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CVE-2026-97990

Linux: vdpa_sim_net: check TX pull result before RX copy

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.12%Chance of exploitation activity in the next 30 days, higher than 1% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1b803d382cde6d85755b363f22010208a04ba40aAlso 3af20238a09ca180d66623e3bed16b64e9975f39, 2bbf1c1f69991e28787e02b0a2f826289d5fc730 and 1 moreCVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 1b803d382cde6d85755b363f22010208a04ba40aLinuxCVE List
  • 3af20238a09ca180d66623e3bed16b64e9975f39LinuxCVE List
  • 2bbf1c1f69991e28787e02b0a2f826289d5fc730LinuxCVE List
  • 0d195797a80b77f2ec56718cd26d3ee65d0093e8LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

vdpa_sim_net: check TX pull result before RX copy

vringh_iov_pull_iotlb() returns a signed byte count. A failed TX pull is currently added to the unsigned byte counter and then passed as a size_t length to receive_filter() and vringh_iov_push_iotlb(). A negative error can therefore become a large length in the RX path.

Handle non-positive pull results before every length use. Count the TX error and complete the consumed TX descriptor with zero bytes.

I found this bug myself, though the patch was written with AI assistance.

Text from CVE List

Affected versions 12

  • Linuxaffected: cfe226892913a448e83e7a19db93862baa3cb99c before 1b803d382cde6d85755b363f22010208a04ba40aCVE List
  • Linuxaffected: cfe226892913a448e83e7a19db93862baa3cb99c before c001abcde865b74231da8f1412c3217dbf66781eCVE List
  • Linuxaffected: cfe226892913a448e83e7a19db93862baa3cb99c before 3af20238a09ca180d66623e3bed16b64e9975f39CVE List
  • Linuxaffected: cfe226892913a448e83e7a19db93862baa3cb99c before 2bbf1c1f69991e28787e02b0a2f826289d5fc730CVE List
  • Linuxaffected: cfe226892913a448e83e7a19db93862baa3cb99c before 0d195797a80b77f2ec56718cd26d3ee65d0093e8CVE List
  • Linuxaffected: 5.19CVE List
  • Linuxunaffected: all versions before 5.19CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5