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CVE-2024-49948

net: add more sanity checks to qdisc_pkt_len_init()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.323, 5.4.285, 5.10.227, 5.15.168, 6.1.113, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: net: add more sanity checks to qdisc_pkt_len_init() One path takes care of SKB_GSO_DODGY, assuming skb->len is bigger than hdr_len. virtio_net_hdr_to_skb() does not fully dissect TCP headers, it only make sure it is at least 20 bytes. It is possible for an user to provide a malicious 'GSO' packet, total length of 80 bytes. • 20 bytes of IPv4 header • 60 bytes TCP header • a small gso_size like 8 virtio_net_hdr_to_skb() would declare this packet as a normal GSO packet, because it would see 40 bytes of payload, bigger than gso_size. We need to make detect this case to not underflow qdisc_skb_cb(skb)->pkt_len.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in d7d1a28f5dd57b4d83def876f8d7b4403bd37df9; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in 473426a1d53a68dd1e718e6cd00d57936993fa6c; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in 566a931a1436d0e0ad13708ea55479b95426213c; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in 2415f465730e48b6e38da1c7c097317bf5dd2d20; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in 27a8fabc54d2f960d47bdfbebf2bdc6e8a92a4c4; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in 9b0ee571d20a238a22722126abdfde61f1b2bdd0; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in ff1c3cadcf405ab37dd91418a62a7acecf3bc5e2; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in 1eebe602a8d8264a12e35e39d0645fa88dbbacdd; From 1def9238d4aa2146924994aa4b7dc861f03b9362 · fixed in ab9a9a9e9647392a19e7a885b08000e89c86b535

  • Linux Linux

    3.9

  • KernelLinux

    From 3.9.0 · fixed in 4.19.323; From 4.20.0 · fixed in 5.4.285; From 5.5.0 · fixed in 5.10.227; From 5.11.0 · fixed in 5.15.168; From 5.16.0 · fixed in 6.1.113; From 6.2.0 · fixed in 6.6.55; From 6.7.0 · fixed in 6.10.14; From 6.11.0 · fixed in 6.11.3

References 9

git.kernel.org