CVE-2026-98374
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)
tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack()
In the Linux kernel, the following vulnerability has been resolved: tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack() When tcp_send_synack() replaces the cloned SYN skb at the head of the retransmit queue with a copy, it frees the original with tcp_rtx_queue_unlink_and_free() and only repairs tp->highest_sack. tp->retransmit_skb_hint keeps pointing at the freed skbuff_fclone_cache object. The dangling hint is read in tcp_verify_retransmit_hint() and used as the root of the rbtree walk in tcp_xmit_retransmit_queue(). An unprivileged TFO client (sendmsg(MSG_FASTOPEN)) can arm the hint with an attacker-supplied ICMP fragmentation-needed message, after which a simultaneous open frees the armed SYN skb: BUG: KASAN: slab-use-after-free in tcp_mark_skb_lost (net/ipv4/tcp_input.c:1316) Read of size 4 at addr ffff88800604d928 by task swapper/1/0 Call Trace: tcp_mark_skb_lost (net/ipv4/tcp_input.c:1316) tcp_simple_retransmit (net/ipv4/tcp_input.c:3158) tcp_v4_err (net/ipv4/tcp_ipv4.c:587) Sync the hint to the copy.
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) |
|---|---|---|---|---|---|
| c31b70c9968fe9c4194d1b5d06d07596a3b680de | affected | git | fad6d429651e748365e93ca54645accc212f0018 | Unavailable | None listed |
| c31b70c9968fe9c4194d1b5d06d07596a3b680de | affected | git | c5b4da1f403a658c1c19766be2b426003ada419f | Unavailable | None listed |
| c31b70c9968fe9c4194d1b5d06d07596a3b680de | affected | git | 71d45049b0d631dfdbf3c65305f7fca676de023b | Unavailable | None listed |
| c31b70c9968fe9c4194d1b5d06d07596a3b680de | affected | git | e3ea71cb1408a013ed4e8a757b815f1a919324bd | Unavailable | None listed |
| c31b70c9968fe9c4194d1b5d06d07596a3b680de | affected | git | 631aa4cb45099f09e9385dd786bd291c6270bfc4 | Unavailable | None listed |
| c31b70c9968fe9c4194d1b5d06d07596a3b680de | affected | git | 0f87720c7e4bcab07c24888b3cf12bfe857bb90e | Unavailable | None listed |
| c31b70c9968fe9c4194d1b5d06d07596a3b680de | affected | git | fe99bbeee5c5dbd3abc30721a8079ced59649d97 | 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) |
|---|---|---|---|---|---|
| 5.11 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.11 | Unavailable | None listed |
| 5.15.222 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.189 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.158 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.112 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.55 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.9 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |