CVE-2026-31517— xfrm: iptfs: fix skb_put() panic on non-linear skb during reassembly
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I. Basic Information for CVE-2026-31517
Vulnerability Information
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Vulnerability Title
xfrm: iptfs: fix skb_put() panic on non-linear skb during reassembly
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: fix skb_put() panic on non-linear skb during reassembly In iptfs_reassem_cont(), IP-TFS attempts to append data to the new inner packet 'newskb' that is being reassembled. First a zero-copy approach is tried if it succeeds then newskb becomes non-linear. When a subsequent fragment in the same datagram does not meet the fast-path conditions, a memory copy is performed. It calls skb_put() to append the data and as newskb is non-linear it triggers SKB_LINEAR_ASSERT check. Oops: invalid opcode: 0000 [#1] SMP NOPTI [...] RIP: 0010:skb_put+0x3c/0x40 [...] Call Trace: <IRQ> iptfs_reassem_cont+0x1ab/0x5e0 [xfrm_iptfs] iptfs_input_ordered+0x2af/0x380 [xfrm_iptfs] iptfs_input+0x122/0x3e0 [xfrm_iptfs] xfrm_input+0x91e/0x1a50 xfrm4_esp_rcv+0x3a/0x110 ip_protocol_deliver_rcu+0x1d7/0x1f0 ip_local_deliver_finish+0xbe/0x1e0 __netif_receive_skb_core.constprop.0+0xb56/0x1120 __netif_receive_skb_list_core+0x133/0x2b0 netif_receive_skb_list_internal+0x1ff/0x3f0 napi_complete_done+0x81/0x220 virtnet_poll+0x9d6/0x116e [virtio_net] __napi_poll.constprop.0+0x2b/0x270 net_rx_action+0x162/0x360 handle_softirqs+0xdc/0x510 __irq_exit_rcu+0xe7/0x110 irq_exit_rcu+0xe/0x20 common_interrupt+0x85/0xa0 </IRQ> <TASK> Fix this by checking if the skb is non-linear. If it is, linearize it by calling skb_linearize(). As the initial allocation of newskb originally reserved enough tailroom for the entire reassembled packet we do not need to check if we have enough tailroom or extend it.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于iptfs在重组期间对非线性skb调用skb_put，可能导致内核恐慌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-31517
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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total
| CVE-2026-31463 | 9.8 CRITICAL | iomap: fix invalid folio access when i_blkbits differs from I/O granularity |
| CVE-2026-31444 | 9.8 CRITICAL | ksmbd: fix use-after-free and NULL deref in smb_grant_oplock() |
| CVE-2026-31501 | 9.8 CRITICAL | net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path |
| CVE-2026-31436 | 9.8 CRITICAL | dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc() |
| CVE-2026-31478 | 9.8 CRITICAL | ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len() |
| CVE-2026-31448 | 9.4 CRITICAL | ext4: avoid infinite loops caused by residual data |
| CVE-2026-31450 | 8.8 HIGH | ext4: publish jinode after initialization |
| CVE-2026-31432 | 8.8 HIGH | ksmbd: fix OOB write in QUERY_INFO for compound requests |
| CVE-2026-31433 | 8.8 HIGH | ksmbd: fix potencial OOB in get_file_all_info() for compound requests |
| CVE-2026-31435 | 8.8 HIGH | netfs: Fix read abandonment during retry |
| CVE-2026-31476 | 8.2 HIGH | ksmbd: do not expire session on binding failure |
| CVE-2026-31464 | 8.1 HIGH | scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() |
| CVE-2026-31513 | 8.1 HIGH | Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req |
| CVE-2026-31446 | 7.8 HIGH | ext4: fix use-after-free in update_super_work when racing with umount |
| CVE-2026-31449 | 7.8 HIGH | ext4: validate p_idx bounds in ext4_ext_correct_indexes |
| CVE-2026-31502 | 7.8 HIGH | team: fix header_ops type confusion with non-Ethernet ports |
| CVE-2026-31431 | 7.8 HIGH | crypto: algif_aead - Revert to operating out-of-place |
| CVE-2026-31488 | 7.8 HIGH | drm/amd/display: Do not skip unrelated mode changes in DSC validation |
| CVE-2026-31490 | 7.8 HIGH | drm/xe/pf: Fix use-after-free in migration restore |
| CVE-2026-31454 | 7.8 HIGH | xfs: save ailp before dropping the AIL lock in push callbacks |
Showing top 20 of 100 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-31517
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