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CVE-2026-52940

In the Linux kernel, the following vulnerability has been resolved: tun: zero the whole vnet header in tun_put_user() tun_put_user() declares an on-stack struct virtio_net_hdr_v1_hash_tunnel without zeroing it. For a non-tunnel skb, virtio_net_hdr_tnl_from_skb() only initializes the first 10 bytes (sizeof(struct virtio_net_hdr)), leaving bytes 10..23 (num_buffers and the hash/tunnel fields) as stack garbage. An unprivileged user can set the vnet header size to 24 with TUNSETVNETHDRSZ, so __tu
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f79a05751544a188d3e494f3e0647e86ee304ce4fb2f4774e801e0866e3a8e60
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/tun.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3f49a0969e01ece939024957b810002a8e8dbf8e2dc87b97fd7a18b74923a44 · sha256:e3d505f44fc3cebb… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/tun.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5fd1fa5a4254bfdd70571c77f5e3bcb4e43738d5","status":"affected","version":"288f30435132d2f9e7a29ec9b9745a4f9dc7fd37","versionType":"git"},{"lessThan":"585cb85e9a29185be05f326369573c2663cf4380","status":"affected","version":"288f30435132d2f9e7a29ec9b9745a4f9dc7fd37","versionType":"git"},{"lessThan":"7f2fcff15e99bb852f6967396ed12b38376e2c8d","status":"affected","version":"288f30435132d2f9e7a29ec9b974…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3f49a0969e01ece939024957b810002a8e8dbf8e2dc87b97fd7a18b74923a44 · sha256:e3d505f44fc3cebb… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/tun.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3f49a0969e01ece939024957b810002a8e8dbf8e2dc87b97fd7a18b74923a44 · sha256:e3d505f44fc3cebb… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/tun.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5fd1fa5a4254bfdd70571c77f5e3bcb4e43738d5","status":"affected","version":"288f30435132d2f9e7a29ec9b9745a4f9dc7fd37","versionType":"git"},{"lessThan":"585cb85e9a29185be05f326369573c2663cf4380","status":"affected","version":"288f30435132d2f9e7a29ec9b9745a4f9dc7fd37","versionType":"git"},{"lessThan":"7f2fcff15e99bb852f6967396ed12b38376e2c8d","status":"affected","version":"288f30435132d2f9e7a29ec9b974…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e3f49a0969e01ece939024957b810002a8e8dbf8e2dc87b97fd7a18b74923a44 · sha256:e3d505f44fc3cebb… · /containers/cna/affected/0

Source references

3 source assertions
{"url":"https://git.kernel.org/stable/c/585cb85e9a29185be05f326369573c2663cf4380"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3f49a0969e01ece939024957b810002a8e8dbf8e2dc87b97fd7a18b74923a44 · sha256:e3d505f44fc3cebb… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/5fd1fa5a4254bfdd70571c77f5e3bcb4e43738d5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3f49a0969e01ece939024957b810002a8e8dbf8e2dc87b97fd7a18b74923a44 · sha256:e3d505f44fc3cebb… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/7f2fcff15e99bb852f6967396ed12b38376e2c8d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e3f49a0969e01ece939024957b810002a8e8dbf8e2dc87b97fd7a18b74923a44 · sha256:e3d505f44fc3cebb… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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