The LINK_SET, LINK_GET and LINK_RESET_STATS handlers then lock and access the node, racing with timer-driven cleanup of a down peer. Generic netlink serialization does not exclude the node timer.

The following interleaving can leave a handler using a freed node:

CPU 0: find the node under RCU and release the node read lock CPU 1: tipc_node_timeout() clears the links and unlinks the down node CPU 1: drop the list and timer references, queuing tipc_node_free() CPU 0: leave the RCU read-side critical section CPU 1: complete the grace period and free the node CPU 0: acquire the node lock through the stale pointer

LINK_SET also uses the node's media address after releasing the node lock, when passing queued packets to tipc_bearer_xmit().

KASAN on v7.3-rc5 reported:

BUG: KASAN: slab-use-after-free in _raw_read_lock_bh Write of size 4 at addr ffff88807e06f008 by task poc/92 Call Trace: _raw_read_lock_bh kernel/locking/spinlock.c:287 tipc_nl_node_set_link net/tipc/node.c:2475 genl_family_rcv_msg_doit net/netlink/genetlink.c:1114 genl_rcv_msg net/netlink/genetlink.c:1209 netlink_rcv_skb net/netlink/af_netlink.c:2575

Allocated by task 0: tipc_node_create net/tipc/node.c:539 tipc_node_check_dest net/tipc/node.c:1196 tipc_disc_rcv net/tipc/discover.c:252

Freed by task 92: kfree mm/slub.c:6801 rcu_core kernel/rcu/tree.c:2919

Last potentially related work creation: __call_rcu_common.constprop.0 kernel/rcu/tree.c:3181 tipc_node_timeout net/tipc/node.c:814

Acquire a reference to the selected node with kref_get_unless_zero() before leaving RCU, returning NULL if the node has already been released. Release that reference on every caller exit after the last node access, including transmission in LINK_SET. Keep the existing link lookup order and locking so concurrent link removal still takes the existing error paths.

References

8 sources
git.kernel.org/stable/c/384edc67201f8561b7de952647b923f0524b1f36
Source referenceLinux
git.kernel.org/stable/c/5b7e58e8be90f4e8530e7a60372d003dfa7fd666
Source referenceLinux
git.kernel.org/stable/c/92f3b3368722631e933a4db0cf8bd578ed08cd9c
Source referenceLinux
git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110
Source referenceLinux
git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9
Source referenceLinux
git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b
Source referenceLinux
git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99053

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.6.160

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.12.113

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.18.57

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 7.2.11

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 7.3

Applicability preview
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Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.