CVE-2021-47397sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb
- 7.5HighCVSS base score
- 0.78%Exploitation in 30 daysEPSS · top 44% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb We should always check if skb_header_pointer's return is NULL before using it, otherwise it may cause null-ptr-deref, as syzbot reported: KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [inline] RIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input.c:196 Call Trace: <IRQ> sctp6_rcv+0x38/0x60 net/sctp/ipv6.c:1109 ip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422 ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472 dst_input include/net/dst.h:460 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.78% · top 44% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f – < 77bc7dcf0fcc1519341a91788d7a2914fcfddf6d
- affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f – < 8c630a7b4f9dec63f08bd881ab77984a724a5124
- affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f – < ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1
- affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f – < 9c6591ae8e63f93c895ad5e2703c36c548aac997
- affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f – < 8180611c238e11676612eb2a9828b1c7a3a4d77b
- affected 3acb50c18d8d6650f10919464ade4dcdaf41d62f – < f7e745f8e94492a8ac0b0a26e25f2b19d342918f
- affected 4.8
- unaffected < 4.8
- unaffected 4.14.249 – ≤ 4.14.*
- unaffected 4.19.209 – ≤ 4.19.*
- unaffected 5.4.151 – ≤ 5.4.*
- unaffected 5.10.71 – ≤ 5.10.*
- unaffected 5.14.10 – ≤ 5.14.*
- unaffected 5.15 – ≤ *
References
References6
- https://git.kernel.org/stable/c/77bc7dcf0fcc1519341a91788d7a2914fcfddf6d (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/8c630a7b4f9dec63f08bd881ab77984a724a5124 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/ec018021cf445abbe8e2f3e2a7f1dcc813cb8ea1 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/9c6591ae8e63f93c895ad5e2703c36c548aac997 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/8180611c238e11676612eb2a9828b1c7a3a4d77b (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/f7e745f8e94492a8ac0b0a26e25f2b19d342918f (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-34402 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-47397)Record last updated .