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CVE-2026-31518— esp: fix skb leak with espintcp and async crypto

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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espintcp与异步加密时skb泄漏，可能导致内存泄漏。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< aca3ad0c262f54a5b5c95dda80a48365997d1224 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 41aafca57de4a4c026701622bd4648f112a9edcd affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 4820847e036ff1035b01b69ad68dfc17e7028fe9 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 6a3ec6efbc4f90e0ccb2e71574f07351f19996f4 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< df6f995358dc1f3c42484f5cfe241d7bd3e1cd15 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 88d386243ed374ac969dabd3bbc1409a31d81818 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 6aa9841d917532d0f2d932d1ff2f3a94305aaf47 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2 affected
… +10 more rows
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I. Basic Information for CVE-2026-31518

Vulnerability Information
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Vulnerability Title
esp: fix skb leak with espintcp and async crypto
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: esp: fix skb leak with espintcp and async crypto When the TX queue for espintcp is full, esp_output_tail_tcp will return an error and not free the skb, because with synchronous crypto, the common xfrm output code will drop the packet for us. With async crypto (esp_output_done), we need to drop the skb when esp_output_tail_tcp returns an error.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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espintcp与异步加密时skb泄漏，可能导致内存泄漏。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 ~ aca3ad0c262f54a5b5c95dda80a48365997d1224 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-31518

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III. Intelligence Information for CVE-2026-31518

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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 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31518

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