CVE-2025-37749 (GCVE-0-2025-37749)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:55 – Updated: 2025-11-03 19:54
VLAI?
Title
net: ppp: Add bound checking for skb data on ppp_sync_txmung
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ppp: Add bound checking for skb data on ppp_sync_txmung Ensure we have enough data in linear buffer from skb before accessing initial bytes. This prevents potential out-of-bounds accesses when processing short packets. When ppp_sync_txmung receives an incoming package with an empty payload: (remote) gef➤ p *(struct pppoe_hdr *) (skb->head + skb->network_header) $18 = { type = 0x1, ver = 0x1, code = 0x0, sid = 0x2, length = 0x0, tag = 0xffff8880371cdb96 } from the skb struct (trimmed) tail = 0x16, end = 0x140, head = 0xffff88803346f400 "4", data = 0xffff88803346f416 ":\377", truesize = 0x380, len = 0x0, data_len = 0x0, mac_len = 0xe, hdr_len = 0x0, it is not safe to access data[2]. [pabeni@redhat.com: fixed subj typo]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 529401c8f12ecc35f9ea5d946d5a5596cf172b48 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < de5a4f0cba58625e88b7bebd88f780c8c0150997 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 99aa698dec342a07125d733e39aab4394b3b7e05 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b4c836d33ca888695b2f2665f948bc1b34fbd533 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1f6eb9fa87a781d5370c0de7794ae242f1a95ee5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aabc6596ffb377c4c9c8f335124b92ea282c9821 (git)
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    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.293 , ≤ 5.4.* (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.24 , ≤ 6.12.* (semver)
Unaffected: 6.13.12 , ≤ 6.13.* (semver)
Unaffected: 6.14.3 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ppp: Add bound checking for skb data on ppp_sync_txmung\n\nEnsure we have enough data in linear buffer from skb before accessing\ninitial bytes. This prevents potential out-of-bounds accesses\nwhen processing short packets.\n\nWhen ppp_sync_txmung receives an incoming package with an empty\npayload:\n(remote) gef\u27a4  p *(struct pppoe_hdr *) (skb-\u003ehead + skb-\u003enetwork_header)\n$18 = {\n\ttype = 0x1,\n\tver = 0x1,\n\tcode = 0x0,\n\tsid = 0x2,\n        length = 0x0,\n\ttag = 0xffff8880371cdb96\n}\n\nfrom the skb struct (trimmed)\n      tail = 0x16,\n      end = 0x140,\n      head = 0xffff88803346f400 \"4\",\n      data = 0xffff88803346f416 \":\\377\",\n      truesize = 0x380,\n      len = 0x0,\n      data_len = 0x0,\n      mac_len = 0xe,\n      hdr_len = 0x0,\n\nit is not safe to access data[2].\n\n[pabeni@redhat.com: fixed subj typo]"
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        {
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    "cveId": "CVE-2025-37749",
    "datePublished": "2025-05-01T12:55:55.316Z",
    "dateReserved": "2025-04-16T04:51:23.937Z",
    "dateUpdated": "2025-11-03T19:54:24.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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