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CVE-2026-90049— net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()

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.

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy() skb_zerocopy() copies frags from @from into @to. On an skb_orphan_frags() failure it calls skb_tx_error(@from), a destructive

AI Predicted 5.5 Difficulty: Hard
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I. Basic Information for CVE-2026-90049

Vulnerability Information

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Vulnerability Title
net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy() skb_zerocopy() copies frags from @from into @to. On an skb_orphan_frags() failure it calls skb_tx_error(@from), a destructive operation on the source skb the copy helper does not own. That completes @from's zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, including the SKBFL_SHARED_FRAG page-ownership marker. Both callers already report the failure on their own drop path. nfnetlink_queue does it at nla_put_failure, and Open vSwitch does it in the flow-miss drop arm of ovs_dp_process_packet(), so nothing is lost by dropping it here. On Open vSwitch's OVS_ACTION_ATTR_USERSPACE path the skb is not freed on this error: do_execute_actions() ignores output_userspace()'s return value and, unless the upcall was the last action, keeps forwarding the same skb through the flow's remaining actions. The uarg is completed while that skb is still in flight, telling the producer its buffers are free, and SKBFL_SHARED_FRAG is cleared on an skb the rest of the stack still handles. That flag is what makes esp_input() call skb_cow_data() instead of decrypting in place, so a later local ESP delivery can decrypt over frags the skb does not own privately. Leave error reporting to the callers.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 36d5fe6a000790f56039afe26834265db0a3ad4c ~ 849bdb83123760a865bcb2970127f4c0b9423ba3 -
Linux Linux 3.14 -

II. Public POCs for CVE-2026-90049

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III. Intelligence Information for CVE-2026-90049

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Other References for CVE-2026-90049 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-89859 scsi: qla2xxx: Zero dport diagnostics buffer to avoid info leak
CVE-2026-89875 media: ti: vpe: quiesce overflow recovery before freeing streams
CVE-2026-89876 media: tda18250: fix possible integer overflow
CVE-2026-89874 media: v4l2-async: avoid deleting unlinked ASC entry on link error
CVE-2026-89872 media: v4l2-fwnode: Fix fwnode leak in v4l2_fwnode_parse_link
CVE-2026-89873 media: v4l2-ctrls: validate HEVC EXT SPS RPS counts
CVE-2026-89871 media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure
CVE-2026-89870 media: zoran: Avoid freeing a registered video_device twice
CVE-2026-89869 media: qcom: iris: use disable_irq() during power-off
CVE-2026-89868 media: chips-media: wave5: Add timeout while stop_streaming
CVE-2026-89867 media: chips-media: wave5: Defer job_finish() only when a DEC_PIC was queued
CVE-2026-89866 media: chips-media: wave5: Resume device before setting EOS flag
CVE-2026-89865 scsi: qla2xxx: Zero SFP DMA buffer in FRU/I2C bsg handlers
CVE-2026-89864 scsi: qla2xxx: Bound i2c->length in I2C bsg handlers
CVE-2026-89863 scsi: qla2xxx: edif: Fix NULL pointer deref in RX SA delete check
CVE-2026-89862 scsi: qla2xxx: Fix BSG job leak on validate flash image error path
CVE-2026-89861 scsi: qla2xxx: Hold vport reference in qla24xx_report_id_acquisition()
CVE-2026-89860 scsi: qla2xxx: Initialize NVMe abort_work once at submission
CVE-2026-89849 scsi: qla2xxx: Reject non-SCSI SRB on status IOCB fast path
CVE-2026-89847 scsi: qla2xxx: Avoid double completion in async IOCB timeout

Showing top 20 of 276 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90049

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