CVE-2026-31665
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
netfilter: nft_ct: fix use-after-free in timeout object destroy
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: fix use-after-free in timeout object destroy nft_ct_timeout_obj_destroy() frees the timeout object with kfree() immediately after nf_ct_untimeout(), without waiting for an RCU grace period. Concurrent packet processing on other CPUs may still hold RCU-protected references to the timeout object obtained via rcu_dereference() in nf_ct_timeout_data(). Add an rcu_head to struct nf_ct_timeout and use kfree_rcu() to defer freeing until after an RCU grace period, matching the approach already used in nfnetlink_cttimeout.c. KASAN report: BUG: KASAN: slab-use-after-free in nf_conntrack_tcp_packet+0x1381/0x29d0 Read of size 4 at addr ffff8881035fe19c by task exploit/80 Call Trace: nf_conntrack_tcp_packet+0x1381/0x29d0 nf_conntrack_in+0x612/0x8b0 nf_hook_slow+0x70/0x100 __ip_local_out+0x1b2/0x210 tcp_sendmsg_locked+0x722/0x1580 __sys_sendto+0x2d8/0x320 Allocated by task 75: nft_ct_timeout_obj_init+0xf6/0x290 nft_obj_init+0x107/0x1b0 nf_tables_newobj+0x680/0x9c0 nfnetlink_rcv_batch+0xc29/0xe00 Freed by task 26: nft_obj_destroy+0x3f/0xa0 nf_tables_trans_destroy_work+0x51c/0x5c0 process_one_work+0x2c4/0x5a0
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | c458fc1c278a65ad5381083121d39a479973ebed | Unavailable | None listed |
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | c581e5c8f2b59158f62efe61c1a3dc36189081ff | Unavailable | None listed |
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | f16fe84879a5280f05ebbcea593a189ba0f3e79a | Unavailable | None listed |
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | 070abdf1b04325b21a20a2a0c39a2208af107275 | Unavailable | None listed |
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | aa7cfa16f98f8ec3e6d47c34e1a8c1ae4b9b8b77 | Unavailable | None listed |
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | b42aca3660dc2627a29a38131597ca610dc451f9 | Unavailable | None listed |
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | d0983b48c10d1509fd795c155f8b1e832e1369ff | Unavailable | None listed |
| 7e0b2b57f01d183e1c84114f1f2287737358d748 | affected | git | f8dca15a1b190787bbd03285304b569631160eda | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.19 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.19 | Unavailable | None listed |
| 5.10.253 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.203 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.169 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.135 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.82 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.23 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 6.19.13 | unaffected | semver | Unavailable | 6.19.* | None listed |
| 7.0 | unaffected | original_commit_for_fix | Unavailable | * | None listed |